作者机构：
[Wang, Meng-Liang; Xiang, Wen-Chang; Cai, Yan-Bing] Guizhou Univ Finance & Econ, Guizhou Key Lab Phys & Related Areas, Guiyang 550025, Peoples R China.;[Xiang, Wen-Chang] Guizhou Univ Finance & Econ, Guizhou Key Lab Big Data Statist Anal, Guiyang 550025, Peoples R China.;[Xiang, Wen-Chang] Guizhou Univ, Dept Phys, Guiyang 550025, Peoples R China.;[Zhou, Dai-Cui] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Zhou, Dai-Cui] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Xiang, Wen-Chang] G;Guizhou Univ Finance & Econ, Guizhou Key Lab Phys & Related Areas, Guiyang 550025, Peoples R China.;Guizhou Univ Finance & Econ, Guizhou Key Lab Big Data Statist Anal, Guiyang 550025, Peoples R China.;Guizhou Univ, Dept Phys, Guiyang 550025, Peoples R China.
关键词：
gluon saturation;small-x physics;high energy heavy ion collisions
摘要：
<jats:title>Abstract</jats:title>
<jats:p>We analytically solve the Sudakov suppressed Balitsky-Kovchegov evolution equation with fixed and running coupling constants in the saturation region. The analytic solution of the <jats:italic>S</jats:italic>-matrix shows that the
<jats:inline-formula>
<jats:tex-math><?CDATA $\exp(-{\cal{O}}(\eta^2))$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_1_014103_M1.jpg" xlink:type="simple" />
</jats:inline-formula> rapidity dependence of the solution with the fixed coupling constant is replaced by the
<jats:inline-formula>
<jats:tex-math><?CDATA $\exp(-{\cal{O}}(\eta^{3/2}))$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_1_014103_M2.jpg" xlink:type="simple" />
</jats:inline-formula> dependence in the smallest dipole running coupling case, as opposed to obeying the law found in our previous publication, where all the solutions of the next-to-leading order evolution equations comply with
<jats:inline-formula>
<jats:tex-math><?CDATA $\exp(-{\cal{O}}(\eta))$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_45_1_014103_M3.jpg" xlink:type="simple" />
</jats:inline-formula> rapidity dependence once the QCD coupling is switched from the fixed coupling to the smallest dipole running coupling prescription. This finding indicates that the corrections of the sub-leading double logarithms in the Sudakov suppressed evolution equation are significant, which compensate for a part of the evolution decrease of the dipole amplitude introduced by the running coupling effect. To test the analytic findings, we calculate the numerical solutions of the Sudakov suppressed evolution equation, and the numerical results confirm the analytic outcomes. Moreover, we use the numerical solutions of the evolution equationto fit the HERA data. This demonstrates that the Sudakov suppressed evolution equation can achieve a good quality fit to the data.
</jats:p>
作者机构：
[Xiang, Wenchang; Wang, Mengliang; Cai, Yanbing] Guizhou Univ Finance & Econ, Guizhou Key Lab Phys & Related Areas, Guiyang 550025, Peoples R China.;[Xiang, Wenchang] Guizhou Univ, Dept Phys, Guiyang 550025, Peoples R China.;[Zhou, Daicui] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Zhou, Daicui] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Wang, Mengliang] G;Guizhou Univ Finance & Econ, Guizhou Key Lab Phys & Related Areas, Guiyang 550025, Peoples R China.
摘要：
We present results from analytic solutions to the running coupling, full next-to-leading order, and collinearly improved next-to-leading order Balitsky-Kovchegov equations in the saturation region with the smallest dipole size QCD running coupling prescription. The analytic results of the S matrix of the latter two equations show that the exp(−O(Y3/2)) rapidity dependence of the solutions is replaced by exp(−O(Y)) dependence once the running coupling prescription is switched from parent dipole to the smallest dipole prescription, which indicates that the S matrix has a strong dependence on the choice of running coupling prescription. We compute the numerical solutions of these Balitsky-Kovchegov equations with the smallest and parent dipole running coupling prescriptions; the numerical results confirm the analytic outcomes. The rare fluctuations of the S matrix on top of full next-to-leading order corrections are also studied under the smallest dipole running coupling prescription in the center of mass frame. It shows that the rare fluctuations are strongly suppressed and less important in the smallest dipole running coupling prescription case as compared to the parent dipole running coupling prescription case.
作者机构：
[Xiang, Wenchang; Wang, Mengliang; Cai, Yanbing] Guizhou Univ Finance & Econ, Guizhou Key Lab Phys & Related Areas, Guiyang 550025, Peoples R China.;[Xiang, Wenchang] Guizhou Univ, Dept Phys, Guiyang 550025, Peoples R China.;[Zhou, Daicui] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China.;[Zhou, Daicui] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Wang, Mengliang] G;Guizhou Univ Finance & Econ, Guizhou Key Lab Phys & Related Areas, Guiyang 550025, Peoples R China.
关键词：
color glass condensate;vector meson production;exclusive processes
摘要：
<jats:title>Abstract</jats:title>
<jats:p>The exclusive photoproduction of vector mesons (
<jats:inline-formula>
<jats:tex-math><?CDATA $J/\psi$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_7_074110_M1.jpg" xlink:type="simple" />
</jats:inline-formula> and
<jats:inline-formula>
<jats:tex-math><?CDATA $\phi$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_7_074110_M2.jpg" xlink:type="simple" />
</jats:inline-formula>) is investigated by considering the next-to-leading 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 the
<jats:inline-formula>
<jats:tex-math><?CDATA $\chi^2/d.o.f$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_7_074110_M3.jpg" xlink:type="simple" />
</jats:inline-formula> 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
<jats:inline-formula>
<jats:tex-math><?CDATA $J/\psi$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_7_074110_M4.jpg" xlink:type="simple" />
</jats:inline-formula> and
<jats:inline-formula>
<jats:tex-math><?CDATA $\phi$?></jats:tex-math>
<jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_44_7_074110_M5.jpg" xlink:type="simple" />
</jats:inline-formula> data in proton-proton collisions at 7 TeV and 13 TeV in LHCb experiments.
</jats:p>
作者机构：
[Zhou, Daicui; Zhang, Xiaoming; Kar, Somnath] Cent China Normal Univ, Key Lab Quark & Lepton Phys MoE, Wuhan 430079, Peoples R China.;[Zhou, Daicui; Zhang, Xiaoming; Kar, Somnath] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Kar, Somnath] Jadavpur Univ, Nucl & Particle Phys Res Ctr, Dept Phys, Kolkata 700032, India.;[Choudhury, Subikash] Fudan Univ, Key Lab Nucl Phys & Ion Beam Applicat MoE, Shanghai 200433, Peoples R China.;[Choudhury, Subikash] Fudan Univ, Inst Modern Phys, Shanghai 200433, Peoples R China.
通讯机构：
[Kar, Somnath] C;[Kar, Somnath] J;Cent China Normal Univ, Key Lab Quark & Lepton Phys MoE, Wuhan 430079, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;Jadavpur Univ, Nucl & Particle Phys Res Ctr, Dept Phys, Kolkata 700032, India.
摘要：
Purported signatures of collective dynamics in small systems like proton-proton ( pp) or proton-nucleus ( p−A) collisions still lack unambiguous understanding. Despite the qualitative and/or quantitative agreement of the data to hydrodynamic models, it has remained unclear whether the harmonic flows in small systems relate to the common physical picture of hydrodynamic collectivity driven by the initial geometry. In the present work, we aim to address this issue by invoking a novel concept of event shape engineering (ESE), which has been leveraged to get some control of the initial geometry in high-energy heavy-ion collisions. We utilize ESE by constructing a reference flow vector, q2 that allows to characterize an event based on its ellipticity. Applying this technique on a data set, simulated from a 3+1 dimensional viscous hydrodynamic model EPOS3, we study the event-shape dependent modifications to some of the bulk properties, such as inclusive transverse momentum ( pT) spectra and pT-differential v2 for p-Pb collisions at 5.02 TeV. Selecting events on the basis of different magnitudes of reference flow vector q2, we observe a hint of event-shape induced modifications of v2 as a function of pT, but the inclusive pT spectra of charged particles seem to be insensitive to this event-shape selection.
摘要：
We calculate the rare fluctuations of the S matrix for high-energy dipole-dipole scattering on top of the full next-to-leading-order corrections in the center of mass frame. The relevant result in the saturation regime shows that the exponential factor of the S matrix is 2 as large as the result which emerges when the rare fluctuation effects are taken into account. We find that the factor of 2 change of the exponential factor is induced by the gluon loop corrections which compensate for part of the rapidity decrease of the S matrix made by quark loops and lead to the rare fluctuations becoming important again. To ensure the relevant results of the S matrix are independent of the frame choice, the rare fluctuations of the S matrix are also derived in a general frame. It is found that all the results are consistent with each other in both frames.
作者机构：
[Cai, Shaohong; Xiang, Wenchang] Guizhou Univ Finance & Econ, Ctr Interdisciplinary Studies Phys & Related Area, Guizhou Univ, Dept Phys, Guiyang 550025, Peoples R China.;[Cai, Shaohong; Xiang, Wenchang] Guizhou Univ Finance & Econ, Ctr Interdisciplinary Studies Phys & Related Area, Guizhou Univ, Coll Big Data & Informat Engn, Guiyang 550025, Peoples R China.;[Zhou, Daicui; Xiang, Wenchang] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.;[Xiang, Wenchang] Guizhou Normal Univ, Dept Phys, Guiyang 550001, Peoples R China.
通讯机构：
[Xiang, Wenchang] G;[Xiang, Wenchang] C;Guizhou Univ Finance & Econ, Ctr Interdisciplinary Studies Phys & Related Area, Guizhou Univ, Dept Phys, Guiyang 550025, Peoples R China.;Guizhou Univ Finance & Econ, Ctr Interdisciplinary Studies Phys & Related Area, Guizhou Univ, Coll Big Data & Informat Engn, Guiyang 550025, Peoples R China.;Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
摘要：
We analytically solve the next-to-leading logarithmic Balitsky-Kovchegov equation approximated in the saturation regime, which includes corrections from quark and gluon loops, and large double transverse logarithms. The analytic result for the S-matrix in the saturation regime shows that the exp(−O(Y)) rapidity dependence of the running-coupling solution is replaced by exp(−O(Y3/2)) in the next-to-leading logarithmic solution. The collinearly improved Balitsky-Kovchegov equations are also analytically solved in the saturation regime. This shows that the double collinear logarithms do not contribute to the S-matrix, and the solution is the same as the one obtained from the leading-order Balitsky-Kovchegov equation. The numerical solutions to the leading-order and next-to-leading logarithmic Balitsky-Kovchegov equations are performed in order to test the analytic results derived in the saturation regime.
作者机构：
[Zeng, Ji; Xiang, Wen-Chang; Wu, Qing-Dong; Hu, Yuan-Yuan; Li, Quan-Bo] Guizhou Normal Univ, Coll Phys & Elect Sci, Guiyang 550001, Peoples R China.;[Zhou, Dai-Cui; Xiang, Wen-Chang] Huazhong Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China.
通讯机构：
[Xiang, Wen-Chang] G;Guizhou Normal Univ, Coll Phys & Elect Sci, Guiyang 550001, Peoples R China.
关键词：
深度非弹性散射;几何尺度;重夸克;尺度分析;数据包;结构函数;数据融合;全局分析
摘要：
An analytic massive total cross section of photon-proton scattering is derived, which has geometric scaling. A geometric scaling is used to perform a global analysis of the deep inelastic scattering data on inclusive structure function F2 measured in lepton-hadron scattering experiments at small values of Bjorken x. It is shown that the descriptions of the inclusive structure function F2 and longitudinal structure function FL are improved with the massive analytic structure function, which may imply the gluon saturation effect dominating the parton evolution process at HERA. The inclusion of the heavy quarks prevent the divergence of the lepton-hadron cross section, which plays a significant role in the description of the photoproduction region.
摘要：
<正>在国家自然科学基金委员会、科学部、教育部、中国高科技中心（CCAST）、国家外专局、华中师范大学和中国原子能科学研究院的资助下,由华中师范大学主办、中国原子能科学研究院协办的"2013年度LHC/ALICE物理国际学术会议（Combined ALICE Week and ALICE Physics Week 2013）",于2013年10月1018日在华中师范大学召开。华中师范大学的周代翠教授担任组织委员会主席,中国原子能科学研究院的李笑梅研究员担任组织委员会副主席。
