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Exclusive Charmonium Photo-Production at HERA and LHC with Color Glass Condensate
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作者 蔡燕兵 杨毅 +1 位作者 周代翠 向文昌 《Chinese Physics Letters》 SCIE CAS CSCD 2017年第12期16-20,共5页
We calculate the exclusive charmonium photo-production in the framework of color glass condensate.To obtain a good description of the vector meson production experimental data at HERA,we introduce a vector meson mass ... We calculate the exclusive charmonium photo-production in the framework of color glass condensate.To obtain a good description of the vector meson production experimental data at HERA,we introduce a vector meson mass dependent skewness factor into the skewness effect.Then we extend the skewness improved model to the LHC energies.The numerical results of our model are in good agreement with theΨ/Ψ and Ψ(2S)data in ultraperipheral proton-proton collisions at LHC,which show the significance of the vector meson mass-dependent skewness factor.A prediction of the exclusive charmonium photo-production in ultra-peripheral nucleus-nucleus collisions is performed since it can provide a good way to test the effectiveness of the color glass condensate. 展开更多
关键词 LHC Exclusive Charmonium Photo-Production at HERA and LHC with color glass condensate Pb
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Exclusive photoproduction of vector meson at next-to-leading order from color glass condensate 被引量:4
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作者 Yanbing Cai Wenchang Xiang +1 位作者 Mengliang Wang Daicui Zhou 《Chinese Physics C》 SCIE CAS CSCD 2020年第7期167-178,共12页
The exclusive photoproduction of vector mesons(J/ψ/andφ)is investigated by considering the next-toleading order corrections in the framework of the color glass condensate.We compare the next-to-leading order modifie... The exclusive photoproduction of vector mesons(J/ψ/andφ)is investigated by considering the next-toleading order corrections in the framework of the color glass condensate.We compare the next-to-leading order modified dipole amplitude with the HERA data,finding a good agreement.Our studies show that theχ~2/d.o.f from the leading order,running coupling,and collinearly improved next-to-leading order dipole amplitudes are 2.159,1.097,and 0.932 for the elastic cross-section,and 2.056,1.449,and 1.357 for the differential cross-section,respectively.The results indicate that the higher-order corrections contribute significantly to the vector meson productions,and the description of the experimental data is dramatically improved once the higher order corrections are included.We extend the next-to-leading order exclusive vector meson production model to LHC energies using the same parameters obtained from HERA.We find that our model provides a rather good description of the J/ψandΦdata in proton-proton collisions at 7 TeV and 13 TeV in LHCb experiments. 展开更多
关键词 color glass condensate vector meson production exclusive processes
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Light Vector Mesons Production in Ultrarelativistic Heavy Ion Collisions from the Color Glass Condensate
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作者 余功明 杨海涛 李云德 《Communications in Theoretical Physics》 SCIE CAS CSCD 2015年第12期683-686,共4页
We calculate inclusive light vector mesons(ρ,ω,and φ) production in relativistic heavy ion collisions based on the idea of gluon saturation in the color glass condensate(CGC) framework.At high energies,the value of... We calculate inclusive light vector mesons(ρ,ω,and φ) production in relativistic heavy ion collisions based on the idea of gluon saturation in the color glass condensate(CGC) framework.At high energies,the value of saturation momentum becomes larger than the Quantum Chromodynamics(QCD) confinement scale ∧_(QCD),which implies thatα_s(Q_s) <<1.Using the relativistic kinetic theory,we derive the production rate for the light vector mesons produced by gluon-gluon fusion in the k_T-factorization approach.The numerical results indicate that the light vector mesons from the color glass condensate become prominent in p-p,p-Pb,and Pb-Pb collisions at Large Hadron Collider(LHC) energies. 展开更多
关键词 light VECTOR MESON color glass condensate relativi
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高能极限下部分子饱和及部分子演化规律研究
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作者 胡志海 许江勇 李丹 《贵州师范大学学报(自然科学版)》 CAS 2015年第2期61-65,共5页
基于Mueller的偶极子理论框架,研究了高能部分子随快度的演化规律,计算了高能部分子的劈裂几率。本文采用一个新颖的近似方法,简化了部分子演化方程,并计算出了该方程在饱和区域中的解析解,本文的研究为理论上建立电子-质子和质子-核散... 基于Mueller的偶极子理论框架,研究了高能部分子随快度的演化规律,计算了高能部分子的劈裂几率。本文采用一个新颖的近似方法,简化了部分子演化方程,并计算出了该方程在饱和区域中的解析解,本文的研究为理论上建立电子-质子和质子-核散射模型提供了有力的保障,为实验上解释电子-质子和质子-核散射实验数据提供了理论基础。 展开更多
关键词 胶子饱和 色玻璃凝聚 偶极子模型
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电子-质子散射中几何标度效应的研究
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作者 周晓娇 齐恋 刘万松 《贵州师范大学学报(自然科学版)》 CAS 2015年第1期113-115,120,共4页
在色玻璃凝聚理论框架下,我们对x≤0.01情况下电子-质子深度非弹性散射中新联合实验数据进行全局分析,研究能在全局τ区间内描述几何标度效应。利用新联合实验数据验证了理论上预言的几何标度效应,研究结果显示在高能情况下色玻璃凝聚... 在色玻璃凝聚理论框架下,我们对x≤0.01情况下电子-质子深度非弹性散射中新联合实验数据进行全局分析,研究能在全局τ区间内描述几何标度效应。利用新联合实验数据验证了理论上预言的几何标度效应,研究结果显示在高能情况下色玻璃凝聚态存在的可能性。 展开更多
关键词 色玻璃凝聚 GBW模型 几何标度效应
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J/ψ production in p+p and p+Pb collisions at ultrarelativistic energies 被引量:2
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作者 Hong-Min Wang Zhao-Yu Hou +1 位作者 Xiu-Ting Wang Xian-Jing Sun 《Nuclear Science and Techniques》 SCIE CAS CSCD 2018年第8期179-185,共7页
The production of J/ψ mesons in p+p and p+Pb collisions is studied in the framework of color-glass condensate together with a simple color evaporation model.Considering the nuclear effects with the Glauber–Gribov ap... The production of J/ψ mesons in p+p and p+Pb collisions is studied in the framework of color-glass condensate together with a simple color evaporation model.Considering the nuclear effects with the Glauber–Gribov approach,we calculate the cross section and the nuclear modification factor of forward J/ψ production in p+Pb collisions at s^(1/2) 5:02 TeV.Then,the backward J/ψ production in p+Pb collisions at s^(1/2) 8:16 Te V is also analyzed.In our calculation,the phenomenology KLRAd S/CFT model and the rc BK approach,which are valid at a small x,are used to calculate the three-point function.It is shown that the theoretical results fit well with the experimental data from ALICE and LHCb. 展开更多
关键词 碰撞 生产 GLAUBER 精力 J/Ψ 修正因素 冷凝物 现象学
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色玻璃凝聚理论中跑动耦合常数效应研究
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作者 向文昌 王梦亮 +1 位作者 蔡燕兵 周代翠 《华中师范大学学报(自然科学版)》 CAS CSCD 北大核心 2022年第4期585-593,共9页
在色偶极子模型下,该文研究了4种跑动耦合常数方案对偶极子散射振幅演化的影响.通过数值解共线改进的Balitsky-Kovchegov演化方程,获得数值形式的偶极子散射振幅,结合光子波函数,对HERA能区光子-质子深度非弹性散射实验数据开展了拟合研... 在色偶极子模型下,该文研究了4种跑动耦合常数方案对偶极子散射振幅演化的影响.通过数值解共线改进的Balitsky-Kovchegov演化方程,获得数值形式的偶极子散射振幅,结合光子波函数,对HERA能区光子-质子深度非弹性散射实验数据开展了拟合研究,结果显示4种方案中的Balitsky方案给出较合理的实验数据描述,χ^(2)/d.o.f=1.171且自由参数C^(2)=0.326接近其理论值,由此可知其为较优的方案.此外,为了显示次领头阶跑动耦合常数效应的重要性,该文还对同一组实验数据采用领头阶和共线改进的散射振幅进行了对比研究,结果显示无论4种跑动耦合常数方案中的拟合参数怎么变化,领头阶散射振幅都无法对相应数据进行合理描述,结果表明跑动耦合常数效应对压低偶极子的演化有着重要的作用. 展开更多
关键词 色玻璃凝聚 胶子饱和物理 跑动耦合常数
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Sudakov压低的Balitsky-Kovchegov方程在重夸克产生中的应用研究
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作者 向文昌 蔡燕兵 +1 位作者 王梦亮 党蕊娜 《华中师范大学学报(自然科学版)》 CAS CSCD 北大核心 2022年第6期942-947,共6页
在色偶极子模型框架下,该文首次采用Sudakov压低的Balitsky-Kovchegov演化方程研究HERA能区粲夸克和底夸克的产生.通过数值方法求解微分积分形式的Balitsky-Kovchegov方程,获取Sudakov压低的散射振幅,结合虚光子劈裂成正反夸克对的波函... 在色偶极子模型框架下,该文首次采用Sudakov压低的Balitsky-Kovchegov演化方程研究HERA能区粲夸克和底夸克的产生.通过数值方法求解微分积分形式的Balitsky-Kovchegov方程,获取Sudakov压低的散射振幅,结合虚光子劈裂成正反夸克对的波函数,开展电子-质子深度非弹性散射中重夸克产生约化截面研究.为了避免过度拟合,该文将前期研究中获得的模型参数直接应用于描述粲夸克和底夸克的产生,不再对粲夸克和底夸克的约化截面数据进行单独拟合,结果显示Sudakov压低了的散射振幅较领头阶散射振幅给出了更符合实验测量的描述效果,由此表明Sudakov压低效应对重夸克的产生有着重要的作用. 展开更多
关键词 色玻璃凝聚 Sudakov压低的Balitsky-Kovchegov方程 重夸克产生
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深度非弹性散射实验数据中坡密子圈效应研究(英文)
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作者 胡元元 杨毅 沈光先 《贵州师范大学学报(自然科学版)》 CAS 2018年第2期86-95,共10页
采用来自坡密子圈方程的衍射标度效应,研究最新实验数据中的坡密子圈效应。用质量因子的方法分析最新的HERA实验数据,得到了饱和指数λ=0.208,该指数与理论预言相一致。为了直观的显示衍射标度效应,绘制了散射截面为标度变量的图形。观... 采用来自坡密子圈方程的衍射标度效应,研究最新实验数据中的坡密子圈效应。用质量因子的方法分析最新的HERA实验数据,得到了饱和指数λ=0.208,该指数与理论预言相一致。为了直观的显示衍射标度效应,绘制了散射截面为标度变量的图形。观察图形可知无论是单举还是衍射的实验数据都几乎位于一条曲线上。结果证明了最新的HERA实验中存在坡密子圈效应。 展开更多
关键词 坡密子圈效应 胶子数涨落效应 色玻璃凝聚
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Probing valence quark width of the proton in deeply virtual Compton scattering at high energies
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作者 向文昌 曹德文 周代翠 《Chinese Physics C》 SCIE CAS CSCD 2024年第5期235-243,共9页
We use the refined hot spot model to study the valence quark shape of the proton with the deeply virtual Compton scattering at high energies in the color glass condensate framework.To investigate the individual valenc... We use the refined hot spot model to study the valence quark shape of the proton with the deeply virtual Compton scattering at high energies in the color glass condensate framework.To investigate the individual valence quark shape,a novel treatment of the valence quark width is employed.We calculate the cross-sections for coherent and incoherent deeply virtual Compton scattering using,for the first time,different widths(Bu and Bd)for the profile density distributions of the up and down quarks instead of using the same width as in the literature.We find that the cross-sections calculated with Bu≥Bd at each collision energy are consistent with each other,which is in agreement with theoretical expectations,whereas those computed with Bu<Bd show some discrepancies.This outcome implies that the up quark might emit more gluons than the down quark,leading to Bu≥Bd at high energy.The impact of energy on the outcome is estimated.Our results show that as the collision energy increases,the aforementioned discrepancies are not only significantly broadened,but also shift to a relatively smaller momentum transfer range at the future Electron-Ion Collider(EIC)and Large Hadron Electron Collider(LHeC)energies,which indicates that the EIC and LHeC can provide an unprecedented chance to access the shape of the valence quark of the proton. 展开更多
关键词 gluon saturation physics color glass condensate proton shape fluctuations
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ep散射中极小x区域的量子饱和现象 被引量:2
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作者 王宏民 许永晗 孙献静 《装甲兵工程学院学报》 2011年第6期93-95,共3页
利用建立在超杨-米尔斯理论基础上的胶子量子态饱和模型及Peterson璨夸克碎裂函数,在色玻璃凝聚理论框架下研究了ep(electron proton)深度非弹性散射中的D-介子产生。计算发现:在LHeC(Large Hadron-electronCollider)能量下,小Q2... 利用建立在超杨-米尔斯理论基础上的胶子量子态饱和模型及Peterson璨夸克碎裂函数,在色玻璃凝聚理论框架下研究了ep(electron proton)深度非弹性散射中的D-介子产生。计算发现:在LHeC(Large Hadron-electronCollider)能量下,小Q2区域会出现极小Bjorken-x区域的璨介子产生截面不依赖于x变化的现象。就LHeC能量下D-介子产生截面随横向动量变化的实验现象给出了理论预言,理论结果将被即将运行的LHeC实验检验。 展开更多
关键词 璨介子产生 深度非弹性散射 色玻璃凝聚
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高能质子-质子碰撞中的J/ψ和Υ产生 被引量:1
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作者 王宏民 孙献静 《装甲兵工程学院学报》 2017年第2期107-110,共4页
利用色玻璃凝聚理论(Color Glass Condensate,CGC),在假定入射核和靶核分别处于稀-密极限状态下分析了高能质子-质子碰撞中的璨(底)夸克对产生。在此基础上,利用由适用于较小x区域的KLR-Ad S/CFT(Kovchegov Lu Rezaeian Anti-de Sitter-... 利用色玻璃凝聚理论(Color Glass Condensate,CGC),在假定入射核和靶核分别处于稀-密极限状态下分析了高能质子-质子碰撞中的璨(底)夸克对产生。在此基础上,利用由适用于较小x区域的KLR-Ad S/CFT(Kovchegov Lu Rezaeian Anti-de Sitter-space/Conformal Field Theory)色偶极模型获得的偶极关联因子,根据色蒸发模型(Color Evaporation Model,CEM)研究了高能质子-质子碰撞中产生的J/ψ和Υ介子微分截面随快度和横向动量的变化规律。结果表明:理论值与欧洲大强子对撞机(Large Hadron Collider,LHC)实验结果基本一致,但在J/ψ产生截面的大横向动量区域还需要进一步的理论研究。 展开更多
关键词 色蒸发模型 偶极关联因子 色玻璃凝聚
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高能质子-质子碰撞中的熵密度 被引量:1
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作者 王宏民 《装甲兵工程学院学报》 2013年第5期99-102,共4页
考虑到质子内部分子横向空间分布,在色玻璃凝聚理论框架下分别利用KLN(Kharzeev Levin Nardi)模型和AdS/CFT(Anti-de Sitter space/Conformal Field Theory)模型,计算了欧洲大型强子对撞机当碰撞质心能量槡s=7 TeV时质子-质子碰撞中的... 考虑到质子内部分子横向空间分布,在色玻璃凝聚理论框架下分别利用KLN(Kharzeev Levin Nardi)模型和AdS/CFT(Anti-de Sitter space/Conformal Field Theory)模型,计算了欧洲大型强子对撞机当碰撞质心能量槡s=7 TeV时质子-质子碰撞中的熵密度。计算发现:AdS/CFT模型理论结果沿x和y方向变化趋势比KLN模型结果要缓慢得多,而且当碰撞参数较大时,等熵密度线椭圆效果较为明显。 展开更多
关键词 熵密度 色玻璃凝聚 厚度函数
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色玻璃凝聚近似下极端相对论重离子碰撞中的双轻子和光子产生(英文)
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作者 余功明 杨海涛 李云德 《原子核物理评论》 CAS CSCD 北大核心 2016年第1期25-29,共5页
在色玻璃凝聚胶子饱和框架下,研究了相对论重离子碰撞中的双轻子和光子产生。在胶子饱和区域,在微扰近似(kT-因子化近似)下低转移动量双轻子和光子的主要产生机制是胶子-胶子相互作用。在RHIC和LHC能量区域的相对论重离子碰撞中,饱和动... 在色玻璃凝聚胶子饱和框架下,研究了相对论重离子碰撞中的双轻子和光子产生。在胶子饱和区域,在微扰近似(kT-因子化近似)下低转移动量双轻子和光子的主要产生机制是胶子-胶子相互作用。在RHIC和LHC能量区域的相对论重离子碰撞中,饱和动量的值远远大于量子色动力学禁闭标度ΛQCD,这使得αs?1。此时,当转移动量小于饱和动量Qs时质子和原子核的胶子密度值就会很高,双轻子和光子的不变产生横截面会由于饱和效应而得到增强。数值结果给出在RHIC和LHC能量区域的pp,p A和AA碰撞中,来源于色玻璃凝聚的低转移动量双轻子和光子产生贡献是显著的。 展开更多
关键词 双轻子 光子 色玻璃凝聚 重离子碰撞
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Analytic expression for the proton structure function in deep inelastic scattering 被引量:1
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作者 向文昌 周代翠 +1 位作者 万仁卓 袁显宝 《Chinese Physics C》 SCIE CAS CSCD 2009年第2期98-102,共5页
The analytic expression of proton in deep inelastic scattering is studied by using the color glass condensate model and the dipole picture. We get a better description of the HERA DIS data than the GBW model which was... The analytic expression of proton in deep inelastic scattering is studied by using the color glass condensate model and the dipole picture. We get a better description of the HERA DIS data than the GBW model which was inspired by the Glauber model. We find that our model satisfies the unitarity limit and Froissart Bound which refers to an energy dependence of the total cross-section rising no more rapidly than ln^2 s. 展开更多
关键词 deep inelastic scattering color glass condensate proton structure function
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Hadron production with collinearly-improved unintegrated gluon distributions in high energy proton-proton collisions 被引量:1
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作者 Wenduo Zhao Wenchang Xiang +2 位作者 Mengliang Wang Yanbing Cai Daicui Zhou 《Chinese Physics C》 SCIE CAS CSCD 2022年第9期197-207,共11页
The collinearly-improved Balitsky-Kovchegov(ciBK)equation evolved unintegrated gluon distribution(UGD)is used for the first time to study hadron production in high energy proton-proton collisions in order to improve t... The collinearly-improved Balitsky-Kovchegov(ciBK)equation evolved unintegrated gluon distribution(UGD)is used for the first time to study hadron production in high energy proton-proton collisions in order to improve the predictive power of the Color Glass Condensate effective theory.We show that the ciBK equation evolved UGD provides a relatively better description of LHC data on the transverse momentum and integrated multiplicity distributions of charged hadron and neutral pion production for several collision energies compared with the running coupling Balitsky-Kovchegov(rcBK)equation evolved UGD.This is because the ciBK evolved UGD has a sharper transverse momentum distribution than the rcBK UGD.The impact of running coupling prescriptions on hadron production is studied,and it is found that the parent dipole and smallest dipole running coupling prescriptions provide similar depictions of the data.Moreover,the scale dependence of the fragmentation function is investigated by taking three typical values of scale.We find that the differences resulting from the scale dependence of the fragmentation function can be fully absorbed into the normalization factor,which lumps higher order corrections. 展开更多
关键词 color glass condensate small x physics gluon saturation
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高能质子-原子核碰撞中的J/ψ抑制现象
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作者 王宏民 王秀庭 孙献静 《装甲兵工程学院学报》 2019年第1期120-124,共5页
利用适用于较小x区域的KLR-AdS/CFT色偶极模型计算得到的偶极关联因子,在色玻璃凝聚(Color Glass Condensate,CGC)理论框架下研究了每核子对碰撞质心能量为5. 02、8. 16 Te V/c^2时质子-原子核碰撞中的J/ψ抑制现象。同时考虑原子核及... 利用适用于较小x区域的KLR-AdS/CFT色偶极模型计算得到的偶极关联因子,在色玻璃凝聚(Color Glass Condensate,CGC)理论框架下研究了每核子对碰撞质心能量为5. 02、8. 16 Te V/c^2时质子-原子核碰撞中的J/ψ抑制现象。同时考虑原子核及核子的内部结构,假定质子-原子核碰撞中胶子饱和标度与核子参与数成正比,建立了新的研究J/ψ抑制现象的核效应模型。通过与传统核效应模型的计算结果比较发现:新的核效应模型可以更好地解释ALICE和LHCb合作组最新实验现象,但未考虑碰撞截面次领头阶的影响。 展开更多
关键词 J/ψ抑制 Glauber-Gribov方法 色玻璃凝聚(cgc)
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Gluon saturation and pseudo-rapidity distributions of charged hadrons at RHIC energy regions
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作者 魏新兵 冯笙琴 《Chinese Physics C》 SCIE CAS CSCD 2012年第11期1069-1076,共8页
We modified the gluon saturation model by rescaling the momentum fraction according to satu- ration momentum and introduced Cooper-Frye hydrodynamic evolution to systematically study the pseudo- rapidity distributions... We modified the gluon saturation model by rescaling the momentum fraction according to satu- ration momentum and introduced Cooper-Frye hydrodynamic evolution to systematically study the pseudo- rapidity distributions of final charged hadrons at different energies and different centralities for Au-Au collisions in relativistic heavy-ion collisions at the BNL Relativistic Heavy Ion Collider (RHIC). The features of both gluon saturation and hydrodynamic evolution at different energies and different centralities for Au-Au collisions are investigated in this paper. 展开更多
关键词 color glass condensate gluon saturation hydrodynamic evolution
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Statistical physics in QCD evolution towards high energies
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作者 MUNIER Stphane 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS CSCD 2015年第8期1-32,共32页
The concepts and methods used for the study of disordered systems have proven useful in the analysis of the evolution equations of quantum chromodynamics in the high-energy regime: Indeed, parton branching in the semi... The concepts and methods used for the study of disordered systems have proven useful in the analysis of the evolution equations of quantum chromodynamics in the high-energy regime: Indeed, parton branching in the semi-classical approximation relevant at high energies and at a fixed impact parameter is a peculiar branching-diffusion process, and parton branching supplemented by saturation effects(such as gluon recombination) is a reaction-diffusion process. In this review article, we first introduce the basic concepts in the context of simple toy models, we study the properties of the latter, and show how the results obtained for the simple models may be taken over to quantum chromodynamics. 展开更多
关键词 quantum chromodynamics color dipole model color glass condensate stochastic fronts traveling waves REACTION-DIFFUSION
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