Conveners
Thursday: Thursday 1
- Alexey Vladimirov
Thursday: Thursday 2
- Umberto D'Alesio (University and INFN Cagliari)
Thursday: Thursday 3
- Valerio Bertone (CEA Saclay)
Thursday: Thursday 4
- Jean-Philippe Lansberg (Paris-Saclay U. - IJCLab - CNRS)
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Riccardo Nagar (University of Milan-Bicocca)10/7/21, 9:00 AM
Double parton scattering (DPS) is the phenomenon in which, during a nucleon-nucleon scattering, two partons from each nucleon undergo two distinct hard interactions.
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The cross section resulting from DPS interactions is normally power-suppressed with respect to the traditional single parton scattering (SPS) cross section. However, the two contributions can be similar in size in some... -
Peter Plößl (Deutsches Elektronen-Synchrotron DESY)10/7/21, 9:30 AM
In factorization theorems for double parton scattering (DPS) the non-perturbative parts of the cross section are encoded in universal functions, double parton distributions (DPDs) in the case of collinear factorization and double transverse momentum dependent parton distributions (dTMDs) for transverse momentum dependent (TMD) factorization.
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These distributions contain a wealth of information... -
Matteo Rinaldi (Dipartimento di Fisica e Geologia. Università degli studi di Perugia. Istituto Nazionale di Fisica Nucleare, sezione di Perugia.)10/7/21, 10:00 AM
In this contribution, I discuss the possibilities offered by double parton scattering (DPS) processes initiated by photon-proton interactions. In fact, the DPS cross section depends on the double parton distribution functions (dPDFs) of hadrons. These new quantities encode new informations on the 3D partonic structure of the proton, complementary to TMDs and GPDs. In fact, dPDFs are...
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Emanuel Ydrefors (IMPCAS)10/7/21, 10:20 AM
Understanding the structure and dynamics of the proton constitute one of the most important challenges in hadron physics. From the theoretical point of view, one of the challenges is to extract from Lattice QCD calculations, performed in Euclidean space, Minkowskian quantities such as the proton parton distribution function. Due to the inherent difficulties associated with the mapping of...
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Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN-TIFPA)10/7/21, 10:40 AM
We present exploratory studies of the 3D gluon content of the proton, as a result of analyses on leading-twist transverse-momentum-dependent (TMD) gluon distribution functions, calculated in a spectator model for the parent proton. Our formalism embodies a fit-based parameterization for the spectator-mass density, suited to describe both the small- and the moderate-x regime. Particular...
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María Gómez-Rocha (Universidad de Granada)10/7/21, 11:30 AM
In the context of a theory for only one heavy flavor in QCD, we use the renormalization group procedure for effective particles (RGPEP) to derive the effective potential for $Q\bar Q$ and $QQQ$ that arises at the energy scale at which bound states are formed. The RGPEP provides the connection between low- and high-energy interactions in QCD through the construction of effective particles....
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Cristian Pisano10/7/21, 11:50 AM
We study the polar and azimuthal decay angular distributions of $J/\psi$ mesons produced in semi-inclusive, deep-inelastic electron-proton scattering. For the description of the quarkonium formation mechanism, we adopt the framework of Non-Relativistic Quantum Chromodynamics, with the inclusion of the intermediate color octet-channels that are suppressed at most by a factor $v^4$ in the...
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Yelyzaveta Yedelkina (Paris-Saclay University, IJCLab Orsay)10/7/21, 12:10 PM
We revisit inclusive $J/\psi$ and $\Upsilon$ photoproduction at lepton-hadron colliders, namely in the limit when the exchange photon is quasi real. Our computation includes the leading-$v$ next-to-leading order (NLO) $\alpha_s$ corrections. Similarly to the case of NLO charmonium-hadroproduction processes, the resulting cross sections obtained in the $\overline{\text{MS}}$ factorisation...
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Marc Schlegel (University of Tübingen)10/7/21, 12:30 PM
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Yi-Bo Yang10/7/21, 12:50 PM
I will show the strategy to access the transverse-momentum dependent parton distribution function (TMD-PDF) through the large momentum effective theory (LaMET), and also summarize the present Lattice QCD progresses on the related topics, likes the renormalization, soft function, TMD wave function, Collins-Soper kernel and so on.
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Nilanga Liyanage (University of Virginia)10/7/21, 2:45 PM
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Timothy Hayward (University of Connecticut)10/7/21, 3:15 PM
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Anna Martin (Trieste University and INFN)10/7/21, 3:45 PM
The COMPASS experiment continues the investigation of the transverse spin and transverse momentum structure of the nucleon.
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Very recently, a new set of measurements has been performed in SIDIS of high energy muons off unpolarised protons. This talk will review the results on the transverse momentum distributions of the final state hadrons. A fairly complete study of the kinematic dependence... -
Jose Goity (Hampton University and Jefferson Lab)10/7/21, 4:05 PM
The transverse single-spin asymmetry in inclusive electron-nucleon scattering, e + N(S_T) -> e’ + X, represents a pure two-photon exchange observable and is of fundamental interest for exploring higher-order QED effects in electron scattering. We compute this observable in the resonance region, where excitation of Delta isobars occurs in both intermediate and final states. We employ a novel...
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Salvatore Fazio (University of Calabria & INFN Cosenza - Italy)10/7/21, 5:00 PM
The Relativistic Heavy Ion Collider (RHIC) is the world's only polarized proton+proton collider, capable of reaching center of mass energies up to 510 GeV. The STAR experiment at RHIC has been carrying out a cold QCD program in order to gain deeper insight into the proton's spin structure and dynamics.
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Data from longitudinally polarized $p$+$p$ collisions allow one to study... -
Stanley Brodsky (SLAC National Accelerator Laboratory, Stanford University)10/7/21, 5:30 PM
I will survey a number of new developments in hadron physics
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which can be derived from the application of super-conformal quantum
mechanics and lightฉ\front holography -- its embedding in higher
dimensional gravity theory. This includes new insights into the
physics of color confinement, chiral symmetry, the spectroscopy and
dynamics of hadrons, as well as surprising supersymmetric... -
Ian Balitsky (JLab/ODU)
The Drell-Yan hadronic tensor is calculated in the $s\gg Q^2\gg q_\perp^2$ kinematical region with ${q_\perp^2\over Q^2}$ accuracy, first at the tree level and then with the double-log accuracy. It is demonstrated that in the leading order in $N_c$ the higher-twist quark-quark-gluon TMDs reduce to leading-twist TMDs due to QCD equation of motion. The resulting tensor for unpolarized hadrons...
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