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BEGIN:VEVENT
SUMMARY:PanScales: next-generation parton showers
DTSTART;VALUE=DATE-TIME:20231026T153000Z
DTEND;VALUE=DATE-TIME:20231026T160000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-375@indico.fis.ucm.es
DESCRIPTION:Speakers: Alba Soto Ontoso ()\nIn this talk I will give an ove
rview of the latest developments on parton-showers within the PanScales fr
amework. First\, I will discuss the criteria that a parton shower needs to
meet from a logarithmic resummation perspective. Then\, I will introduce
the next-to-leading logarithmic accurate PanScales showers for different c
ollision systems: e+e-\, DIS and colour singlet production in pp. Finally\
, I will comment on the challenges and first steps towards building parton
showers an order higher in precision. This next-to-next-to-leading logari
thmic accuracy will be fundamental in order to meet the expected precision
of experimental analyses both at HL-LHC and FCC.\n\nhttps://indico.fis.uc
m.es/event/19/contributions/375/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/375/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hidden soft effects from TMD Fragmentation Functions extractions
DTSTART;VALUE=DATE-TIME:20231026T143000Z
DTEND;VALUE=DATE-TIME:20231026T150000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-383@indico.fis.ucm.es
DESCRIPTION:Speakers: Andrea Simonelli (Jefferson Lab and ODU)\nTransverse
Momentum Dependent (TMD) factorization leads to well established theorems
for a restricted class of processes. In such cases\, some of the effects
produced by the soft radiation cancel out and the physics associated to th
em cannot be accessed. Extension of the factorization to non-standard proc
esses inevitably leads to deal with the non trivial structure of the soft
sector\, revealing details that in the standard cases are not accessible.
In particular\, comparing the extraction of the TMD Fragmentation Function
obtained from SIDIS with that extracted from single-inclusive $e^+e^-$ an
nihilation gives access to a new universal non-perturbative function descr
ibing the long-distance behavior of soft gluons and potentially revealing
hidden properties of the QCD vacuum. In this talk\, I present such compari
son among the most recent phenomenological extractions and I will provide
the first quantitative estimate of these hidden soft effects.\n\nhttps://i
ndico.fis.ucm.es/event/19/contributions/383/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/383/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quarkonium production cross sections at high energy in the matchin
g approach
DTSTART;VALUE=DATE-TIME:20231025T100500Z
DTEND;VALUE=DATE-TIME:20231025T103000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-407@indico.fis.ucm.es
DESCRIPTION:Speakers: Maxim Nefedov ()\nTBA\n\nhttps://indico.fis.ucm.es/e
vent/19/contributions/407/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/407/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diffractive single and di-hadron production as testified of gluoni
c saturation
DTSTART;VALUE=DATE-TIME:20231024T090000Z
DTEND;VALUE=DATE-TIME:20231024T093000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-385@indico.fis.ucm.es
DESCRIPTION:Speakers: Michael Fucilla (Université Paris-Saclay\, CNRS/IN2
P3\, IJCLab\, 91405\, Orsay\, France)\nOne of the most intriguing phenomen
a of strong interaction is the so-called gluon saturation in nucleons and
nuclei at very small value of the Bjorken-$x$. In the saturation regime\,
the density of partons\, per unit of transverse area\, in hadronic wavefun
ctions becomes very large leading to non-linear effects. These latter stop
the strong growth of the gluon density at small-$x$ leading to a state ch
aracterized by a balancing of gluon emissions and recombinations. \n\nWith
the aim of obtaining accurate theoretical predictions to test the physics
of saturation\, we calculate\, at next-to-leading logarithmic accuracy\,
the cross-sections of diffractive single and di-hadron photo- or electropr
oduction with large $p_T$\, on a nucleon or a nucleus. These new processes
can be investigated at both the EIC\, or\, at the LHC in $p A$ and $A A$
scattering\, using Ultra Peripheral Collisions (UPC).\n\nhttps://indico.fi
s.ucm.es/event/19/contributions/385/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/385/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Automatic Computation of the Soft Anomalous Dimension Matrices for
the Heavy-Quark Hadroproduction
DTSTART;VALUE=DATE-TIME:20231025T094000Z
DTEND;VALUE=DATE-TIME:20231025T100500Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-403@indico.fis.ucm.es
DESCRIPTION:Speakers: Bakar Chargeishvili (University of Hamburg)\nIn this
work we present the tools developed for the automatization of the calcula
tion of the soft anomalous dimension matrices for the heavy-quark hadropro
duction processes at one- and two-loop accuracy in QCD. The foundation of
this procedure is the construction of orthogonal color basis for $2 \\righ
tarrow n$ processes which will also be discussed. The application of these
tools is demonstrated on the examples of $t\\bar t j$ and $t\\bar t t \\b
ar t$ hadroproductions\, making a step forward towards implementing a proc
edure for the resummation of soft-gluon emission logarithms for these proc
esses.\n\nhttps://indico.fis.ucm.es/event/19/contributions/403/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/403/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Bayesian inference for PDFs
DTSTART;VALUE=DATE-TIME:20231024T130000Z
DTEND;VALUE=DATE-TIME:20231024T133000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-372@indico.fis.ucm.es
DESCRIPTION:Speakers: Tommaso Giani (Nikhef)\nThe determination of Parton
Distribution Functions (PDFs) is an example of inverse problem: a model is
sought knowing a finite set of experimental observations. Given the fact
that the model is a continuous function\, i.e. an element of an infinite d
imensional space\, its determination from a discrete set of data is notori
ously a ill-posed problem. In the currently used methodologies for PDF det
ermination\, the model is parameterized in terms of a finite (albeit large
) set of parameters\, which are then fitted to the observed data. This pro
cedure\, known as parametric regression\, reduces the problem to a finite
dimensional and solvable one\, but generally it has the drawback of introd
ucing some bias. \nA Bayesian approach provides a suitable alternative to
address inverse problems\, avoiding the need to introduce a finite-dimensi
onal parameterization and recasting the problem in a probabilistic languag
e. I will discuss a Bayesian methodology for the determination of PDFs\, p
roviding examples for the determination of PDFs from Deep Inelastic Scatte
ring data and from lattice matrix elements.\n\nhttps://indico.fis.ucm.es/e
vent/19/contributions/372/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/372/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Factorization of Non-Global LHC Observables and Resummation of Sup
er-Leading Logarithms
DTSTART;VALUE=DATE-TIME:20231026T130000Z
DTEND;VALUE=DATE-TIME:20231026T133000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-380@indico.fis.ucm.es
DESCRIPTION:Speakers: Matthias Neubert (Mainz University)\nWe present a sy
stematic formalism based on a factorization theorem in soft-collinear effe
ctive theory to describe non-global observables at hadron colliders\, such
as gap-between-jets cross sections. The cross sections are factorized int
o convolutions of hard functions\, capturing the dependence on the partoni
c center-of-mass energy $\\sqrt{\\hat s}$\, and low-energy matrix elements
\, which are sensitive to the low scale $Q_0\\ll\\sqrt{\\hat s}$ character
istic of the veto imposed on energetic emissions into the gap between the
jets. The scale evolution of both objects is governed by a renormalization
-group equation\, which we derive at one-loop order. By solving the evolut
ion equation for the hard functions for arbitrary $2\\to M$ jet processes
in the leading logarithmic approximation\, we accomplish for the first tim
e the all-order resummation of the so-called ``super-leading logarithms''
discovered in 2006\, thereby solving an old problem of quantum field theor
y. We study the numerical size of the corresponding effects for different
partonic scattering processes and explain why they are sizable for $pp\\to
2\\\,\\text{jets}$ processes\, but suppressed in $H/Z$ and $H/Z$\\\,+\\\,
jet production. The super-leading logarithms are given by an alternating s
eries\, whose individual terms can be much larger than the resummed result
\, even in very high orders of the loop expansion. Resummation is therefor
e essential to control these effects. We find that the asymptotic fall-off
of the resummed series is much weaker than for standard Sudakov form fact
ors.\n\nhttps://indico.fis.ucm.es/event/19/contributions/380/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/380/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Current status and recent improvements in the Geneva event generat
or
DTSTART;VALUE=DATE-TIME:20231027T100000Z
DTEND;VALUE=DATE-TIME:20231027T103000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-367@indico.fis.ucm.es
DESCRIPTION:Speakers: Georgios Billis (University of Milan Bicocca & INFN
Milan Bicocca)\nGeneva is a Monte Carlo event generator that matches fixed
-order NNLO predictions with higher-order (NNLL') resummation in the jet r
esolution variable (zero-jettiness)\, and further combines them with parto
n showers. In this talk\, I will first discuss recent improvements in the
Geneva framework and demonstrate their impact in selected color-singlet pr
ocesses. Furthermore\, I will present results for the resummation of one-j
ettiness resolution variable\, which is relevant for the production of a c
olor-singlet state (V) together with a hard jet (j). These results constit
ute an indispensable ingredient and the first steps towards the complete c
onstruction of a V+j event generator such as Geneva.\n\nhttps://indico.fis
.ucm.es/event/19/contributions/367/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/367/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High-energy heavy-ion collisions and underlying QCD phenomena
DTSTART;VALUE=DATE-TIME:20231025T120000Z
DTEND;VALUE=DATE-TIME:20231025T123000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-410@indico.fis.ucm.es
DESCRIPTION:Speakers: Francois Gelis (Saclay)\nIn this talk\, I will prese
nt an overview of heavy ion collisions. In particular\, I will introduce t
he main phenomena in these collisions\, and discuss them from the point of
view of QCD\, in order to highlight some of the possible approaches to ta
ckle situations where collective phenomena play a crucial role.\n\nhttps:/
/indico.fis.ucm.es/event/19/contributions/410/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/410/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse $\\Lambda$ polarization in $e^+e^−$ annihilation and
SIDIS processes within a TMD approach
DTSTART;VALUE=DATE-TIME:20231025T150000Z
DTEND;VALUE=DATE-TIME:20231025T153000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-397@indico.fis.ucm.es
DESCRIPTION:Speakers: Umberto D'Alesio (University and INFN Cagliari)\nWe
present an updated analysis of Belle data for the transverse $\\Lambda$ po
larization in $e^+e^−$ annihilation processes within a TMD factorization
approach. Special attention to $SU(2)$ isospin symmetry and charm quark c
ontribution will be paid\, both concerning the description of the experime
ntal data and the extraction of the polarizing fragmentation functions.\nP
redictions for SIDIS processes at typical energies of the future EIC will
be presented.\n\nhttps://indico.fis.ucm.es/event/19/contributions/397/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/397/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Associated production of heavy quarkonia and D mesons in the high-
energy factorization
DTSTART;VALUE=DATE-TIME:20231025T075500Z
DTEND;VALUE=DATE-TIME:20231025T082000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-370@indico.fis.ucm.es
DESCRIPTION:Speakers: Vladimir Saleev (Samara University)\nWe study associ
ated production of heavy quarkonia and D mesons in the improved color evap
oration model using the high-energy factorization as it is formulated in t
he parton Reggeization approach. The last one is based on the modified Kim
ber-Martin-Ryskin-Watt model for unintegrated parton distribution function
s and the effective field theory of Reggezied gluons and quarks\, suggeste
d by L.N. Lipatov. We predict cross section for associated J/ψ or Υ and
D hadroproduction via the single and double parton scattering mechanisms u
sing the set of model parameters which have been obtained early for the de
scription of single and double J/ψ and Υ production at the LHC energies
[1]. The numerical calculations are realized using the Monte-Carlo event g
enerator KaTie. The calculation results are compared with the LHC data at
the energies √s = 7 and 8 TeV.\n[1]A. A. Chernyshev\, V.A. Saleev\, PHYS
ICAL REVIEW D 106\, 114006 (2022)\n\nhttps://indico.fis.ucm.es/event/19/co
ntributions/370/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/370/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Determining $\\alpha_s$ from Thrust with Power Corrections
DTSTART;VALUE=DATE-TIME:20231024T143000Z
DTEND;VALUE=DATE-TIME:20231024T150000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-378@indico.fis.ucm.es
DESCRIPTION:Speakers: Miguel Benitez-Rathgeb (Universidad de Salamanca)\nI
n recent articles\, the discussion on the treatment of Power Corrections i
n the three-jet limit\, along with its influence on precision $\\alpha_s$
determinations from fits to event shape experimental data\, has attracted
a lot of attention. On the basis of a factorization formula for the $e^+e-
$ thrust distribution\, derived within soft-collinear effective theory\, w
e discuss the treatment of Power Corrections in the tail region of the spe
ctrum and the problems connected to it. In addition\, we review past studi
es on the strong coupling determination from event shapes carried out by s
ome of us\, and provide updated results produced with a new numerical code
which incorporates recent theoretical developments. Furthermore\, we show
the mild effect caused by the tau-dependent power correction recently adv
ocated for in the literature.\n\nhttps://indico.fis.ucm.es/event/19/contri
butions/378/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/378/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse Momentum Measurements with Jets at Next-to-Leading Powe
r
DTSTART;VALUE=DATE-TIME:20231023T140000Z
DTEND;VALUE=DATE-TIME:20231023T143000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-398@indico.fis.ucm.es
DESCRIPTION:Speakers: Max Jaarsma (University of Amsterdam)\nIn view of th
e increasing precision of theoretical calculations and experimental measur
ements\, power corrections to transverse-momentum-dependent observables ha
ve become highly important. Power corrections for TMD observables are a ri
ch and complex subject\, and are difficult to grasp even in the most simpl
e scenarios. Our goal is to understand TMD factorization at next-to-leadin
g power for a relatively simple case: the semi-inclusive annihilation of a
n electron and a positron into two jets. By working with jets\, everything
is perturbatively calculable and there are substantial simplifications co
mpared to the general next-to-leading power framework. We obtain a factori
zed expression for the cross section and identify the new jet functions th
at appear at next-to-leading power. As expected\, we encounter special rap
idity divergences and endpoint divergences. Importantly\, our analysis wit
h jets can be extended to semi-inclusive deep-inelastic scattering\, with
the future Electron-Ion Collider as key application.\n\nhttps://indico.fis
.ucm.es/event/19/contributions/398/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/398/
END:VEVENT
BEGIN:VEVENT
SUMMARY:High precesion prediction of Drell-Yan production
DTSTART;VALUE=DATE-TIME:20231027T093000Z
DTEND;VALUE=DATE-TIME:20231027T100000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-387@indico.fis.ucm.es
DESCRIPTION:Speakers: Tongzhi Yang (University of Zurich)\nIn this talk\,
we will talk about the high-precision fixed order results for the Drell-Ya
n lepton pair production as well as W boson production with the fiducial c
ut of CDFII at N3LO accuracy in QCD. Such high precision is achieved by th
e qt slicing method\, which sums up the large qt contribution obtained fro
m event-generator NNLOJET and the small qt contribution from transverse-mo
mentum-dependent factorization.\n\nhttps://indico.fis.ucm.es/event/19/cont
ributions/387/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/387/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The small $k_T$ region in Drell-Yan production at next-to-leading
order with the Parton Branching Method
DTSTART;VALUE=DATE-TIME:20231027T080000Z
DTEND;VALUE=DATE-TIME:20231027T083000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-376@indico.fis.ucm.es
DESCRIPTION:Speakers: Itana Bubanja ()\nThe Parton-Branching method (PB) a
llows us to determine Transverse Momentum Dependent (TMD) parton densities
from very small to large transverse momentum ($k_T$). In the small $k_T$
range\, both intrinsic parton motion and soft gluons contribute. Our study
highlights the importance of soft gluons below a resolvable scale for int
egrated and TMD parton densities.\n\nPB TMD parton densities\, coupled wit
h NLO calculations in MC@NLO style\, are used to predict Drell-Yan transve
rse momentum spectra across a broad mass range. Using a free parameter\, t
he intrinsic-$k_T$ width is extracted comparing world data to PB-NLO-HERAI
+II-2018 set2 TMD based predictions. Unlike other approaches\, the width o
f the intrinsic-$k_T$ distribution is found independent of the mass of the
Drell-Yan pair and of the center-of-mass energy $\\sqrt{s}$.\n\nhttps://i
ndico.fis.ucm.es/event/19/contributions/376/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/376/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Studies of the 3D nucleon structure at JLab: present and future
DTSTART;VALUE=DATE-TIME:20231026T093000Z
DTEND;VALUE=DATE-TIME:20231026T100000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-402@indico.fis.ucm.es
DESCRIPTION:Speakers: Harutyun Avagyan (Jefferson Lab)\nThe quark-gluon dy
namics manifests itself in a set of non-perturbative functions describing
all possible spin-spin and spin-orbit correlations defining azimuthal mo
dulations in hard scattering processes. Production of correlated hadron pa
irs in current\, as well as target fragmentation regions\, plays an incre
asingly important role in the interpretation of pion electroproduction dat
a in general\, and hadronization process of quarks\, in particular. More s
ignificant\, than originally anticipated\, fraction of pions and kaons com
ing from correlated di-hadrons\, indicated by recent measurements at JLab
\, and supported by various realistic models describing the hadronization
process\, may have a significant impact on various aspects of data analysi
s\, including the modeling\, composition\, and interpretation of semi-inc
lusive DIS data\, as well as calculations of radiative corrections.\nIn th
is contribution\, we will present ongoing studies\, and some near term\, a
s well as long term\, future measurements related to studies of non-pertur
bative QCD effects at Jefferson Lab.\n\nhttps://indico.fis.ucm.es/event/19
/contributions/402/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/402/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Meson TMDs analysis at AMBER
DTSTART;VALUE=DATE-TIME:20231026T100000Z
DTEND;VALUE=DATE-TIME:20231026T103000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-377@indico.fis.ucm.es
DESCRIPTION:Speakers: Filippo Delcarro (INFN Torino)\nPion TMDs are not as
well defined as their proton counterparts\, due to the small amount of av
ailable pion scattering data. The recent measurements of unpolarized Drell
Yan cross section taken at COMPASS with different targets\, could improve
the current understanding of pion structures. In the near future also AMB
ER\, a new fixed-target experiment at CERN SPS\, will help understand the
meson structure\, thanks to its planned program of DY measurements involvi
ng high energy pions and kaosn. In this talk I will give an overview of th
e contribution that these experimental programs will give to the determina
tion of the dynamics of partons and how it differs in proton and mesons.\n
\nhttps://indico.fis.ucm.es/event/19/contributions/377/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/377/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extraction of unpolarized TMDPDF from global fit of Drell-Yan data
at N4LL
DTSTART;VALUE=DATE-TIME:20231026T080000Z
DTEND;VALUE=DATE-TIME:20231026T083000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-400@indico.fis.ucm.es
DESCRIPTION:Speakers: Valentin Moos (University of Regensburg)\nWe present
an extraction of unpolarized transverse momentum dependent parton distrib
utions functions and Collins-Soper kernel from the fit of Drell-Yan and we
ak-vector boson production data at the N4LL order of perturbative accuracy
. Based on this\, Pion TMDPDFs as well as TMD fragmentation functions can
be extracted\, of which preliminary results are available.\n\nhttps://indi
co.fis.ucm.es/event/19/contributions/400/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/400/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Global extraction of unpolarized Transverse Momentum Distributions
DTSTART;VALUE=DATE-TIME:20231026T073000Z
DTEND;VALUE=DATE-TIME:20231026T080000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-384@indico.fis.ucm.es
DESCRIPTION:Speakers: Lorenzo Rossi (University of Pavia & INFN)\nIn this
talk we present the latest results about the extraction of unpolarized Tra
nsverse-Momentum-Dependent (TMD) distributions. We discuss the extraction
of unpolarized quark TMD Parton Distribution Functions (TMD PDFs) in the p
roton\, as well as TMD Fragmentation Functions (TMD FFs)\, from global fit
s of Drell-Yan and Semi-Inclusive Deep-Inelastic Scattering (SIDIS) data s
ets made by the MAP collaboration.\n\nhttps://indico.fis.ucm.es/event/19/c
ontributions/384/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/384/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gluon TMD fragmentation function into quarkonium
DTSTART;VALUE=DATE-TIME:20231025T140000Z
DTEND;VALUE=DATE-TIME:20231025T143000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-394@indico.fis.ucm.es
DESCRIPTION:Speakers: Samuel F. Romera (University of the Basque Country)\
nQuarkonia are perfect laboratories to study the interplay between perturb
ative and nonperturbative QCD\, due to the different momentum scales it pr
ovides. I am going to focus on the production of quarkonia through the fra
gmentation of a gluon\, one of the possible mechanisms to quarkonia produc
tion. I am going to talk about the factorization of the TMD in terms of th
e short-distance coefficients and long-distance matrix elements in the fra
mework of NRQCD\, the theshold expansion in order to describe the heavy qu
arkonium states and I am going to show our recent result of the gluon TMD
fragmentation function into heavy-quarkonium in the color-octet channel.\n
\nhttps://indico.fis.ucm.es/event/19/contributions/394/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/394/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Production of Polarized $J/\\psi$ in NRQCD
DTSTART;VALUE=DATE-TIME:20231025T143000Z
DTEND;VALUE=DATE-TIME:20231025T150000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-382@indico.fis.ucm.es
DESCRIPTION:Speakers: Marston Copeland (Duke University)\nWe calculate the
production of polarized $J/\\psi$ to probe the transverse momentum depend
ent (TMD) quark and gluon PDFs in the proton. Within the TMD framework we
calculate the 18 leading order fragmentation functions for light quarks fr
agmenting to a $J/\\psi$\, considering all possible parton and hadron pola
rizations. We also calculate the production of $J/\\psi$ from photon-gluon
fusion within the collinear factorization framework. We use non-relativis
tic QCD (NRQCD) to write the cross sections in terms of perturbative coeff
icients and non-perturbative NRQCD matrix elements. We then make predictio
ns for semi-inclusive deep inelastic scattering cross sections relevant fo
r the future Electron Ion Collider\, identifying the different kinematic r
egions where each production mechanism dominates.\n\nhttps://indico.fis.uc
m.es/event/19/contributions/382/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/382/
END:VEVENT
BEGIN:VEVENT
SUMMARY:$J/\\psi$ production at NLO with a scale-dependent color-evaporati
on model
DTSTART;VALUE=DATE-TIME:20231025T130000Z
DTEND;VALUE=DATE-TIME:20231025T133000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-396@indico.fis.ucm.es
DESCRIPTION:Speakers: Benjamin Guiot (Universidad Tecnica Federico Santa M
aria)\nNearly ten years ago\, Kang\, Ma\, Qiu\, and Sterman derived an evo
lution equation for a heavy-quark pair fragmenting into a quarkonium. In t
his study we explore the consequence of this evolution for the color-evapo
ration model\, focusing on $J/\\psi$ transverse-momentum distributions in
proton-proton collisions. In particular\, I will show that it brings NLO c
alculations in agreement with data. Given the significant impact of the ev
olution on the transverse-momentum spectrum\, our study suggests that this
effect should be included in the fits of NRQCD long-distance-matrix eleme
nts.\n\nWe used a transverse-momentum-dependent formalism\, and I will arg
ue that quarkonium data could help constrain unintegrated PDFs.\n\nhttps:/
/indico.fis.ucm.es/event/19/contributions/396/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/396/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Transverse Momentum Distributions of Heavy Hadrons and Polarized H
eavy Quarks
DTSTART;VALUE=DATE-TIME:20231025T123000Z
DTEND;VALUE=DATE-TIME:20231025T130000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-389@indico.fis.ucm.es
DESCRIPTION:Speakers: Zhiquan Sun (MIT)\nHeavy (bottom and charm) quarks a
re ideal probes of the nonperturbative dynamics of confinement because the
y effectively serve as static color sources during the entire hadronizatio
n cascade. In this talk\, I discuss the transverse momentum-dependent (TMD
) fragmentation functions (FFs) for heavy quarks fragmenting into heavy ha
drons as powerful tools for probing heavy-quark fragmentation in depth. I
identify novel nonperturbative TMD matrix elements in heavy-quark effectiv
e theory (HQET) and present new TMD sum rules that arise from heavy-quark
spin symmetry. These results lead to a rich phenomenology\, especially for
the heavy-quark Collins effect\, at existing $B$ factories. In addition\,
I calculate all TMD parton distribution functions (PDFs) for the producti
on of heavy quarks from polarized gluons within the nucleon and demonstrat
e the potential of the future EIC to resolve TMD heavy-quark fragmentation
in semi-inclusive DIS.\n\nhttps://indico.fis.ucm.es/event/19/contribution
s/389/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/389/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Measurement of the top-quark mass with the ATLAS experiment in 13
TeV pp collision data.
DTSTART;VALUE=DATE-TIME:20231025T091500Z
DTEND;VALUE=DATE-TIME:20231025T094000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-395@indico.fis.ucm.es
DESCRIPTION:Speakers: Javier Jiménez Peña (IFAE Barcelona)\nThe measurem
ent of the top-quark mass in top-quark pair production using the full Run
2 dataset collected with the ATLAS experiment at √s = 13 TeV will be pre
sented. This measurement is carried out in the dilepton channel using a te
mplate method. The talk will have a special emphasis on the theoretical un
certainties affecting experimental measurements of the top-quark mass\, as
more and more often\, these are becoming the limiting factors to further
improve the precision of current measurements.\n\nhttps://indico.fis.ucm.e
s/event/19/contributions/395/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/395/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Full top-quark mass dependence in diphoton production at NNLO in Q
CD
DTSTART;VALUE=DATE-TIME:20231025T085000Z
DTEND;VALUE=DATE-TIME:20231025T091500Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-379@indico.fis.ucm.es
DESCRIPTION:Speakers: Federico Ripani (Università di Roma “La Sapienza
” and INFN Sezione di Roma)\nI will present the Next-to-next-to-leading
order QCD massive corrections\,\ninduced by a loop of top quarks\, to di-p
hoton production in proton-proton\ncollisions. This process is very import
ant as a test of perturbative QCD\nand as a background process for the dec
ay of a Higgs into two photons.\nAll the involved partonic subprocesses ar
e taken into account\; in\nparticular the quark-antiquark annihilation cha
nnel\, which has required\nthe computation of new two-loop Master Integral
s. These have been evaluated using the\ndifferential equations method\, in
the semi-analitically approach with\ngeneralised power series expansions.
\nI will then present a phenomenological study of the impact of our\ncorre
ctions for different observables.\n\nhttps://indico.fis.ucm.es/event/19/co
ntributions/379/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/379/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Absolute mass threshold resummation for the production of four top
quarks
DTSTART;VALUE=DATE-TIME:20231025T073000Z
DTEND;VALUE=DATE-TIME:20231025T075500Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-369@indico.fis.ucm.es
DESCRIPTION:Speakers: Laura Moreno Valero (University of Münster)\nIn thi
s talk we present results for soft gluon resummation applied to the produc
tion of four top quarks in the absolute mass threshold limit. The theoreti
cal predictions at NLO\, including a full set of strong and electroweak NL
O corrections\, yield a relatively large error due to scale variation. We
compute the resummed cross section at next-to-leading logarithmic (NLL$^\\
prime$) accuracy\, taking into account non-logarithmic $\\mathcal{O}(\\alp
ha_s)$ contributions that do not vanish at threshold. By considering the m
atching of the NLL$^\\prime$ result to the available NLO result\, we achie
ve NLO+NLL$^\\prime$ precision for the total cross section. The threshold-
resummed result shows an improved scale dependence when compared to the fi
xed-order calculation.\n\nhttps://indico.fis.ucm.es/event/19/contributions
/369/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/369/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higgs + hadron/jet inclusive production process with full next-to-
leading accuracy
DTSTART;VALUE=DATE-TIME:20231024T140000Z
DTEND;VALUE=DATE-TIME:20231024T143000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-374@indico.fis.ucm.es
DESCRIPTION:Speakers: Gabriele Gatto ()\nWe investigate the Higgs + hadron
/jet inclusive production process at the LHC in the hybrid factorization s
cheme with full next-to-leading accuracy in the all-order resummation of e
nergy logarithms. We present preliminary results for different key observa
bles\, with the aim of probing the impact of high-energy resummation in th
e Higgs production mechanism.\n\nhttps://indico.fis.ucm.es/event/19/contri
butions/374/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/374/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Weak vector boson production at hadron colliders: combined QCD-QED
transverse-momentum resummation formalism
DTSTART;VALUE=DATE-TIME:20231024T123000Z
DTEND;VALUE=DATE-TIME:20231024T130000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-388@indico.fis.ucm.es
DESCRIPTION:Speakers: Andrea Autieri (Instituto de Física Corpuscular (IF
IC)\, Valencia (Spain))\nThe high level of experimental precision achieved
at hadron colliders requires competitive theoretical predictions in order
to extract fundamental SM parameters\, such as the W boson mass.\nTheoret
ical efforts should therefore be directed towards relevant kinematic distr
ibutions\, such as the transverse momentum (pT) spectrum of the W and Z bo
sons and their ratio. \nIn this talk\, essentially based on our paper (JHE
P 07 (2023) 104)\, I will discuss the combined QCD-QED transverse-momentum
resummation formalism for weak vector boson production at hadron collider
s. In particular\, logarithmically enhanced terms originating from soft an
d/or collinear QCD and QED radiation are consistently evaluated and resumm
ed at NNLL+NNLO in QCD with the inclusion of mixed QCD-QED effects at LL a
nd pure QED effects at NLL\, matched with a fixed-order full-EW NLO contri
bution (i.e. at a loop). A naive abelianisation of the well-established QC
D formalism\, which has been used in the literature to obtain the QED cont
ributions for on-shell Z boson production\, is not sufficient for on-shell
W boson production due to the electric charge of the final state. In part
icular\, for this situation\, we have performed an abelianisation of the h
eavy quark resummation formalism\, and thus properly resum also the QED so
ft radiation of the final state. The inclusion of this last contribution i
s thus the main original feature of our study. Numerical results at hadron
colliders (Tevatron\, LHC) are presented for the on-shell Z and W boson t
ransverse-momentum distributions and their ratio\, potentially relevant in
the context of W boson mass extraction\, showing a non-trivial shape modi
fication caused by final-state radiation and QED effects up to the percent
level.\n\nhttps://indico.fis.ucm.es/event/19/contributions/388/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/388/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resummation Scales in Collinear and Sudakov Processes at Hadron Co
lliders
DTSTART;VALUE=DATE-TIME:20231024T120000Z
DTEND;VALUE=DATE-TIME:20231024T123000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-368@indico.fis.ucm.es
DESCRIPTION:Speakers: Giuseppe Bozzi (University of Cagliari)\nQCD calcula
tions for collider physics make use of perturbative solutions of renormali
sation group equations (RGEs). RGE solutions can contribute significantly
to systematic uncertainties of theoretical predictions for physical observ
ables. We propose a method to express these systematic effects in terms of
resummation scales\, using techniques borrowed from soft-gluon resummatio
n approaches. We discuss applications to collinear and Sudakov processes a
t hadron colliders\, including deep-inelastic scattering (DIS) structure f
unctions and the Drell-Yan (DY) vector-boson transverse momentum distribut
ion.\nThe talk is based on work in progress in collaboration with V. Berto
ne \nand F.Hautmann and on work published in Phys. Rev. D 105 (2022) 09600
3 \n"Perturbative hysteresis and emergent resummation scales".\n\nhttps://
indico.fis.ucm.es/event/19/contributions/368/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/368/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Searching for saturation in forward dijet production at the LHC
DTSTART;VALUE=DATE-TIME:20231024T080000Z
DTEND;VALUE=DATE-TIME:20231024T083000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-399@indico.fis.ucm.es
DESCRIPTION:Speakers: Krzysztof Kutak ()\nI'm going to review recent resul
ts for forward jests at the LHC and EIC as obtained within small-x Improve
d Transverse Momentum Dependent factorization (ITMD). In addition to an el
ementary overview of various approaches to perturbative QCD at high energy
\, including High Energy Factorization\, Color Glass Condensate\, and ITMD
\, we describe the Monte Carlo implementation and discuss the existing and
unpublished phenomenological results for forward dijets.\n\nThe talk is g
oing to be based on\narXiv:2306.17513\nA. van Hameren\, H. Kakkad\, P. Kot
ko\, K. Kutak\, S. Sapeta\n\nhttps://indico.fis.ucm.es/event/19/contributi
ons/399/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/399/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Semi-inclusive Diffractive Deep Inelastic Scattering at Small-x
DTSTART;VALUE=DATE-TIME:20231024T073000Z
DTEND;VALUE=DATE-TIME:20231024T080000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-401@indico.fis.ucm.es
DESCRIPTION:Speakers: Feng Yuan (Lawrence Berkeley National Laboratory)\n
We propose semi-inclusive diffractive deep inelastic scattering to investi
gate the gluon tomography in the nucleon and nuclei at small-x. The releva
nt diffractive quark and gluon parton distribution functions can be comput
ed in terms of the color dipole S-matrices in the fundamental and adjoint
representations\, respectively.\n\nhttps://indico.fis.ucm.es/event/19/cont
ributions/401/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/401/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Local Infrared Safety in four dimensions
DTSTART;VALUE=DATE-TIME:20231023T143000Z
DTEND;VALUE=DATE-TIME:20231023T150000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-373@indico.fis.ucm.es
DESCRIPTION:Speakers: Aniruddha Venkata (Stony Brook University)\nIn this
talk\, I will show a general expression for weighted cross sections in lep
tonic annihilation to hadrons based on time-ordered perturbation theory (T
OPT). For any infrared-safe weight\, the cancellation of infrared diverge
nces is implemented locally at the integrand level\, and in principle can
be evaluated numerically in four dimensions. We go on to show that it is p
ossible to eliminate unphysical singularities that appear in time-ordered
perturbation theory for arbitrary amplitudes. This is done by reorganizing
TOPT into an equivalent form that combines classes of time orderings into
a “partially time-ordered perturbation theory”. This formalism is bas
ed on the poset structure inherently present in TOPT. I will apply this fo
rmalism to leptonic annihilation to show a formula for a generic weighted
cross-section\, only carrying singularities that correspond to unitarity c
uts. \n\nIn the process of eliminating unphysical singularities\, cuts tha
t disconnect the graph into more than two pieces\, we will find that long-
time processes are encapsulated by real\, non-local composite vertices. In
the example of leptonic annihilation cross-sections\, we will make this m
anifest through a local factorization between long-time and short-time pro
cesses. I will make some comments about potential connections between thi
s formalism and the organization of power corrections in perturbation theo
ry. I will also demonstrate how to carry out contour deformations in a ge
neric Feynman parametrized amplitude\, systematically\, to all orders. We
will see that our contour deformations automatically vanish on each pinch
surface\, admitting a physical singularity upon integrating around a pinch
. We will find that\, here\, the difference of IR-safe weight functions v
anishes in such a way that the integrand is locally finite.\n\nhttps://ind
ico.fis.ucm.es/event/19/contributions/373/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/373/
END:VEVENT
BEGIN:VEVENT
SUMMARY:TMD factorization at next-to-leading power
DTSTART;VALUE=DATE-TIME:20231023T130000Z
DTEND;VALUE=DATE-TIME:20231023T133000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-366@indico.fis.ucm.es
DESCRIPTION:Speakers: Simone Rodini (DESY)\nIn this talk I will review the
recent progress and results concerning next-to-leading power factorizatio
n. I will mostly focus on semi-inclusive DIS process\, showing the derivat
ion of the structure functions at one-loop accuracy.\nI will comment on so
me of the specific details that emerge at next-to-leading power\, such as
the cancellation of special rapidity divergences and the emergence of Qiu-
Sterman-like contribution in the factorization formula.\n\nhttps://indico.
fis.ucm.es/event/19/contributions/366/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/366/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Subleading-Power Soft Subtleties in SIDIS
DTSTART;VALUE=DATE-TIME:20231023T123000Z
DTEND;VALUE=DATE-TIME:20231023T130000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-390@indico.fis.ucm.es
DESCRIPTION:Speakers: Anjie Gao (MIT)\nWe consider the factorization of tr
ansverse momentum-dependent azimuthal asymmetries in semi-inclusive DIS (S
IDIS)\, Drell-Yan and e+e- to dihadron\, which appear at the first sublead
ing power in the expansion for small transverse momentum. These observable
s feature an intricate all-order resummation structure common to many appl
ications of SCET at subleading power. In addition\, and perhaps more impor
tantly\, they provide access to nonperturbative higher-point quark-gluon-q
uark (QGQ) correlation functions in the nucleon or in the fragmentation ca
scade. In this talk I discuss the role of soft contributions that give ris
e to a distinct term present only in SIDIS factorization theorems. This pl
ays a crucial role for defining finite universal QGQ correlators.\n\nhttps
://indico.fis.ucm.es/event/19/contributions/390/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/390/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Applications of SCET to Transverse Momentum Distributions
DTSTART;VALUE=DATE-TIME:20231023T120000Z
DTEND;VALUE=DATE-TIME:20231023T123000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-371@indico.fis.ucm.es
DESCRIPTION:Speakers: Iain Stewart (MIT)\nIn this talk I discuss applicati
ons of Soft Collinear Effective Theory (SCET) to TMD observables at leadin
g and subleading power. In particular\, I discuss matching between resumm
ed and fixed order results to obtain cross sections accurate for both smal
l and large transverse momentum simultaneously\, and applications like th
e transverse lepton pT in W production. I also discuss the collinear and
soft ingredients needed for bare factorization for SIDIS\, Drell-Yan\, and
e+e- to dihadrons at subleading and subsubleading power.\n\nhttps://indic
o.fis.ucm.es/event/19/contributions/371/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/371/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Top Quark Mass Calibration for Monte Carlo Event Generators
DTSTART;VALUE=DATE-TIME:20231027T083000Z
DTEND;VALUE=DATE-TIME:20231027T090000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-404@indico.fis.ucm.es
DESCRIPTION:Speakers: Vicent Mateu (University of Salamanca)\nWe generaliz
e and update our former top quark mass calibration framework for Monte Car
lo event generators based on the e+e- hadron-level 2-jettiness distributio
n in the resonance region for boosted top production. The updated framewor
k includes the addition of the shape variables sum of jet masses\, modifie
d jet mass and the treatment of two more gap subtraction schemes to remove
the leading renormalon. These generalizations entail implementing a more
versatile shape-function fit procedure and accounting for a certain type o
f massive power corrections. The theoretical description employs boosted h
eavy-quark effective theory at NNLL matched to soft-collinear effective th
eory at NNLL and full QCD at NLO and includes the dominant top width effec
ts. We update the top mass calibration results by applying the new framewo
rk to PYTHIA 8.205\, HERWIG 7.2 and SHERPA 2.2.11.\n\nhttps://indico.fis.u
cm.es/event/19/contributions/404/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/404/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Test of gluon TMD from HERA data at low Q^2 and soft hadron produc
tion at LHC
DTSTART;VALUE=DATE-TIME:20231026T133000Z
DTEND;VALUE=DATE-TIME:20231026T140000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-412@indico.fis.ucm.es
DESCRIPTION:Speakers: Gennady Lykasov ()\nUsing the analytical expression
for traverse momentum dependent (TMD) gluon density in a proton \, a self-
consistent simultaneous description of low Q^2 data on proton structure fu
nction F_2(x\,Q^2)\, reduced cross-section for the electron proton scatter
ing at HERA and soft hadron production in pp collisions at the LHC is achi
eved in the framework of color dipole approach and modified quark-gluon st
ring model.\n\nhttps://indico.fis.ucm.es/event/19/contributions/412/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/412/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Recent progress on track functions
DTSTART;VALUE=DATE-TIME:20231026T150000Z
DTEND;VALUE=DATE-TIME:20231026T153000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-391@indico.fis.ucm.es
DESCRIPTION:Speakers: Wouter Waalewijn (University of Amsterdam)\nTrack-ba
sed observables offer superior angular resolution and pile-up suppression.
I developed a theoretical framework to account for the conversion to trac
ks using track functions\, which are a kind of generalized fragmentation f
unctions. I will discuss recent progress\, including our determination of
the evolution of track functions at order alpha_s^2\, from which the evolu
tion of multi-hadron fragmentation functions can be obtained. I will also
discuss the use of track functions in new observables\, focussing in parti
cular on energy correlators.\n\nhttps://indico.fis.ucm.es/event/19/contrib
utions/391/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/391/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a global reweighting of TMD densities
DTSTART;VALUE=DATE-TIME:20231026T090000Z
DTEND;VALUE=DATE-TIME:20231026T093000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-392@indico.fis.ucm.es
DESCRIPTION:Speakers: Carlo Flore (IJCLab Orsay)\nIn this talk\, we presen
t preliminary results about the path to a global Bayesian reweighting of T
MD functions. Within an effective model as the Generalized Parton Model\,
and by adopting the Sivers\, transversity and Collins functions as extract
ed from SIDIS and $e^+ e^-$ azimuthal asymmetries\, we plan a simultaneous
reweighting of these TMDs using data on Single-Spin Asymmetries measured
at RHIC. The strategy for generalizing Bayesian reweighting to multiple fi
ts is illustrated\, together with compression techniques\, that will allow
us to improve the efficiency of the whole procedure. We expect this work
to give some hints about TMD universality\, the role of positivity bounds
and to quantitatively estimate factorization breaking effects in inclusive
processes.\n\nhttps://indico.fis.ucm.es/event/19/contributions/392/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/392/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Mellin Barnes for massive bubble diagrams
DTSTART;VALUE=DATE-TIME:20231027T073000Z
DTEND;VALUE=DATE-TIME:20231027T080000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-411@indico.fis.ucm.es
DESCRIPTION:Speakers: Alejandro Bris (IFT-UAM)\nIn this talk we present a
procedure to deal with massive bubbles analoguos to the dispersive integra
l method but with the Mellin Barnes representation of the diagram. This al
lows us to simplify the needed previous loop order computations leading to
the same ones as in renormalon calculus.\nFurthermore\, if we postpone th
e inverse Mellin integral until the very end we can easily get analytic re
sults\, not only for the diagrams but for the resummed expressions of the
corresponding part of the matrix element that would otherwise involve a nu
merical integration. These results can always be expressed as fast-converg
ing power series.\nWe applied the method to get the bHQET Hard and Jet fun
ctions\, we reproduce other cases that were already known and it also coul
d be used for massive bosons.\n\nhttps://indico.fis.ucm.es/event/19/contri
butions/411/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/411/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diffractive parton distribution functions considering higher twist
corrections
DTSTART;VALUE=DATE-TIME:20231024T100000Z
DTEND;VALUE=DATE-TIME:20231024T103000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-386@indico.fis.ucm.es
DESCRIPTION:Speakers: Maral Salajegheh (HISKP\, University of Bonn)\, Hamz
eh Khanpour (AGH University of Science and Technology)\nWe introduce SKMHS
22\, a novel set of diffractive parton distribution functions (PDFs) and t
heir uncertainties\, computed at both next-to-leading-order and next-to-ne
xt-to-leading-order accuracy within the framework of perturbative QCD in x
Fitter. Our analysis comprehensively addresses diffractive deep inelastic
scattering (DIS) data from HERA\, encompassing the latest H1/ZEUS measurem
ents\, while considering three distinct perspectives: the standard twist-2
contribution\, the twist-4 correction involving longitudinal virtual phot
ons\, and the impact of subleading Reggeon exchange on the structure-funct
ion $F_2^D$. To handle heavy flavors\, we employ the Thorne-Roberts scheme
. Notably\, the inclusion of twist-4 and subleading Reggeon contributions
significantly enhances the description of the data\, particularly in the h
igh-$\\beta$ region. We also investigate the stability of the SKMHS22 QCD
fit with the addition of higher-order corrections\, leading to subtle impr
ovements in data agreement. These SKMHS22 PDFs exhibit strong agreement wi
th a wide range of diffractive DIS data\, outperforming prior fits\, and a
re accessible via the LHAPDF interface. We conclude with forward-looking s
uggestions for further research in this domain.\n\nhttps://indico.fis.ucm.
es/event/19/contributions/386/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/386/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Quark and gluon diffractive distributions at small xP
DTSTART;VALUE=DATE-TIME:20231024T093000Z
DTEND;VALUE=DATE-TIME:20231024T100000Z
DTSTAMP;VALUE=DATE-TIME:20240916T131946Z
UID:indico-contribution-19-381@indico.fis.ucm.es
DESCRIPTION:Speakers: Dionysis N. Triantafyllopoulos (ECT*\, Trento)\nWe s
tudy diffractive (2+1)-jet production in photon nucleus collisions at high
energy in the CGC framework. We focus in the regime in which two of the j
ets are hard\, yet we show that large dipoles with size 1/Qs (with Qs the
nucleus saturation momentum) control the cross section. These dominant con
tributions admit factorization in terms of parton TMDs of the Pomeron. The
bulk of these TMDs is located at transverse momenta smaller or of the ord
er of Qs and allows one to derive explicit results of the respective DPDFs
.\n\nhttps://indico.fis.ucm.es/event/19/contributions/381/
LOCATION:Facultad de Físicas Aula M1
URL:https://indico.fis.ucm.es/event/19/contributions/381/
END:VEVENT
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