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Next-to-leading order QCD corrections to Higgs boson decay to quarkonium plus a photon

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Chinese Physics C 2016年第12期40卷 46-51页

作者： Chao Zhou Mao Song Gang Li Ya-Jin Zhou Jian-You Guo School of Physics and Material Science Anhui University Hefei 230601 China School of Physics Shandong University Jinan 250100 China

In this paper, we investigate the decay of the Higgs boson to J/ψ（γ ） plus a photon based on NRQCD factorization. For the direct process, we calculate the decay width up to QCD NLO. We find that the decay width for process H → J/ψ（γ ）＋γ direct production at the LO is significantly reduced by the NLO QCD corrections. For the indirect process, we calculate the H→γ＊γ, with virtual 7 substantially decaying to J/ψ（γ）, including all the SM Feynman diagrams. The decay width of indirect production is much larger than the direct decay width. Since it is very clean in experiment, the H →J/ψ（ γ）＋γ decay could be observable at a 14 TeV LHC and it also offers a new way to probe the Yukawa coupling and New Physics at the LHC.

关键词： Higgs boson heavy quarkonium NLO QCD

Relativistic correction to gluon fragmentation function into pseudoscalar quarkonium

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Chinese Physics C 2017年第2期41卷 55-63页

作者：高祥瑞贾宇李留记熊小努 Institute of High Energy Physics and Theoretical Physics Center for Science Facilities Chinese Academy of Sciences Center for High Energy Physics Peking University Istituto Nazionale di Fisica Nucleare Sezione di Pavia

Inspired by the recent measurements of the ηc meson production at LHC experiments, we investigate the relativistic correction effect for the fragmentation functions of gluon/charm quark fragmenting into ηc, which constitute the crucial nonperturbative element for the ηc production at high pT. Employing three distinct methods,we calculate the next-to-leading-order（NLO） relativistic correction to g →ηc fragmentation function in the NRQCD factorization framework, as well as verifying the existing NLO result for the c →ηc fragmentation function. We also study the evolution behavior of these fragmentation functions with the aid of the DGLAP equation.

关键词： QCD heavy quarkonium fragmentation function DGLAP equation

Fast heating dissociation of Υ(1S) in heavy ion collisions at RHIC

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Chinese Physics C 2020年第12期44卷 158-162页

作者： Yunpeng Liu Baoyi Chen Department of Applied Physics School of ScienceTianjin UniversityTianjin 300072China

By adopting the adiabatic assumption in the cooling process,we discuss a novel mechanism ofΥ(1S)suppression that occurs due to the fast heating process at the early stage of the fireball,instead of its finite decay width in a finite temperature medium generated by heavy ion *** calculate the transition probability after the fast heating dissociation as a function of the temperature of the medium and the nuclear modification factor in central collisions and find that the suppression is not negligible at RHIC,even if the width ofΥ(1S)becomes zero.

关键词： relativistic heavy-ion collision quark-gluon plasma heavy quarkonium adiabatic theorem

J/ψ inclusive production in χbJ(nP) decays

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Chinese Physics C 2010年第7期34卷 929-936页

作者：李荣何志国 Department of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Institute of High Energy Physics Chinese Academy of Science Theoretical Physics Center for Science Facilities (CAS)

We study J/ψ inclusive production in the decays of P-wave bottomonium χbJ（1P,2P） for J=0,1,2. Within the framework of the non-relativistic QCD（NRQCD） factorization method we calculate the contri-butions coming from four relevant processes including one color-singlet process and three color-octet ones,which are b（3PJ,1） → c（3S1,8）＋ c ＋,b（3S1,8） → c（3S1,1）＋ g ＋ g,b（3S1,8） → c（3S1,1）＋ c ＋ and b（3S1,8） → c（3S1,8）＋g. Our calculation shows that the color-octet processes,especially the gluon fragmen-tation one,contribute the most in the decays of χb0 and χb1. However,the J/ψ production in the χb2 decay is dominated by the color-singlet process. Furthermore,the gluon fragmentation process gives a δ function in the energy fraction distribution of J/ψ,which can be considered to be another characteristic for its identification. From our estimation the branching ratio for these processes is about 10-4-10-5,which indicates that J/ψ inclusive production is detectable at B-factories. Studying these processes would help us to gain a deeper understanding of the color-octet mechanism.

关键词： NRQCD heavy quarkonium inclusive decay

Complete study on polarization of γ(nS) hadroproduction at QCD next-to-leading order

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Chinese Physics C 2021年第1期45卷 187-195页

作者： Yu Feng Bin Gong Chao-Hsi Chang Jian-Xiong Wang Department of Physics College of Basic Medical SciencesArmy Medical UniversityChongqing 400038China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Institute of High Energy Physics Chinese Academy of SciencesP.O.Box 918(4)Beijing 100049China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100190China

By applying the nonrelativistic quantum chromodynamics factorization formalism toγ(1S.2S,3S)hadroproduction,a complete analysis of the polarization parametersλθ,λθФ、andλФfor the production is presented at QCD next-to-leading *** the long-distance matrix elements extracted from experimental data for the production rate and polarization parameterλθofγhadroproduction,our results provide a good description of the measured parametersλθФandλФin both the helicity and Collins-Soper *** our calculations,the frame invariant parameterλ^-is consistent in the two ***,we mention that there are discrepancies between the available experimental data and corresponding theoretical predictions forλ^-.

关键词： heavy quarkonium polarization NRQCD

Next-to-leading-order relativistic and QCD corrections to prompt J/ψpair photoproduction at future e^(+)e^(−)colliders

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Chinese Physics C 2024年第8期48卷 104-112页

作者： Zhi-Guo He Xiao-Bo Jin Bernd A.Kniehl Rong Li Department of Physics and Electronics School of Mathematics and PhysicsBeijing University of Chemical TechnologyBeijing 100029China II.Institut für Theoretische Physik Universität HamburgLuruper Chaussee 14922761 HamburgGermany Institut für Theoretische Physik Universität Regensburg93040 RegensburgGermany Center of Advanced Quantum Studies Department of PhysicsBeijing Normal UniversityBeijing 100875China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China Institute of Theoretical Physics Xi’an Jiaotong UniversityXi’an 710049China

Within the framework of nonrelativistic-QCD factorization,we calculate both the next-to-leading-order relativistic and QCD corrections to prompt J/ψpair production,with feed-down fromψ(2S)mesons,via photon-photon collisions at future e^(+)e^(−)colliders,including the Future Circular Lepton Collider(FCC-ee),the Circular Electron Positron Collider(CEPC),and the Compact Linear Collider(CLIC).We present total cross sections and distributions in single J/ψtransverse momentum and rapidity,as well as in J/ψpair invariant *** relativistic and QCD corrections both turn out to be large and ***,the production rates are large enough for useful experimental studies.

关键词： heavy quarkonium perturbative calculation two-photon collisions

Inclusive γ(1S,2S,3S) photoproduction at the CEPC

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Chinese Physics C 2021年第2期45卷 240-245页

作者： Xi-Jie Zhan Jian-Xiong Wang Institute of High Energy Physics(IHEP) Chinese Academy of Sciences(CAS)19B Yuquan RoadShijingshan DistrictBeijing100049China University of Chinese Academy of Sciences(UCAS) Chinese Academy of Sciences(CAS)19A Yuquanlu RoadShijingshan DistrictBeijing100049China

Inclusive γ(1S,2S,3S) photoproduction at the future Circular-Electron-Positron-Collider(CEPC)is studied,using the non-relativistic quantum chromodynamics(NRQCD)factorization *** the contributions from both direct and resolved photons,we present different distributions for the γ(1S,2S,3S) *** results suggest that there will be considerable events,implying that well measurements of the T photoproduction can be performed to further study heavy quarkonium physics at electron-positron colliders,in addition to hadron *** supplemental study is very important for clarifying the current situation regarding the heavy quarkonium production mechanism.

关键词： NRQCD heavy quarkonium photoproduction e^+e^-collider

On the Next-leading order heavy-Quark Potential from AdS/CFT

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Chinese Physics C 2010年第9期34卷 1355-1359页

作者：初少霞侯德富任海沧 Institute of Particle Physics Huazhong Normal University Physics Department The Rockefeller University

Applying the AdS/CFT correspondence,the expansion of the heavy-quark potential of N = 4 supersymmetric Yang-Mills theory at large N c is carried out to the next-leading term in the large ’t Hooft coupling at zero *** strong coupling corresponds to the semi-classical expansion of the stringsigma model,the gravity dual of the Wilson loop operator,with the next-leading term expressed in terms of functional determinants of *** singularities of these determinants are examined and their contributions are evaluated *** find the next-leading order correction is negative and suppressed by minus square root of the ’t Hooft coupling relative to the leading order.

关键词： holographic QCD heavy quarkonium

通过相对论重粒子碰撞中的J/ψ产生揭秘胶子喷注淬火机制

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Science Bulletin 2023年第18期68卷 2003-2009,M0003页

作者：张善良廖劲峰秦广友王恩科邢宏喜 Key Laboratory of Atomic and Subatomic Structure and Quantum Control(MOE) Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China Guangdong Provincial Key Laboratory of Nuclear Science Institute of Quantum MatterSouth China Normal UniversityGuangzhou 510006China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Southern Nuclear Science Computing CenterSouth China Normal UniversityGuangzhou 510006China Physics Department and Center for Exploration of Energy and Matter Indiana UniversityBloomington 47408USA Key Laboratory of Quark&Lepton Physics(MOE)and Institute of Particle Physics Central China Normal UniversityWuhan 430079China Southern Center for Nuclear-Science Theory(SCNT) Institute of Modern PhysicsChinese Academy of SciencesHuizhou 516000China

长久以来,喷注淬火被认为是探测重离子碰撞中形成的夺克胶子等离子体的关键信号之一,尽管过去在喷注火研究方面已经付出了巨大的努力、但是区分夸克和胶子的喷注淬火仍然是一个非常大的挑战本文发现大横动量J/主要由胶子碎裂产生,因此... 详细信息

长久以来,喷注淬火被认为是探测重离子碰撞中形成的夺克胶子等离子体的关键信号之一,尽管过去在喷注火研究方面已经付出了巨大的努力、但是区分夸克和胶子的喷注淬火仍然是一个非常大的挑战本文发现大横动量J/主要由胶子碎裂产生,因此为探测胶子在热密介质中的能量损失提供了一个独特的敏感探针,作者首先基于领头幂次的NRQCD因子化理论计算了质子-质子碰撞中的大横动量J/产生,发现胶子碎裂是大横动量J/产生的主要机制,然后通过线性玻尔兹曼输运模型和相对论流体力学模拟了核-核碰撞中喷注与热密介质的相互作用,所得数值结果很好地描述了大横动量J/的核修正因子和椭圆流,揭示出胶子能量损失是大横动量J/产额压低的主要机制。作者进一步通过数据驱动的贝叶斯分析方法证实了这个新颖的结论,并定量提取出夸克胶子等离子体中的胶子能量损失分布。

关键词： Relativistic heavy-ion collisions heavy quarkonium Jet quenching Elliptic flow