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Does nuclear medium affect the transverse momentum-dependent parton distributions of valence quark of pions?

PHYSICS LETTERS B 2024年 859卷

作者： Kaur, Navpreet Puhan, Satyajit Pandey, Reetanshu Kumar, Arvind Dutt, Suneel Dahiya, Harleen Dr BR Ambedkar Natl Inst Technol Dept Phys Computat High Energy Phys Lab Jalandhar 144008 Punjab India

We calculate the valence quark transverse momentum-dependent parton distributions (TMDs) of the lightest pseudoscalar meson, pions, in isospin asymmetric nuclear matter at zero temperature by employing a light-cone quark model. The medium modifications in the pion unpolarized TMDs are induced through the effective quark masses computed using the chiral SU(3) quark mean field model. The spin densities at different momentum fraction (x) have also been calculated at different baryonic densities.

关键词： Transverse momentum parton distribution functions Medium modifications parton distribution functions Spin densities

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Impact of the LHCb 8 W, Z, and asymmetry data on the CT14HERA2 PDFs

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CHINESE JOURNAL OF PHYSICS 2024年 89卷 1-15页

作者： Rashidin, Reyima Ablimit, Abdughupur Fan, Honghao Dulat, Sayipjamal Xinjiang Univ Sch Phys Sci & Technol Urumqi 830046 Xinjiang Peoples R China

First, we calculate the total cross-sections and differential cross-sections of the W and Z productions at next-to-leading order QCD using ResBos and CT14HERA2 PDFs, and compare with the measurements from the LHCb detector at a center-of-mass energy of 8 TeV and find good agreement between the experimental data and theoretical predictions. Then, we analyze the impact of LHCb 8 TeV W, Z and asymmetry data on CT14HERA2 PDFs(d(x,Q),a(x,Q),d(x,Q),/(x,Q),/u(x,Q),d(x,Q)/u(x,Q)) using the Error PDF Updating Method Package. Through this analysis, we find that the LHCb 8 TeV.. and.. data prefer softer gloun and..(x,Q) at large.. region, but have no significant impacts onu u(x,Q) PDF.

关键词： parton distribution functions W and Z boson production

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Searching for a_(0)(980)-meson parton distribution function

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Communications in Theoretical Physics 2023年第8期75卷 111-118页

作者： Zai-Hui Wu Hai-Bing Fu Tao Zhong Yu Chen Ya-Hong Dai Department of Physics Guizhou Minzu UniversityGuiyang 550025China

In this paper,we calculate the scalar a_(0)(980)-meson leading-twist wave function by using the light-cone harmonic oscillator model(LCHO),where the model parameters are determined by fitting theξ-moments■of its light-cone distribution ***,the a_(0)(980)-meson leading-twist light-cone distribution amplitudes with three different scalesζ=(1.0,2.0,5.2)Ge V are *** constructing the relationship between the a_(0)(980)-meson leading-twist parton distribution functions/valence quark distribution function and its LCHO wave function,we exhibit the■(x,ζ)and■(x,ζ)with different ***,we also calculate the Mellin moments of the a_(0)(980)-meson’s valence quark distribution function■with n=(1,2,3),i.e.■=0.027,■=0.018 and■=***,the scale evolution for the ratio of the Mellin moments x■are presented.

关键词： parton distribution functions light-cone distribution amplitudes light scalar meson light-cone harmonic oscillator model

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The inclusion of theory errors in PDF fits

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Nuclear and Particle Physics Proceedings 2024年 343卷 17-22页

作者： Barontini, Andrea University of Milan Italy INFN Milan Italy

We present ongoing work towards incorporating the missing higher-order uncertainty (MHOU) determined through scale variations in the assessment of parton distribution functions (PDFs). Our PDFs fitting employs the NNPDF4.0 methodology and our theory covariance matrix framework to account for theory errors. This approach relies on the integration of MHOUs and their correlations via a theory covariance matrix. We validate our estimation and assess the impact of theory errors on the PDFs and on LHC phenomenology. © 2023 The Author(s)

关键词： MHOU NNPDF parton distribution functions Theory errors

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Regularization dependence of pion generalized parton distributions

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Chinese Physics C 2022年第6期46卷 66-87页

作者： Jin-Li Zhang Guang-Zhen Kang Jia-Lun Ping Department of Physics Nanjing Normal UniversityNanjing 210023China School of Science Yangzhou Polytechnic InstituteYangzhou 225127China

Pion generalized parton distributions are calculated within the framework of the Nambu-Jona-Lasinio model using different regularization schemes,including the proper time regularization scheme,the three-dimensional(3D)momentum cutoff scheme,the four-dimensional momentum cutoff scheme,and the Pauli-Villars regularization ***,we check the theoretical constraints of pion generalized parton distributions required by the symmetries of quantum chromodynamics in different regularization *** diagrams of pion parton distribution functions are plotted,in addition,we evaluate the Mellin moments of generalized parton distributions,which are related to the electromagnetic and gravitational form factors of *** generalized parton distributions are continuous but not differential at x=±ξ,when considering the effect of the contact contribution term,generalized parton distributions become not continuous at x=±ξin all the four regularization *** parton distributions in impact parameter space are considered,the width distribution of u quark in the pion and the meansquaredπu are *** light-front transverse-spin distributions are studied when quark polarized in the light-front-transverse+x direction,the transverse-spin density is no longer symmetric around(bx=0,by=0),the peaks shift to(bx=0,by>0),we compare the average transverse shift1u and2u in different regularization *** light-cone energy radius rE,LC and the light-cone charge radius rc,LC are also evaluated,we found that in the proper time regularization scheme the values of these quantities were the largest,in the 3 D momentum cutoff scheme they were the smallest.

关键词： generalized parton distributions form factors parton distribution functions

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Modification of Quark-Gluon distributions in Nuclei by Correlated Nucleon Pairs

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Physical Review Letters 2024年第15期133卷 152502页

作者： A. W. Denniston T. Ježo A. Kusina N. Derakhshanian P. Duwentäster O. Hen C. Keppel M. Klasen K. Kovařík J. G. Morfín K. F. Muzakka F. I. Olness E. Piasetzky P. Risse R. Ruiz I. Schienbein J. Y. Yu. Cambridge Massachusetts 02139 USA Institut für Theoretische Physik PL-31342 Krakow Poland Department of Physics P.O. Box 35 FI-40014 University of Jyväskylä Finland P.O. Box 64 FI-00014 University of Helsinki Finland Newport News Virginia 23606 USA School of Physics Batavia Illinois 60510 USA Institut für Energie- und Klimaforschung Department of Physics School of Physics and Astronomy Université Grenoble-Alpes CNRS/IN2P3 53 avenue des Martyrs 38026 Grenoble France

We extend the QCD parton Model analysis using a factorized nuclear structure model incorporating individual nucleons and pairs of correlated nucleons. Our analysis of high-energy data from lepton deep-inelastic scattering, Drell-Yan, and W and Z boson production simultaneously extracts the universal effective distribution of quarks and gluons inside correlated nucleon pairs, and their nucleus-specific fractions. Such successful extraction of these universal distributions marks a significant advance in our understanding of nuclear structure properties connecting nucleon- and parton-level quantities.

关键词： Nuclear structure & decays parton distribution functions QCD in nuclear reactions

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New Data-Driven Constraints on the Sign of Gluon Polarization in the Proton

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Physical Review Letters 2024年第16期133卷 161901页

作者： N. T. Hunt-Smith C. Cocuzza W. Melnitchouk N. Sato A. W. Thomas M. J. White CSSM and ARC Centre of Excellence for Dark Matter Particle Physics Department of Physics Department of Physics Newport News Virginia 23606 USA

Recently, the possible existence of negative gluon helicity Δg has been observed to be compatible with existing empirical constraints, including from jet production in polarized proton-proton collisions at the Relativistic Heavy Ion Collider, and lattice QCD data on polarized gluon Ioffe time distributions. We perform a new global analysis of polarized parton distributions in the proton with new constraints from the high-x region of deep-inelastic scattering (DIS). A dramatic reduction in the quality of the fit for the negative Δg replicas compared to those with positive Δg suggests that the negative Δg solution cannot simultaneously account for high-x polarized DIS data along with lattice and polarized jet data.

关键词： Lattice QCD parton distribution functions QCD phenomenology Quantum chromodynamics Nucleon spin structure Lattice field theory Lattice gauge theory

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Counting linearly polarized gluons with lattice QCD

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Physical Review D 2024年第1期109卷 014002-014002页

作者： Shuai Zhao Department of Physics Tianjin University Tianjin 300350 China Department of Physics Old Dominion University Norfolk Virginia 23529 USA and Theory Center Thomas Jefferson National Accelerator Facility Newport News Virginia 23606 USA

We outline an approach to calculate the transverse-momentum-dependent distribution of linearly polarized gluons inside an unpolarized hadron on the lattice with the help of large momentum effective theory. To achieve this purpose, we propose calculating a Euclidean version of the degree of polarization for a fast-moving hadron on the lattice, which is ultraviolet finite, and no soft function subtraction is needed. It indicates a practical way to explore the distribution of the linearly polarized gluons in a proton and the linearly polarized gluon effects in hadron collisions on the lattice.

关键词： parton distribution functions Perturbative QCD Hadrons Polarization Lattice QCD

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Quark and gluon distributions in ρ-meson from basis light-front quantization

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PHYSICS LETTERS B 2024年 851卷

作者： Kaur, Satvir Wu, Jiatong Hu, Zhi Lan, Jiangshan Mondal, Chandan Zhao, Xingbo Vary, James P. Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China Univ Chinese Acad Sci Sch Nucl Sci & Technol Beijing 100049 Peoples R China Chinese Acad Sci Inst Modern Phys CAS Key Lab High Precis Nucl Spect Lanzhou 730000 Peoples R China High Energy Accelerator Res Org KEK Ibaraki 3050801 Japan Iowa State Univ Dept Phys & Astron Ames IA 50011 USA

We solve for the rho-meson's wave functions from a light-front QCD Hamiltonian determined for its constituent quark-antiquark and quark-antiquark-gluon Fock components, with a three-dimensional confinement using basis light-front quantization. From this, we obtain the leading-twist valence quark's parton distribution functions and transverse momentum-dependent parton distributions inside the rho-meson. These results are qualitatively consistent with those of other models. We also demonstrate the important effects of a dynamical gluon on the rho-meson's gluon densities, helicity, transversity, and tensor polarized distributions.

关键词： Light-front quantization rho-meson parton distribution functions

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Topological heavy-flavor tagging and intrinsic bottom at the Electron-Ion Collider

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Physical Review D 2024年第9期109卷 092010-092010页

作者： Thomas Boettcher Department of Physics University of Cincinnati Cincinnati 45221 OH United States

Heavy-flavor hadron production, in particular bottom hadron production, is difficult to study in deep-inelastic scattering (DIS) experiments due to small production rates and branching fractions. To overcome these limitations, a method for identifying heavy-flavor DIS events based on event topology is proposed. Based on a heavy-flavor jet tagging strategy developed for the LHCb experiment, this algorithm uses displaced vertices to identify decays of heavy-flavor hadrons. The algorithm’s performance at the Electron-Ion Collider is demonstrated using simulation, and it is shown to provide discovery potential for nonperturbative intrinsic bottom quarks in the proton.

关键词： Bottom quark production parton distribution functions QCD phenomenology Quantum chromodynamics Signatures with bottom quarks

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