检索结果-内蒙古大学图书馆

fragmentation functions of neutral mesons π⁰ and κ⁰ with Laplace transform approach

INTERNATIONAL JOURNAL OF MODERN PHYSICS A 2016年第17期31卷

作者： Taghavi-Shahri, F. Tehrani, S. Atashbar Zarei, M. Ferdowsi Univ Mashhad Dept Phys POB 1436 Mashhad Iran POB 1149-8834413 Tehran Iran

With an analytical solutions of DGLAP evolution equations based on the Laplace transform method, we find the fragmentation functions (FFs) of neutral mesons, pi(0) and kappa(0) at NLO approximation. We also calculated the total fragmentation functions of these mesons and compared them with experimental data and those from global fits. The results show a good agreement between our solutions and other models and they are compatible with experimental data.

关键词： Laplace transform fragmentation functions natural meson

来源：评论

学校读者我要写书评

暂无评论

Measurement of jet fragmentation functions and of their moments in pp collisions at √s =2.76 TeV with ALICE at the LHC

Measurement of jet fragmentation functions and of their mome...

引用

作者： Mengliang WANG Central China Normal University

学位级别：博士

A cross-over between ordinary nuclear matter and a state of decon? ned quarks and gluons, the Quark Gluon Plasma (QGP), is predicted by lattice QCD calculations at low chemical potential and high temperature in the nuclear phase diagram. Ex- perimentally, ultra-relativistic heavy ion collisions are used to produce and study the hot and dense QGP medium. Produced in a hard scattering at the early stage of the collision a highly ener- getic parton is? rst expected to lose energy in the medium before fragmenting into a hadronic spray of particles called jet. A detailed study of the modi? cation of the jet structure and of its fragmentation pattern in vacuum and in medium should provide insights into the QGP properties. The jet fragmentation functions describe the momentum distribution of hadrons inside a reconstructed jet. In proton-proton (pp) collisions their measurement is important for understanding the mechanisms of parton fragmentation. Such measurements also provide a test of perturbative Quantum Chromo Dynamics (pQCD) as well as a baseline for similar measurements in p-A collisions (revealing potential cold nuclear matter e? ects) or in A-A colli- sions (shedding light on the energy loss mechanisms in presence of a hot and dense medium). However, in heavy-ion collisions the presence of a large underlying event and of its event-by-event? uctuations makes the measurement of jet fragmentation functions a challenging task. The use of the fragmentation function moments has been proposed in [1] as a way to overcome this di? culty. The ALICE detector at the Large Hadron Collider (LHC) has unique tracking capabilities enabling to measure charged particles down to transverse momenta as low as 150 ∼ MeV/c. This allows assessing possible modi? cations of the jet structure and helps constraining the jet fragmentation functions. The ALICE Electromagnetic Calorimeter (EMCal) can also be used to measure hard probes of the initial collision, including jets, high p T photons, n

关键词： pp collisions ultra-relativistic heavy-ion collisions QGP ALICE jets fragmentation functions fragmentation function moments electromagnetic calorimeters EMCal DCal

来源：评论

学校读者我要写书评

暂无评论

Explaining the fine hierarchy in pion and kaon suppression at LHC: importance of fragmentation functions

引用

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 2014年第5期41卷 055104-55103页

作者： Djordjevic, Magdalena Djordjevic, Marko Univ Belgrade Inst Phys Belgrade Belgrade Serbia Univ Belgrade Fac Biol Belgrade Serbia

We here concentrate on available pi(+/-) and K-+/- ALICE preliminary R-AA data in central 2.76 TeV Pb+Pb collisions at LHC. These data show an interesting fine resolution hierarchy, i.e. the measured K-+/- data have consistently somewhat lower suppression compared to pi(+/-) measurements. We here ask whether theoretical predictions based on energy loss in dynamical QCD medium can quantitatively and qualitatively explain such fine resolution. While our suppression calculations agree well with the data, we find that qualitatively explaining the fine hierarchy critically depends on the choice of fragmentation functions. While the most widely used fragmentation functions lead to the reversal of the observed hierarchy, a more recent version correctly reproduce the experimental data. We here point to the reasons behind such discrepancy in the predictions. Our results indicate that accuracy of the theoretical predictions reached a point where comparison with fine resolution data at LHC can generate useful understanding.

关键词： pion suppression jet energy loss jet suppression hierarchy fragmentation functions quark-gluon plasma

来源：评论

学校读者我要写书评

暂无评论

Open heavy flavour production in small systems with ALICE

引用

Nuclear and Particle Physics Proceedings 2023年 324-329卷 12-15页

作者： Costanza, Susanna Dipartimento di Fisica University of Pavia Via A. Bassi 6 Pavia Italy INFN Sezione di Pavia Via A. Bassi 6 Pavia Italy

Charm and beauty production measurements in proton–proton (pp) collisions are an important test of perturbative QCD calculations, based on the factorisation approach, which assumes universal fragmentation functions among different collision systems. Recent measurements of charm baryon production at midrapidity in small systems show a baryon-to-meson ratio significanlty higher than that in e⁺e⁻ and e⁻p collisions: this observation suggests that charm fragmentation is not universal across different collision systems. Therefore, measurements of charm baryon production are fundamental to characterise the charm quark hadronisation in pp and proton–lead (p–Pb) collisions at the LHC energies. In these proceedings, the latest measurements of D⁰, D⁺ and D_s⁺ mesons, the new measurements of Λ_c⁺, Ξ_c^0,+, Σ_c^0,++, the first measurement of Ω_c⁰ baryons and of the non-prompt Λ_c⁺, performed with the ALICE detector at midrapidity in pp collisions at s=5.02 and s=13TeV are presented. Furthermore, the recent Λ_c⁺/D⁰ yield ratio, measured down to p_T=0 in pp and p–Pb collisions will be discussed together with the measurements of the charm fragmentation fractions into hadrons in pp and p–Pb collisions at s_NN=5.02TeV. This rich set of experimental results challenges existing theoretical calculations. © 2023 Elsevier B.V.

关键词： Charm quark hadronisation fragmentation functions Heavy-flavour hadrons Heavy-flavour production

来源：评论

学校读者我要写书评

暂无评论

fragmentation functions AT BABAR

引用

International Journal of Modern Physics: Conference Series 2014年第25期ijmpcs卷

作者： on behalf of the BaBar Collaboration ISABELLA GARZIA INFN-Sezione di Ferrara and University of Ferrara Ferrara Italy

Inclusive hadron production cross section in e + e - annihilation shed light on fundamental questions of hadronization and fragmentation processes. We present measurements of inclusive spectra of charged pions, kaons, and protons (antiprotons) produced in e + e - collisions at the center-of-mass energy of 10.54 GeV, and tests of QCD predictions and hadronization models. We also report the results on the measurement of the azimuthal modulation induced by the Collins effect in inclusive production of charged pion pairs e + e - → ππX, where the two pions are produced in opposite hemispheres. These data allows the determination of the polarized Collins fragmentation functions.

关键词： fragmentation functions hadrons production

来源：评论

学校读者我要写书评

暂无评论

Next-to-Next-to-Leading Order QCD Corrections to Polarized Semi-Inclusive Deep-Inelastic Scattering

引用

Physical Review Letters 2024年第21期133卷 211905-211905页

作者： Saurav Goyal Roman N. Lee Sven-Olaf Moch Vaibhav Pathak Narayan Rana V. Ravindran The Institute of Mathematical Sciences Taramani 600113 Chennai India Homi Bhabha National Institute Training School Complex Anushakti Nagar Mumbai 400094 India Budker Institute of Nuclear Physics 630090 Novosibirsk Russia II. Institute for Theoretical Physics Hamburg University D-22761 Hamburg Germany School of Physical Sciences National Institute of Science Education and Research 752050 Jatni India

Polarized semi-inclusive deep-inelastic scattering (SIDIS) is a key process in the quest for a resolution of the proton spin puzzle. We present the complete results for the polarized SIDIS process at next-to-next-to-leading order (NNLO) in perturbative quantum chromodynamics. Our analytical results include all partonic channels for the scattering of polarized leptons off hadrons and a spin-averaged hadron identified in the final state. A numerical analysis of the NNLO corrections illustrates their significance and the reduced residual scale dependence in the kinematic range probed by the future electron-ion collider.

关键词： Deep inelastic scattering fragmentation functions Perturbative QCD Spin-dependent parton distribution functions Differential equations

来源：评论

学校读者我要写书评

暂无评论

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

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

Single spin asymmetry AULsin(2ϕh) in dihadron production in SIDIS

引用

Physical Review D 2024年第11期109卷 114038-114038页

作者： Ren Yang Yangyang Yu Qihang Zhou Gang Li Mao Song Xuan Luo School of Physics and Optoelectronics Engineering Anhui University Hefei 230601 China

The paper calculates the helicity-dependent dihadron fragmentation function by extending the dihadron spectator model and examine the single longitudinal spin asymmetry AULsin(2ϕh) from dihadron in semi-inclusive inelastic scattering. This function elucidates the relationship between the longitudinal polarization of the fragmented quark and the transverse momentum of the resulting hadron pairs. A study by the COMPASS collaboration detected a minimal signal in their experimental search for this azimuthal asymmetry in semi-inclusive inelastic scattering. Here, we use the spectator model to calculate the unknown T-odd dihadron fragmentation function H1⊥. Adopting collinear factorization to describe the data, avoiding the transverse momentum dependent factorization and the associated resummation effects, helping us understand the asymmetry and explaining why the signal is so weak. We involve the approach of transverse momentum dependence in the model calculations, in order to formulate the differential cross sections and the spin asymmetries in terms of the collinear parton distributions and the collinear dihadron fragmentation functions. A transverse momentum factor analysis method was used, in which the transverse momentum of the final hadron pairs was not integrated. The asymmetry of sin(2ϕh) in COMPASS kinematics was calculated and compared with experimental data. In addition, predictions for the same asymmetry are also presented for HERMES and the Electron Ion Collider.

关键词： Deep inelastic scattering Electron-ion collisions fragmentation functions Hadron production Nucleon spin structure Lepton-hadron colliders

来源：评论

学校读者我要写书评

暂无评论

Complete next-to-leading order calculation of single inclusive π0 production in forward proton-nucleus collisions

引用

Physical Review D 2024年第3期109卷 034018-034018页

作者： Heikki Mäntysaari Yossathorn Tawabutr Department of Physics University of Jyväskylä P.O. Box 35 40014 University of Jyväskylä Finland and Helsinki Institute of Physics P.O. Box 64 00014 University of Helsinki Finland

We present the first fully consistent calculation of inclusive π0 production at forward rapidities at next-to-leading order (NLO) accuracy in proton-lead collisions at s=8.16 TeV within the color glass condensate approach. The center-of-mass energy dependence is determined by the Balitsky-Kovchegov equation with the initial condition constrained at NLO accuracy by the proton structure function measurements. We find that the LHCb data further constrain this nonperturbative input, and that both the NLO corrections to the evolution equation and to the impact factor have significant effects on the nuclear modification factor RpPb. The complete NLO calculation is shown to be in qualitative agreement with the LHCb data, and the predictions are found to be sensitive to the details of the applied deep inelastic scattering (DIS) fit. These results demonstrate the need to perform global analyses of DIS and LHC data in order to probe gluon saturation phenomena at precision level at very small momentum fraction x.

关键词： fragmentation functions Particle interactions Particle production Parton distribution functions Perturbative QCD QCD phenomenology Quantum chromodynamics

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：