检索结果-内蒙古大学图书馆

Measurements of Normalized Differential Cross Sections of Inclusive η Production in e+e− Annihilation at Energy from 2.0000 to 3.6710 GeV

引用

Physical Review Letters 2024年第2期133卷 021901-021901页

作者： M. Ablikim M. N. Achasov P. Adlarson O. Afedulidis X. C. Ai R. Aliberti A. Amoroso Q. An D. Anderle Y. Bai O. Bakina I. Balossino Y. Ban H.-R. Bao V. Batozskaya K. Begzsuren N. Berger M. Berlowski M. Bertani D. Bettoni F. Bianchi E. Bianco A. Bortone I. Boyko R. A. Briere A. Brueggemann H. Cai X. Cai A. Calcaterra G. F. Cao N. Cao S. A. Cetin J. F. Chang G. R. Che G. Chelkov C. Chen C. H. Chen Chao Chen G. Chen H. S. Chen H. Y. Chen M. L. Chen S. J. Chen S. L. Chen S. M. Chen T. Chen X. R. Chen X. T. Chen Y. B. Chen Y. Q. Chen Z. J. Chen Z. Y. Chen S. K. Choi G. Cibinetto F. Cossio J. J. Cui H. L. Dai J. P. Dai A. Dbeyssi R. E. de Boer D. Dedovich C. Q. Deng Z. Y. Deng A. Denig I. Denysenko M. Destefanis F. De Mori B. Ding X. X. Ding Y. Ding J. Dong L. Y. Dong M. Y. Dong X. Dong M. C. Du S. X. Du Y. Y. Duan Z. H. Duan P. Egorov Y. H. Fan J. Fang S. S. Fang W. X. Fang Y. Fang Y. Q. Fang R. Farinelli L. Fava F. Feldbauer G. Felici C. Q. Feng J. H. Feng Y. T. Feng M. Fritsch C. D. Fu J. L. Fu Y. W. Fu H. Gao X. B. Gao Y. N. Gao Yang Gao S. Garbolino I. Garzia L. Ge P. T. Ge Z. W. Ge C. Geng E. M. Gersabeck A. Gilman K. Goetzen L. Gong W. X. Gong W. Gradl S. Gramigna M. Greco M. H. Gu Y. T. Gu C. Y. Guan Z. L. Guan A. Q. Guo L. B. Guo M. J. Guo R. P. Guo Y. P. Guo A. Guskov J. Gutierrez K. L. Han T. T. Han F. Hanisch X. Q. Hao F. A. Harris K. K. He K. L. He F. H. Heinsius C. H. Heinz Y. K. Heng C. Herold T. Holtmann P. C. Hong G. Y. Hou X. T. Hou Y. R. Hou Z. L. Hou B. Y. Hu H. M. Hu J. F. Hu S. L. Hu T. Hu Y. Hu G. S. Huang K. X. Huang L. Q. Huang X. T. Huang Y. P. Huang T. Hussain F. Hölzken N. Hüsken N. in der Wiesche J. Jackson S. Janchiv J. H. Jeong Q. Ji Q. P. Ji W. Ji X. B. Ji X. L. Ji Y. Y. Ji X. Q. Jia Z. K. Jia D. Jiang H. B. Jiang P. C. Jiang S. S. Jiang T. J. Jiang X. S. Jiang Y. Jiang J. B. Jiao J. K. Jiao Z. Jiao S. Jin Y. Jin M. Q. Jing X. M. Jing T. Johansson S. Kabana N. Kalantar-Nayestanaki X. L. Kang X. S. Kang M. Kavatsyuk B. C. Ke V. Khachatryan A. Khoukaz R. Kiuchi O. B. Kolcu B. Kopf M. Kuessne Institute of High Energy Physics Beijing 100049 People’s Republic of China Budker Institute of Nuclear Physics SB RAS (BINP) Novosibirsk 630090 Russia Uppsala University Box 516 SE-75120 Uppsala Sweden Bochum Ruhr-University D-44780 Bochum Germany Zhengzhou University Zhengzhou 450001 People’s Republic of China Johannes Gutenberg University of Mainz Johann-Joachim-Becher-Weg 45 D-55099 Mainz Germany University of Turin and INFN I-10125 Turin Italy INFN I-10125 Turin Italy Hefei 230026 People’s Republic of China State Key Laboratory of Particle Detection and Electronics Beijing 100049 Hefei 230026 People’s Republic of China South China Normal University Guangzhou 510006 People’s Republic of China Southeast University Nanjing 211100 People’s Republic of China Joint Institute for Nuclear Research 141980 Dubna Moscow region Russia INFN Sezione di Ferrara I-44122 Ferrara Italy Peking University Beijing 100871 People’s Republic of China Beijing 100049 People’s Republic of China National Centre for Nuclear Research Warsaw 02-093 Poland Institute of Physics and Technology Peace Avenue 54B Ulaanbaatar 13330 Mongolia INFN Laboratori Nazionali di Frascati I-00044 Frascati Italy Carnegie Mellon University Pittsburgh Pennsylvania 15213 USA University of Muenster Wilhelm-Klemm-Strasse 9 48149 Muenster Germany Wuhan University Wuhan 430072 People’s Republic of China Turkish Accelerator Center Particle Factory Group Istinye University 34010 Istanbul Turkey Nankai University Tianjin 300071 People’s Republic of China China University of Geosciences Wuhan 430074 People’s Republic of China Soochow University Suzhou 215006 People’s Republic of China Henan University Kaifeng 475004 People’s Republic of China Nanjing University Nanjing 210093 People’s Republic of China North China Electric Power University Beijing 102206 People’s Republic of China Tsinghua University Beijing 100084 People’s Republic of China Institute of Modern Physics Lanzhou 730000 People’s Repub

Using data samples collected with the BESIII detector operating at the BEPCII storage ring, the cross section of the inclusive process e+e−→η+X, normalized by the total cross section of e+e−→hadrons, is measured at eight center-of-mass energy points from 2.0000 to 3.6710 GeV. These are the first measurements with momentum dependence in this energy region. Our measurement shows a significant discrepancy compared to the existing fragmentation functions. To address this discrepancy, a new QCD analysis is performed at the next-to-next-to-leading order with hadron mass corrections and higher twist effects, which can explain both the established high-energy data and our measurements reasonably well.

关键词： Color confinement fragmentation functions fragmentation into hadrons Quantum chromodynamics

来源：评论

学校读者我要写书评

暂无评论

RECENT RESULTS FROM RHIC SPIN AND BELLE fragmentation FUNCTION MEASUREMENTS

引用

International Journal of Modern Physics: Conference Series 2012年第20期ijmpcs卷 37-44页

作者： ANSELM VOSSEN Center for Exploration of Energy and Matter Indiana University 2401 N. Milo B Sampson Lane Bloomington IN 47408 USA

This contribution summarizes recent results from the RHIC spin program and the measurement of light quark fragmentation functions at Belle.

关键词： RHIC PHENIX STAR spin Belle Collins Effect interference fragmentation fragmentation functions transverse single spin asymmetries gluon polarization

来源：评论

学校读者我要写书评

暂无评论

Semi-Inclusive Deep-Inelastic Scattering at Next-to-Next-to-Leading Order in QCD

引用

Physical Review Letters 2024年第25期132卷 251901-251901页

作者： Leonardo Bonino Thomas Gehrmann Giovanni Stagnitto & INFN Piazza della Scienza 3 20216 Milano Italy

Semi-inclusive hadron production processes in deep-inelastic lepton-nucleon scattering are important probes of the quark flavor structure of the nucleon and of the fragmentation dynamics of quarks into hadrons. We compute the full next-to-next-to-leading order QCD corrections to the coefficient functions for semi-inclusive deep-inelastic scattering in analytical form. The numerical impact of these corrections for precision physics is illustrated by a detailed comparison with data on single inclusive hadron spectra from the CERN COMPASS experiment.

关键词： fragmentation functions Perturbative QCD QCD phenomenology

来源：评论

学校读者我要写书评

暂无评论

Jet modification in three dimensional fluid dynamics at next-to-leading twist

引用

Physical Review C 2007年第4期76卷 041902(R)-041902(R)页

作者： A. Majumder C. Nonaka S. A. Bass Department of Physics Duke University Durham North Carolina 27708 USA Department of Physics Nagoya University Nagoya 464-8602 Japan

The modification of the single inclusive spectrum of high transverse momentum (pT) pions emanating from an ultrarelativistic heavy-ion collision is investigated. The deconfined sector is modeled using a full three-dimensional (3-D) ideal fluid dynamics simulation. Energy loss of high pT partons and the ensuing modification of their fragmentation is calculated within perturbative QCD at next-to-leading twist, where the magnitude of the higher twist contribution is modulated by the entropy density extracted from the 3-D fluid dynamics simulation. The nuclear modification factor (RAA) for pions with a pT⩾8 GeV as a function of centrality as well as with respect to the reaction plane is calculated. The magnitude of contributions to the differential RAA within small angular ranges, from various depths in the dense matter, is extracted from the calculation and demonstrates the correlation of the length integrated density and the RAA from a given depth. The significance of the mixed and hadronic phase to the overall magnitude of energy loss is explored.

关键词： NUCLEUS-NUCLEUS COLLISIONS HEAVY-ION COLLISIONS QUARK-GLUON PLASMA PARTON ENERGY-LOSS fragmentation functions HADRON SPECTRA COLLABORATION FLUCTUATIONS PERSPECTIVE TOMOGRAPHY

来源：评论

学校读者我要写书评

暂无评论

Parton shower evolution in a 3D hydrodynamical medium

引用

Physical Review C 2008年第3期78卷 034908-034908页

作者： Thorsten Renk []Department of Physics University of Jyv?skyl? P. O. Box 35 FI-40014 Finland and Helsinki Institute of Physics University of Helsinki P. O. Box 64 FI-00014 Finland

We present a Monte Carlo simulation of the perturbative quantum chromodynamics shower developing after a hard process embedded in a heavy-ion collision. The main assumption is that the cascade of branching partons traverses a medium that (consistent with standard radiative energy loss pictures) is characterized by a local transport coefficient q^ that measures the virtuality per unit length transferred to a parton that propagates in this medium. This increase in parton virtuality alters the development of the shower and in essence leads to extra induced radiation and hence a softening of the momentum distribution in the shower. After hadronization, this leads to the concept of a medium-modified fragmentation function. On the level of observables, this is manifest as the suppression of high-transverse-momentum (PT) hadron spectra. We simulate the soft medium created in heavy-ion collisions by a 3D hydrodynamical evolution and average the medium-modified fragmentation function over this evolution to compare with data on single inclusive hadron suppression and extract the q^ that characterizes the medium. Finally, we discuss possible uncertainties of the model formulation and argue that the data in a soft momentum show evidence of qualitatively different physics that presumably cannot be described by a medium-modified parton shower.

关键词： INELASTIC EP 03SCATTERING RADIATIVE ENERGY-LOSS HEAVY-ION COLLISIONS PLUS AU COLLISIONS fragmentation functions PERTURBATION-THEORY MACH CONES QCD DISTRIBUTIONS STAR quantum chromodynamics ION COLLISIONS Three Dimensions energy losses perturbation theory Momentum distribution HADRONS PARTONS Monte Carlo technique

来源：评论

学校读者我要写书评

暂无评论

Densities, parton distributions, and measuring the nonspherical shape of the nucleon

引用

Physical Review C 2007年第6期76卷 065209-065209页

作者： Gerald A. Miller University of Washington Seattle Washington 98195-1560 USA

Spin-dependent quark densities, matrix elements of specific density operators in proton states of definite spin-polarization, indicate that the nucleon may harbor an infinite variety of nonspherical shapes. We show that these matrix elements are closely related to specific transverse-momentum-dependent (TMD) parton distributions accessible in the angular dependence of the semi-inclusive processes ep→eπX and the Drell-Yan reaction pp→ll¯X. New measurements or analyses would allow the direct exhibition of the nonspherical nature of the proton.

关键词： fragmentation functions LEPTOPRODUCTION POLARIZATION

来源：评论

学校读者我要写书评

暂无评论

Dihadron correlation in jets produced in heavy-ion collisions

引用

Physical Review C 2004年第5期70卷 054902-054902页

作者： Rudolph C. Hwa C. B. Yang Institute of Theoretical Science and Department of Physics University of Oregon Eugene Oregon 97403-5203 USA Institute of Particle Physics Hua-Zhong Normal University Wuhan 430079 China

The difference between the structures of jets produced in heavy-ion and hadronic collisions can best be exhibited in the correlations between particles within those jets. We study the dihadron correlations in jets in the framework of parton recombination. Two types of triggers, π+ and proton, are considered. It is shown that the recombination of thermal and shower partons makes the most important contribution to the spectra of the associated particles at intermediate pT. In pp collisions the only significant contribution arises from shower-shower recombination, which is negligible in heavy-ion collisions. Moments of the associated-particle distributions are calculated to provide a simple summary of the jet structures for easy comparison with experiments.

关键词： fragmentation functions PHENIX

来源：评论

学校读者我要写书评

暂无评论

Jet conversions in a quark-gluon plasma

引用

Physical Review C 2007年第5期75卷 051901(R)-051901(R)页

作者： W. Liu C. M. Ko B. W. Zhang Texas A&amp M Univ Inst Cyclotron College Stn TX 77843 USA Texas A&amp M Univ Dept Phys College Stn TX 77843 USA

Quark and gluon jets traversing through a quark-gluon plasma not only lose their energies but also can undergo flavor conversions. The conversion rates via the elastic q(q¯)g→gq(q¯) and the inelastic qq¯↔gg scatterings are evaluated in the lowest order in QCD. Including both jet energy loss and conversions in the expanding quark-gluon plasma produced in relativistic heavy ion collisions, we have found a net of quark jets to gluon jets. This reduces the difference between the nuclear modification factors for quark and gluon jets in central heavy ion collisions and thus enhances the p/π+ and p¯/π− ratios at high transverse momentum. However, a much larger net quark-to-gluon jet conversion rate than the one given by the lowest order QCD is needed to account for the observed similar ratios in central Au+Au and p+p collisions at the same energy. Implications of our results are discussed.

关键词： HEAVY-ION COLLISIONS ABELIAN ENERGY-LOSS fragmentation functions HADRON SPECTRA COLLABORATION SCATTERING OPACITY NUCLEI

来源：评论

学校读者我要写书评

暂无评论

Twist-4 contributions to e⁺e- → ΩX process

引用

NUCLEAR PHYSICS A 2020年 997卷 121729-121729页

作者： Yang, Weihua Yan Tai Univ Coll Nucl Equipment & Nucl Engn Yantai 264005 Peoples R China

The description of particles with spin in high energy reaction can be attained by using a spin density matrix. In this paper we introduce the spin density matrix for spin-3/2 particles. With this matrix, we present the complete twist-4 results for the e(+)e- -> Omega X at the tree level of perturbative quantum chromodynamics. The calculations are carried out by applying the collinear expansion. In the collinear expansion formalism the multiple gluon scattering is taken into account and gauge links are obtained systematically and automatically. We present the complete results for structure functions and the polarizations of the produced hadron in terms of gauge invariant fragmentation functions up to twist-4. We obtain 28 structure functions, among them 8 are leading twist, 12 are twist-3, 4 are twist-4 and the others do not correspond to fragmentation functions. We also obtain 3 longitudinal and 6 transverse polarizations. For the complete twist-4 calculation, the four-quark correlator contributions are also considered in this paper. (C) 2020 Elsevier B.V. All rights reserved.

关键词： Twist-4 Annihilation process fragmentation functions

来源：评论

学校读者我要写书评

暂无评论

Final state interactions and hadron quenching in cold nuclear matter

引用

Physical Review C 2007年第3期76卷 034902-034902页

作者： A. Accardi Department of Physics and Astronomy Iowa State University Ames Iowa 50011 USA

I examine the role of final state interactions in cold nuclear matter in modifying hadron production on nuclear targets with leptonic or hadronic beams. I demonstrate the extent to which available experimental data in electron-nucleus collisions can give direct information on final state effects in hadron-nucleus and nucleus-nucleus collisions. For hadron-nucleus collisions, a theoretical estimate based on a parton energy loss model tested in lepton-nucleus collisions shows a large effect on midrapidity hadrons at fixed target experiments. At energies currently available at the BNL Relativistic Heavy Ion Collider, the effect is large for negative rapidity hadrons but mild at midrapidity. This final state cold hadron quenching needs to be taken into account in jet tomographic analysis of the medium created in nucleus-nucleus collisions.

关键词： DEEP-INELASTIC SCATTERING PARTON ENERGY-LOSS LARGE TRANSVERSE-MOMENTUM QUARK-GLUON PLASMA DIMUON PRODUCTION fragmentation functions GLASS CONDENSATE D+AU COLLISIONS HADRONIZATION QCD

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：