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Estimating the production of dark photons with η decay in high-energy collisions

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Chinese Physics C 2024年第10期48卷 150-156页

作者： Wei Kou xurong chen Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Southern Center for Nuclear Science Theory Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

We propose searching for dark photon signals in the decay channel of η mesons,specifically through the leptonic decay(A'→e^(+)e^(-)(μ^(+)μ^(-)))observable in photon-photon interactions during ultra-peripheral heavy-ion *** estimate the total cross-section for dark photon production in ultra-peripheral PbPb collisions at current and future hadron *** findings support the potential for detecting dark photon signals at the LHC,HighLuminosity LHC,High-Energy LHC,and Future Circular Collider.

关键词： dark photon ηdecay ultra-peripheral collision lead-lead collision

Study of transversity GPDs from pseudoscalar mesons production at EIC of China

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Communications in Theoretical Physics 2023年第6期75卷 86-95页

作者： S V Goloskokov Ya-Ping Xie xurong chen Bogoliubov Laboratory of Theoretical Physics Joint Institute for Nuclear ResearchDubna 141980Moscow regionRussia Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

The exclusive η and π^(0)electroproduction is studied in the handbag approach based on the generalized parton distributions(GPDs)*** of π^(0)and η mesons are calculated for future electron-ion collider in China(EicC)energy ranges,using obtained cross sections we extract information on the transversity GPDs contributions to these processes.

关键词： meson production general parton distributions handbag method

A comparison of condensate mass of QCD vacuum between Wilson line approach and Schwinger effect

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Chinese Physics C 2021年第4期45卷 123-129页

作者： Sara Tahery xurong chen Liping Zou Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beiing 100049China Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China

We studied the condensate mass of QCD vacuum through the duality approach via dilaton wall back-ground in the presence of the parameter c,which represents the condensation in a holographic set ***,fromWilson line calculation,we found m_(0)^(2)(i.e.,the condensate parameter in mixed non-local condensation),whose beha-vior mimics that of *** value of m_(0)^(2)that we found by this approach is in agreement with QCD *** we considered the produced mass m via the Schwinger effect mechanism in the presence of the parameter *** show that vacuum condensation generally contributes the mass dominantly and that the produced mass via *** effect is suppressed by m_(0).

关键词： AdS/QCD holographic Schwinger effect gluon condensation of vacuum

Gottfried sum rule from maximum entropy method quark distributions with DGLAP evolution and with DGLAP evolution with GLR-MQ-ZRS corrections

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Chinese Physics C 2018年第10期42卷 25-30页

作者： chengdong Han Qiang Fu xurong chen Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049Chin Lanzhou University Lanzhou 730000China

A new method to test the valence quark distribution of nucleons obtained from the maximum entropy method using the Gottfried sum rule by performing the DGLAP equations with GLR-MQ-ZRS corrections and the original leading-order/next-to-leading-order （LO/NLO） DGLAP equations is outlined. The test relies on knowledge of the unpolarized electron proton structure function F2^ep and the electron neutron structure function F2^en and the assumption that Bjorken scaling is satisfied. In this work, the original Gottfried summation value obtained by the integrals of the structure function at different Q2 is in accordance with the theoretical value of 1/3 under the premise of light-quark flavor symmetry of the nucleon sea, whether it results from dynamical evolution equations or from global quantum chromodynamics fits of PDFs. Finally, we present the summation value of the LO/NLO DGLAP global fits of PDFs under the premise of light-quark flavor asymmetry of the nucleon sea. According to analysis of the original Gottfried summation value with two evolution equations at different Q2 we find that the valence quark distributions of nucleons obtained by using the maximum entropy method are effective and reliable.

关键词： Gottfired sum rule DGLAP-GLR-MQ-ZRS equations DGLAP equations deviation

Exploring the impact of anti-shadowing effect on unintegrated gluon distributions in the MD-BFKL equation

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Chinese Physics C 2024年第9期48卷 126-132页

作者： Xiaopeng Wang Yanbing Cai xurong chen Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology Lanzhou UniversityLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China Guizhou Key Laboratory in Physics and Related Areas Guizhou University of Finance and EconomicsGuiyang 550025China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

This paper presents a comprehensive analysis of the MD-BFKL equation,considering both shadowing and anti-shadowing effects in gluon recombination *** deriving analytical expressions for unintegrated gluon distributions through the solution of the MD-BFKL equation,with and without the incorporation of the antishadowing effect,we offer new insights into the influence of these effects on the behavior of unintegrated gluon *** results,when compared to those from the CT18NLO gluon distribution function,demonstrate that the anti-shadowing effect has a notably stronger impact on the characteristics of unintegrated gluon distributions,particularly in regions of high rapidity and *** work significantly contributes to the understanding of gluon recombination mechanisms and their implications in high energy physics.

关键词： MD-BFKL equation analytic solution anti-shadowing effect

Tackling the kaon structure function at EicC

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Chinese Physics C 2022年第6期46卷 192-202页

作者： Gang Xie chengdong Han Rong Wang xurong chen Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China

Measuring the kaon structure beyond proton and pion structures is a prominent topic in hadron physics,as it is one way to understand the nature of the Nambu-Goldstone boson of QCD and observe the interplay between the EHM and HB mechanisms for hadron mass *** this study,we present a simulation of the leading A baryon tagged deep inelastic scattering experiment at EicC(Electron-ion collider in China),which is engaged to unveil the internal structure of kaon via the Sullivan *** to our simulation results,the suggested experiment will cover the kinematical domain of 0.05≤xK≤0.85 and Q^(2)up to 50 GeV^(2),with the acceptable statistical *** the relatively low-Q^(2) region(<10 GeV^(2)),the Monte-Carlo simulation shows a good statistical precision(<5%)for the measurement of the kaon structure function *** the high-Q^(2) region(up to 50 GeV^(2)),the statistical uncertainty of F_(2)^(K) is also acceptable(<10%)for the data at xK<*** perform such an experiment at an electron-ion collider,a high-performance zero-degree calorimeter is *** magnitude of the background process and the assumed detector capabilities are also discussed and illustrated in the paper.

关键词： kaon structure function electron-ion collider parton distribution function tagged deep inelastic scattering

Production of vector mesons in pentaquark state resonance channel in p-A ultraperipheral collisions

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Chinese Physics C 2021年第1期45卷 280-285页

作者： Ya-Ping Xie Xiao-Yun Wang xurong chen Institute of Modem Physics Chinese Academy of SciencesLanzhou 730000China Department of physics Lanzhou University of TechnologyLanzhou 730050China University of Chinese Academy of Sciences Beijing 100049China Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

Ultraperipheral collisions(UPCs) of protons and nuclei are important for the study of the photoproduction of vector mesons and exotic *** photoproduction of vector mesons in the pentaquark resonance channel in p-Au UPCs at the Relative Heavy Ion Collider(RHIC) and p-Pb UPCs at the Large Hadron Collider(LHC) is investigated by employing the STARlight *** cross sections of vector mesons via the pentaquark state resonance channel are obtained using the effective Lagrangian *** pseudo-rapidity and rapidity distributions of J/Ψ and γ(1 S) are given for p-Au UPCs at the RHIC and p-PbUPCs at the *** is found that the RHIC is a better platform for discovering pentaquark states than the ***,Pb(11080) is easier to identify than PC(4312) because the background of γ(1 S) is weaker than that of J/Ψ in the t-channel at the RHIC.

关键词： ultraperipheral collisions pentaquark states photoproduction

Exclusive π^(0) production at EIC of China within handbag approach

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Chinese Physics C 2022年第12期46卷 50-57页

作者： S.V.Goloskokov Ya-Ping Xie xurong chen Laboratory of Theoretical Physics Joint Institute for Nuclear ResearchDubna 141980MoscowRussia Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

Exclusive π^(0) electroproduction is analyzed within the handbag approach based on Generalized Parton Distribution(GPDs)*** consider the leading-twist contribution together with the transversity *** is shown that the transversity GPDs H_(T) and E_(T) are essential in the description of the π^(0) cross *** for the future Electron-Ion Collider of China(EicC)energy range are *** is found that transversity dominanceσ_(T)>>σ_(L),observed at low energies,is valid up to the EicC energy range.

关键词： general parton distributions nucleon structure deep virtual meson production

Production of hidden-charm and hidden-bottom pentaquark states in electron-proton collisions

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Chinese Physics C 2021年第4期45卷 107-113页

作者： Ya-Ping Xie Xu Cao Yu-Tie Liang xurong chen Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China Institute of Quantum Matter South China Normal UniversityGuangzhou 510006China

Electro-production of several pentaquark states is investigated in this *** eSTARlight package is adapted to study the electro-production of J/ψand γ(1S)via pentaquark P_(c)and P_(b)resonance channels in ep→eJ/ψp and ep→eγ(1S)p scattering processes at the proposed electron-ion colliders(EICs).The results obtained in this study are compared to those of non-resonance t-channels,which are described in the pomeron exchange model developed in our *** pseudo-rapidity and rapidity distributions of J/ψand γ(1S)are presented for the proposed EICs,including EicC and *** is found that EicC is a good platform to identify P_(b) states in the future.

关键词： electron-proton scattering exotic states vector meson production