Ms
Xiaorong Zhou
(University of Science and Technology of China)
17/08/2019, 14:30
Session 6: QCD and hadron structure
Parallel
Electromagnetic form factors of baryons provide fundamental information about their structure and dynamics. They constitute a rigorous test of non-perturbative QCD as well as of phenomenological models. However, results in the time-like region have large uncertainties. The production cross section and form factors of hyperons are hardly explored. Based on 500 pb^-1 of data collected with the...
Qinghua He
(Nanjing University of Aeronautics and Astronautics)
17/08/2019, 14:55
Session 6: QCD and hadron structure
Parallel
The space-time properties of the excited nucleons may provide useful information to test the non-perturbative QCD models attempting to describe the hadron production process. In this work we attempt to measure the excited baryon Δ(1232)‘s radius using Bose-Einstein correlations (BEC) between two neutral pions from photo-production off a hydrogen/deuterium target at the incident photon energies...
Dr
Minghui Ding
(Nankai University)
17/08/2019, 15:15
Session 6: QCD and hadron structure
Parallel
In this talk, I will present the study on two photon transition form factors of neutral pseudoscalar mesons with a continuum approach. It delivers an understanding of the distribution of valence-quarks within mesons. A unified picture for transition form factors of mesons connecting pion, flavor mixing states and heavy quarkonia will be drawn.
Mr
Kaiyu Fu
(Institute of Modern Physics, Chinese Academy of Sciences)
17/08/2019, 15:35
Session 6: QCD and hadron structure
Parallel
Basis Light-front Quantization (BLFQ) is a newly developed nonperturbative approach, aiming for solving relativistic bound systems based on the Hamiltonian formalism of the lightfront dynamics. In this work, we introduce its application to the positronium system with a dynamical photon mediating the interaction between the positron and the electron. we show the nonperturbative Hamiltonian...
Cintia Willemyns
(Universite de Mons)
17/08/2019, 15:55
Session 6: QCD and hadron structure
Parallel
The asymptotic freedom in QCD allows for accurate calculations at high energy using perturbation theory. At low energies, typical of hadronic systems, a perturbative approach using the coupling constant as the expansion parameter is not appropriate. Baryon spectroscopy has been essential for our understanding of QCD in the low-energy, strong-coupling regime. In this context, the quark model...
Yi-Bo Yang
(ITP/CAS)
17/08/2019, 16:45
Session 6: QCD and hadron structure
Leading parallel
Higgs boson provides the origin of quark masses. But how it is related to the proton mass and thus the masses of nuclei and atoms is another question. I will present the state-of-the-art understading of the proton mass based on the Lattice QCD calculation of QCD energy momentum tensor, and a outlook on how to access the trace anomaly in the near future.
Swagato Mukherjee
(Brookhaven National Laboratory)
17/08/2019, 17:10
Session 6: QCD and hadron structure
Parallel
I will present recent lattice QCD calculations on x-dependent valance parton distribution function (PDF) of pion. Results for both quasi- and pseudo-PDF using unprecedented fine lattices will be presented. Implications of these QCD-based results on the moments and large-x behavior of the pion light-cone PDF will be discussed.
Shaoyang Jia
(Iowa State University)
17/08/2019, 17:30
Session 6: QCD and hadron structure
Parallel
We solve the Minkowski-space Schwinger-Dyson equation for the fermion propagator in QED with massive photons. Specifically, we work in the quenched approximation within the rainbow-ladder truncation. Loop divergences are regularized either by the Pauli-Villars regularization or by the dimensional regularization. With moderately strong fermion-photon coupling, we find that the analytic...
Raya Khepani
(Nankai University)
17/08/2019, 17:50
Session 6: QCD and hadron structure
Parallel
Dynamical chiral symmetry breaking and confinement are two emergent phenomena of QCD, orchestrating the observed spectrum of hadrons and their properties. The running of the corresponding mass function reflects itself in several physical observables such as form factors and parton distribution functions inside hadrons. This study can be naturally carried out through QCD’s fundamental field...
Emanuele Roberto Nocera
(Nikhef)
18/08/2019, 16:15
Session 6: QCD and hadron structure
Leading parallel
I review recent progress in the determination of the collinear parton distribution functions (PDFs) of the proton. I focus on how the needs for accuracy and precision in current and future programs at high-energy accelerators are addressed in contemporary PDF sets. I discuss the impact on PDFs of the uncertainties coming from the data, the theory and the methodology, and I outline some...
Jinlong Zhang
(Stony Brook University)
18/08/2019, 16:40
Session 6: QCD and hadron structure
Parallel
The production of $W^\pm$ bosons in longitudinally polarized proton-proton collisions at RHIC provides a direct probe for the spin-flavor structure of the proton through the parity-violating single-spin asymmetry, $A_L$. At STAR, the leptonic decay channel $W \to e\nu$ can be effectively measured with the electromagnetic calorimeters and time projection chamber. STAR has measured the $A_L(W)$...
Prof.
Yu-Jie Zhang
(Beihang University)
18/08/2019, 17:00
Session 6: QCD and hadron structure
Parallel
We propose that the process of triple prompt J/ψ hadroproduction is a very clean hard probe of multiple-parton scatterings at high-energy hadron colliders, especially the least known triple-parton scattering. A first complete study is carried out by considering single-, double-, and triple-parton scatterings coherently. Our calculation shows that it is a golden channel to probe double- and...
Mr
Jiangshan Lan
(Institute of Modern Physics, Chinese Academy of Sciences)
18/08/2019, 17:20
Session 6: QCD and hadron structure
Parallel
We study the parton distribution functions of the pion and the kaon from the eigenstates of a light front effective Hamiltonian in the constituent quark-antiquark representation suitable for low-momentum scale applications.
By taking these scales as the only free parameters, the valence quark distribution functions of the pion, after QCD evolution, are consistent with the experimental data...
Po-Ju Lin
(IPN-Orsay, CNRS/IN2P3)
20/08/2019, 08:30
Session 6: QCD and hadron structure
Leading parallel
Encapsulating the transverse position of partons as functions of their longitudinal momentum, Generalized Parton Distributions (GPDs) go beyond the 1-dimensional description of the partonic structure of the nucleon and provides a 3-dimensional picture of the nucleon. GPDs have drawn considerable theoretical interest and been studied by experimental efforts through processes such as Deeply...
Ho San KO
(I)
20/08/2019, 08:55
Session 6: QCD and hadron structure
Parallel
Deeply Virtual Compton Scattering (DVCS) is the simplest exclusive process to access Generalized Parton Distributions (GPDs). GPDs encode the correlation between the spacial distribution of partons inside the nucleon and their momentum. An upcoming DVCS experiment in Hall C at Jefferson Lab (Virginia, U.S.A.) will provide the highest precision data in a vast $Q^2$-$x_B$ region accessible by a...
Mr
Shengying Zhao
(Institut de Physique Nucléaire d’Orsay, CNRS-IN2P3, Université Paris-Sud & Paris-Saclay, 91406 Orsay, France)
20/08/2019, 09:15
Session 6: QCD and hadron structure
Parallel
The Generalized Parton Distributions (GPDs) are the appropriate framework for a universal description of the partonic structure of the nucleon. Encoding the correlations between the elementary constituents of the nucleon, GPDs allow a 3-dimensional imaging of the nucleon from the dynamical link between the transverse position and the longitudinal momentum of partons. Double Deeply Virtual...
Dr
Stefan Diehl
(stefan.diehl@exp2.physik.uni-gessen.de)
20/08/2019, 09:35
Session 6: QCD and hadron structure
Parallel
For the first time, we have measured single beam spin asymmetries to extract $A_{LU}^{sin(\phi)}$ moments from the hard exclusive π$^{+}$ channel off the unpolarized hydrogen target in a wide range of kinematics from forward angles to backward angles in the center of mass frame.
While many experiments showed the QCD factorization mechanism in the "nearly forward region"
(large Q² and small...
Shanzhen Chen
(INFN)
20/08/2019, 09:55
Session 6: QCD and hadron structure
Parallel
At the LHC, in ultra-peripheral heavy-ion collisions the highly boosted electromagnetic field of the beam particles represents a source of quasi-real photon. Vector meson photo-production measurements in Pb-Pb collisions are sensitive to the gluon parton distribution functions in the nucleus. LHCb results on charmonium production in ultra-peripheral Pb-Pb collisions as well as the prospects...
Zhongbo Kang
(U)
20/08/2019, 10:45
Session 6: QCD and hadron structure
Leading parallel
We will provide the recent progress in TMD physics. In particular I will emphasize the recent TMD global analysis of both unpolarized and polarized TMD parton distribution functions in standard SIDIS, Drell-Yan, and e+e- channels. Then I will present the progress on how one can go beyond these processes to probe TMD physics in vector-boson tagged jet production. We finish the talk with the...
Fangcheng He
(IHEP)
20/08/2019, 11:10
Session 6: QCD and hadron structure
Parallel
We calculate the generalized and transverse momentum dependent parton distribution function with chiral effective theory. The results are comparable with experimental results.
Mr
Siqi Xu
(IMP)
20/08/2019, 11:30
Session 6: QCD and hadron structure
Parallel
Basis Light-front Quantization (BLFQ) is a non-perturbative method for solving bound state problems in the light-front Hamiltonian formalism. It has already been used to study QED and QCD systems like the positronium and quarkonium. In this work, we apply BLFQ to investigate the baryon system. We restrict ourselves to the valence sector and adopt an effective Hamiltonian which contains the...
Sreeraj Nair
(Institute of Modern Physics CAS)
20/08/2019, 11:50
Session 6: QCD and hadron structure
Parallel
The quasi-probabilistic Wigner distributions are the quantum mechanical analog of the classical phase-space distributions. We investigate quark Wigner distributions for a quark state dressed with a gluon, which can be thought of as a simple composite and relativistic spin-1/2 state with a gluonic degree of freedom. We calculate various polarization configurations, namely...
Dr
Yutie Liang
(Institute of Modern Physics, CAS)
20/08/2019, 14:00
Session 6: QCD and hadron structure
Leading parallel
Electron Ion Collider (EIC), regarded as the ”super electron microscope”, can provide the clearest image inside of the nucleon. It is the most ideal tool to understand the internal structure of the nuclear matter, especially the quark-gluon structure of the nucleon and nuclei. Polarized EICs are the next generation ”multi-dimensional electron microscopes” that are most effective in studying...
Zhongbo Kang
(U)
20/08/2019, 14:25
Session 6: QCD and hadron structure
Parallel
An Electron Ion Collider (EIC) proposed in the U.S. has received wide support from Nuclear Science Advisory Committee and National Academy of Sciences. With flexible collision energies, high luminosity, and high polarization, EIC will enable us to perform quantum tomography of nucleons and nuclei, and explore a new form of matter - color glass condensate. In this talk, I will highlight these...
Dr
Zhiwen Zhao
(Duke University)
20/08/2019, 14:45
Session 6: QCD and hadron structure
Parallel
An all new detector, Solenoidal Large Intensity Device (SoLID), has been proposed for the Jefferson Lab 12 GeV era. A wide range of experiments were approved for SoLID. They include parity violation in deep inelastic scattering (PVDIS) to test the Standard Model at low energies, semi-inclusive deep inelastic scattering (SIDIS) to study the parton Transverse Momentum Distributions (TMD),...
Mr
Rainer Schicker
(Phys. Inst., Heidelberg)
20/08/2019, 15:05
Session 6: QCD and hadron structure
Parallel
Central exclusive production at hadron colliders is characterised by the
hadronic state produced at or close to midrapidity, and by the two forward
scattered protons, or remnants thereof. No particles are produced between
the midrapidity system and the forward going beam particles, and such
events can hence be identified experimentally by a double gap topology.
At LHC energies, central...
Dr
Rong Wang
(Institute of Modern Physics, Chinese Academy of Sciences)
20/08/2019, 15:25
Session 6: QCD and hadron structure
Parallel
The kinematical coverage, statistical uncertainties of pion0-DVMP channel on EicC are studied using MC simulation. The detections of the final particles are preliminarily discussed. The low-energy Electron-Ion Collider in China would provide decent statistics of pion0-DVMP events. These data would help constrain the transversity GPDs and the polarized GPDs around small x and small skewness \xi.
Xingbo Zhao
(Institute of Modern Physics, Chinese Academy of Sciences)
20/08/2019, 16:15
Session 6: QCD and hadron structure
Parallel
Field theories quantized on the lightfront have long been considered as a viable framework for hadron structure. In this talk I will give an overview of Basis Lightfront Quantization (BLFQ), a nonperturbative approach to hadron structure and mass spectrum based on the Hamiltonian formalism of the lightfront dynamics and the modern developments in *ab initio* nuclear structure calculations. I...
Dr
Mikhail Malyshev
(PNPI NRC KI)
20/08/2019, 16:40
Session 6: QCD and hadron structure
Parallel
Light Front (LF) QCD Hamiltonian in LF gauge is used semiphenomenologically to describe quark-antiquark bound states. Quarks and gluons are considered as constituent particles and the Hamiltonian is projected onto the Fock space of these constituent particles. Quark and antiquark in these states are separated in transverse coordinates in gauge invariant way by the "string" constracted with...
Chandan Mondal
(Institute of Modern Physics)
20/08/2019, 17:00
Session 6: QCD and hadron structure
Parallel
We investigate the Wigner distributions of the pion using a holographic light-front pion wavefunction with dynamical spin effects to unravel the spatial and spin structure. Using
a universal AdS/QCD scale and constituent quark masses, we find that the dynamical spin effects are maximal in the pion where they lead to an excellent simultaneous description
of a wide range of data: the decay...
Shaoyang Jia
(Iowa State University)
20/08/2019, 17:20
Session 6: QCD and hadron structure
Parallel
We apply the basis light-front quantization framework to solve for the structures of mesons with light and strange valence quarks. Our approach treats mesons as relativistic bound states with quarks confined in both the transverse direction and the light-front longitudinal direction. The spin-orbit interactions of these confined quarks are further specified by the Nambu--Jona-Lasinio model. We...
