Conveners
Monday: Monday 1
- Miguel Echevarria (University of Alcala)
Monday: Monday 2
- Riccardo Nagar (University of Milan-Bicocca)
Monday: Monday 3
- José Manuel Alarcón (Universidad de Alcalá)
Monday: Monday 4
- Werner Vogelsang (University of Tübingen)
-
Miguel Echevarria (University of Alcala)10/4/21, 9:00 AM
-
Craig Roberts (Nanjing University)10/4/21, 9:10 AM
Nature has two sources of mass. One is the Higgs boson, which is responsible for every mass scale that appears explicitly in the Standard Model Lagrangian. The Higgs was discovered at CERN in 2012; and with that discovery, the Standard Model became complete.
However, in connection with everyday matter, the material which constitutes our computers and ourselves, the Higgs produces little...
Go to contribution page -
Prof. Paul Hoyer (University of Helsinki)10/4/21, 9:40 AM
With $e^-$ constituents in a classical potential atoms are at the borderline between hard processes and soft classical physics. Data and phenomenology indicate that hadrons are similar. The importance of this cannot be overemphasized: It suggests a first-principles, analytic QCD approach to strong dynamics analogous to that long developed for QED atoms.
Bound state perturbation theory is...
Go to contribution page -
Juan Rojo (VU Amsterdam)10/4/21, 10:10 AM
I review recent progress in the determination of the collinearly-integrated parton distribution functions of the proton. I will focus on the recent NNPDF4.0 determination, a state-of-the-art analysis based on almost independent 100 datasets. NNPDF4.0 is constructed by means of a novel methodology through hyperparameter optimisation, leading to an efficient fitting algorithm built upon...
Go to contribution page -
Edoardo Franzoso (Università e INFN, Ferrara (IT))10/4/21, 10:40 AM
Originally conceived for precise luminosity measurements, the gas injection system SMOG currently allows the unique LHCb detector capabilities to be exploited for fixed-target studies in proton-gas collisions at $\sqrt{s}$ ∼ 100 GeV. The first results obtained with SMOG data are reported: antiproton production with a He target and $J/\psi$, $D^0$ productions in p-He and p-Ar collisions. The...
Go to contribution page -
Krzysztof Cichy (Adam Mickiewicz University)10/4/21, 11:30 AM
For a long time, lattice QCD was unable to address the x-dependence of partonic distributions, direct access to which is impossible in Euclidean spacetime. Recent years have brought a breakthrough for such calculations when it was realized that partonic light-cone correlations can be accessed through spatial correlations computable on the lattice. Appropriately devised observables can be...
Go to contribution page -
Yong Zhao (Argonne National Laboratory)10/4/21, 12:00 PM
We develop a procedure to renormalize the quasi parton distribution in the recently proposed hybrid scheme and match it to the $\overline{\rm MS}$ scheme light-cone parton distribution at next-to-next-to-leading-order in perturbation theory. Under this procedure we calculate the pion valence quark
Go to contribution page
distribution using two fine lattices with spacing
$a=0.04$ fm and $0.06$ fm and valence pion... -
Aleksander Kusina (Institute of Nuclear Physics PAN, Krakow)10/4/21, 12:30 PM
The structure of nucleons as well as nuclei at large longitudinal momenta, x, is crucial for understanding QCD confinement, the origin of non-perturbative charm and beauty in the proton, or for explaining the origins of the nuclear EMC effect. Parton distribution functions (PDFs), which describe the longitudinal structure of hadrons, are typically determined in global analysis of experimental...
Go to contribution page -
Xiang Gao (CCNU)10/4/21, 12:50 PM
We present the first lattice calculation of pion valence parton distribution using matching formula at NNLO level. We use the Wilson-Clover fermion on three 2+1 flavor HISQ ensembles of lattice spacings a = 0.04, 0.06 and 0.076 fm, with two pion mass including the physical one. Two unitary Domain-Wall calculations at physical point are also presented. This allows us to control the continuum...
Go to contribution page -
Misak Sargsian (Florida International University)10/4/21, 1:10 PM
We developed a non-perturbative model for valence parton distribution functions (PDFs) based on the mean field interactions of valence quarks in the nucleonic interior. The model is based on the separation of the valence three-quark cluster and residual system in the nucleon. Then the nucleon structure function is calculated within the effective light-front diagrammatic approach ...
Go to contribution page -
Christian Weiss10/4/21, 2:45 PM
We review the theory, interpretation, and applications of the nucleon elastic form factors (vector, scalar, axial, other QCD operators) at low/moderate momentum tranfers (Q2 ~< 1 GeV2). We emphasize the importance of analyticity and dispersion theory for both empirical analysis and dynamical calculations. Topics include: (a) Dispersive analysis of the nucleon electromagnetic form factors,...
Go to contribution page -
Dr Douglas Higinbotham (Jefferson Lab)10/4/21, 3:15 PM
In 2010, precise determination of the proton radius from muonic lamb shift data, a result that systematically disagreed with previous atomic lamb shift and electron scattering data, sparked what was to become known as the proton radius puzzle. Since then, there have many new measurements and new theory calculations done to understand the source of the discrepancy. A preponderance of the new...
Go to contribution page -
Clara Peset Martin (Universidad de Alcalá de Henares)10/4/21, 3:45 PM
Effective field theories are exceptionally suited to define and determine the proton radius and its relatives from low energy observables. They not only provide a unified and unambiguous definition of the low energy constants that naturally includes electromagnetic corrections, but they also yield a robust determination of the theoretical uncertainty. In this talk, I will present the...
Go to contribution page -
Hamza Atac (Temple University)10/4/21, 4:05 PM
The Generalized Polarizabilities (GPs) are fundamental properties of the
Go to contribution page
nucleon. They characterize the nucleon's response to an applied
electromagnetic field, offering access to the polarization densities inside
the nucleon, and as such they represent an essential part for a complete
understanding of the nucleon structure and dynamics. The GPs can be
explored through the measurement of... -
Jianwei Qiu (Jefferson Lab)10/4/21, 5:00 PM
In this talk, I will present the details of a new factorized approach to inclusive lepton-hadron scattering, in particular to semi-inclusive deep-inelastic scattering, which treats QED and QCD radiation on equal footing, and provides a systematically improvable approximation to the extraction of transverse momentum dependent parton distributions. We demonstrate how the QED contributions can be...
Go to contribution page -
Feng Yuan (Lawrence Berkeley National Laboratory)10/4/21, 5:30 PM
It has been more than 30 years since the EMC published a surprising result on the spin structure of the proton: the spins of its three quark components account for only a small part of the spin of the proton. In this talk, we discuss what has been learned so far, what is still missing and what could be learned from the upcoming experiments, including the Jefferson Lab 12 GeV upgrade and the...
Go to contribution page -
Prof. Dennis Sivers (Portland Physics Institute and University of Michigan)10/4/21, 6:00 PM
The structure of hadrons depends strongly on the confinement mechanism. This talk illustrates the dynamics of confinement at the border between the interior and exterior of hadrons. The extended chiral structure is illustrated in chromostatics and amplified by a discussion of vortices and the orbital angular momentum resulting in the pion tornado.
Go to contribution page -
Daniel Pitonyak (Lebanon Valley College)10/4/21, 6:30 PM
I will report on recent developments in the extraction of the transversity distribution from various methodologies, including transverse momentum dependent (TMD) and collinear twist-3 observables, collinear dihadron fragmentation processes, and lattice QCD. Connected to this is the calculation of the tensor charges of the nucleon, which are important quantities that sit at the intersection of...
Go to contribution page