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Simultaneous Determination of fragmentation functions and Test on Momentum Sum Rule

Physical Review Letters 2024年第26期132卷 261903-261903页

作者： Jun Gao ChongYang Liu XiaoMin Shen Hongxi Xing Yuxiang Zhao INPAC Shanghai Key Laboratory for Particle Physics and Cosmology and School of Physics and Astronomy Key Laboratory for Particle Astrophysics and Cosmology (MOE) Shanghai 200240 China Notkestr. 85 22607 Hamburg Germany Key Laboratory of Atomic and Subatomic Structure and Quantum Control (MOE) Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Institute of Quantum Matter Guangdong-Hong Kong Joint Laboratory of Quantum Matter Guangdong Provincial Key Laboratory of Nuclear Science Southern Nuclear Science Computing Center Southern Center for Nuclear-Science Theory (SCNT) Beijing 100049 China Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics

We perform a simultaneous global analysis of hadron fragmentation functions (FFs) to various charged hadrons (π±, K±, and p/p¯) at next-to-leading order in QCD. The world data include results from electron-positron single-inclusive annihilation, semi-inclusive deep inelastic scattering, as well as proton-proton collisions including jet fragmentation measurements for the first time, which lead to strong constraints on the gluon fragmentations. By carefully selecting hadron kinematics to ensure the validity of QCD factorization and the convergence of perturbative calculations, we achieve a satisfying best fit with χ2/d.o.f.=0.90. The total momentum of u, d quarks and gluon carried by light charged hadrons have been determined precisely, urging precision determinations of FFs to neutral hadrons for a test of fundamental sum rules in QCD fragmentation.

关键词： fragmentation functions fragmentation into hadrons Perturbative QCD Quantum chromodynamics

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Number Density Interpretation of Dihadron fragmentation functions

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Physical Review Letters 2024年第1期132卷 011902-011902页

作者： D. Pitonyak C. Cocuzza A. Metz A. Prokudin N. Sato Department of Physics Lebanon Valley College Annville Pennsylvania 17003 USA Department of Physics SERC Temple University Philadelphia Pennsylvania 19122 USA Division of Science Penn State University Berks Reading Pennsylvania 19610 USA Jefferson Lab Newport News Virginia 23606 USA

We present a new quantum field-theoretic definition of fully unintegrated dihadron fragmentation functions (DiFFs) as well as a generalized version for n-hadron fragmentation functions. We demonstrate that this definition allows certain sum rules to be satisfied, making it consistent with a number density interpretation. Moreover, we show how our corresponding so-called extended DiFFs that enter existing phenomenological studies are number densities and also derive their evolution equations. Within this new framework, DiFFs extracted from experimental measurements will have a clear physical meaning.

关键词： fragmentation functions Quantum chromodynamics

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Information entropy and fragmentation functions

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NUCLEAR PHYSICS A 2023年 1036卷

作者： Benito-Calvino, Guillermo Garcia-Olivares, Javier Llanes-Estrada, Felipe J. Univ Complutense Madrid Fac Ciencias Fis Dept Fis Teor Plaza Ciencias 1 Madrid 28040 Spain Univ Complutense Madrid Fac Ciencias Fis IPARCOS Plaza Ciencias 1 Madrid 28040 Spain

Several groups have recently investigated the flow of information in high-energy collisions, from the entanglement entropy of the proton yielding classical Shannon entropy of its parton distribution functions (pdfs), through jet splitting generating entropy, to the entropy distribution in hadron *** in the literature is a discussion of the information entropy of fragmentation functions (FFs) in the instances where they can be considered as probability distributions, and we here provide it. We find that this entropy is a single, convenient number to characterize future progress in the extraction of fragmentation *** also deploy the related Kullback-Leibler divergence between two distributions to assess existing relations among FFs and parton distribution functions (pdfs) such as that of Barone, Drago and Ma. From a couple of current parametrizations of FFs, we do not find supporting empirical evidence for the relation, although it is possible that FFs and pdfs have similar power-laws near the x = 1 endpoint.(c) 2023 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons .org /licenses /by -nc -nd /4 .0/).

关键词： fragmentation functions Parton distribution functions Shannon entropy Classical information entropy Kullback-Leibler divergence Barone-Drago-Ma relation

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Tests of the parametrizations of fragmentation functions using data on inclusive pion and kaon production in unpolarized pp collisions from the STAR collaboration and at the NICA project

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INTERNATIONAL JOURNAL OF MODERN PHYSICS A 2023年第21期38卷

作者： Kotlorz, D. Christova, E. Leader, E. Bogoliubov Lab Theoret Phys Joint Inst Nucl Res Dubna 141980 Russia Bulgarian Acad Sci Inst Nucl Res & Nucl Energy Tzarigradsko chaussee 72 Sofia 1784 Bulgaria Imperial Coll London London SW7 2AZ England

The goal of this study is to check which, if any, of the published versions of the pion and kaon fragmentation functions (FFs) is compatible with the STAR data on semi-inclusive pion and kaon production in proton-proton collisions, and on the basis of this analysis to make reliable predictions for the p(T) spectra of the pions and kaons in inclusive pion and kaon production at the future NICA proton-proton collider. The calculations are carried out in next-to-leading order (NLO) of perturbative quantum chromodynamics (pQCD), using the well-tested CTEQ6 parton distributions. We consider the following pion and kaon FFs - DSEHS-14 [D. de Florian, R. Sassot, M. Epele, R. J. Hernandez-Pinto and M. Stratmann, Phys. Rev. D 91, 014035 (2015), 1410.6027], DSEHS-17 [D. de Florian, M. Epele, R. J. Hernandez-Pinto, R. Sassot and M. Stratmann, Phys. Rev. D 95, 094019 (2017), 1702.06353], LSS-15 [E. Leader, A. V. Sidorov and D. B. Stamenov, Phys. Rev. D 93, 074026 (2016), 1506.06381], HKNS-07 [M. Hirai, S. Kumano, T. H. Nagai and K. Sudoh, Phys. Rev. D 75, 094009 (2007), hep-ph/0702250] and AKK-08 [S. Albino, B. A. Kniehl and G. Kramer, Nucl. Phys. B 803, 42 (2008), 0803.2768]. Our analysis shows that within the experimental errors all tested sets of FFs provide a good fit to STAR data at the c.m. energy root S=200GeV, and the best ones are both LSS-15 and DSEHS-14 for pions and DSEHS-17 for kaons. From comparison of the LO and NLO results it is clear that the latter fit data much better, specially in the region of small p(T). The NLO cross-sections are also less scale-Q2 dependent, where pT/2 <= Q <= 2p(T), than the LO ones. In order to make predictions for NICA energies, we compare the NLO pQCD results with the existing experimental BES STAR data on semi-inclusive hadron production in the most peripheral Au+Au collisions where the nuclear effects can be neglected. The comparison for lower energy scales, like at NICA, shows that a purely pQCD approach is inadequate and suggests

关键词： High energy physics phenomenological aspects of field theory particle interactions quark model perturbative quantum chromodynamics strong interaction fragmentation functions semi-inclusive hadron production pp collisions

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Dihadron fragmentation functions from the NJL-jet model and their QCD evolution

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Physical Review D 2012年第11期86卷 114018-114018页

作者： Andrew Casey Ian C. Cloët Hrayr H. Matevosyan Anthony W. Thomas []CSSM and ARC Centre of Excellence for Particle Physics at the Terascale School of Chemistry and Physics University of Adelaide Adelaide South Australia 5005 Australia

We present results for dihadron fragmentation functions from the Nambu–Jona-Lasinio-jet model evolved from the model scale to a typical experimental scale of 4 GeV2. The numerical method used in this evolution is discussed in detail. The effect of evolution on the shapes of the dihadron fragmentation functions is discussed for a doubly favored process (u→π+π−), as well as a singly favored (u→π+K−) process involving light quarks. Finally, we explore the production of K+K− pairs from an initial u, d or s quark.

关键词： dihadron fragmentation fragmentation functions NJL-jet model dihadron evolution

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Determination of KS0 fragmentation functions including BESIII measurements and using neural networks

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Physical Review D 2024年第1期110卷 014019-014019页

作者： Maryam Soleymaninia Hadi Hashamipour Maral Salajegheh Hamzeh Khanpour Hubert Spiesberger Ulf-G. Meißner School of Particles and Accelerators I-87036 Arcavacata di Rende Cosenza Italy Helmholtz-Institut für Strahlen-und Kernphysik and Bethe Center for Theoretical Physics Faculty of Physics and Applied Computer Science Al. Mickiewicza 30 30-055 Kraków Poland Department of Physics PRISMA Institute for Advanced Simulation (IAS-4) 0186 Tbilisi Georgia

In this study, we revisit the extraction of parton-to-KS0 hadron fragmentation functions, named FF24-KS0, focusing on both next-to-leading-order and next-to-next-to-leading-order accuracy in perturbative QCD. Our approach involves the analysis of single inclusive electron-positron annihilation (SIA) data. The two key improvements are, on the one hand, the incorporation of the latest experimental data from the BESIII experiment and, on the other hand, the adoption of neural networks in the fitting procedure. To address experimental uncertainties, the Monte Carlo method is employed. Our investigation also explores the impact of hadron mass corrections on the description of SIA data, spanning a broad kinematic regime with a particular emphasis on the range of small z values. The theory prediction for KS0 production at both NLO and NNLO accuracy exhibits good agreement with experimental data within their respective uncertainties.

关键词： fragmentation functions Perturbative QCD QCD phenomenology

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

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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

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Jet fragmentation functions for Z-tagged jets

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PHYSICS LETTERS B 2019年 798卷 134978-000页

作者： Kang, Zhong-Bo Lee, Kyle Terry, John Xing, Hongxi Univ Calif Los Angeles Dept Phys & Astron Los Angeles CA 90095 USA Univ Calif Los Angeles Mani Bhaum Inst Theoret Phys Los Angeles CA 90095 USA SUNY Stony Brook CN Yang Inst Theoret Phys Stony Brook NY 11794 USA SUNY Stony Brook Dept Phys & Astron Stony Brook NY 11794 USA South China Normal Univ Inst Quantum Matter Guangzhou 510006 Guangdong Peoples R China South China Normal Univ Sch Phys & Telecommun Engn Guangzhou 510006 Guangdong Peoples R China

Recently the LHCb collaboration has measured both longitudinal and transverse momentum distribution of hadrons produced inside Z-tagged jets in proton-proton collisions at the Large Hadron Collider. These distributions are commonly referred to as jet fragmentation functions and are characterized by the longitudinal momentum fraction z(h) of the jet carried by the hadron and the transverse momentum j(perpendicular to) with respect to the jet direction. We derive a QCD formalism within Soft-Collinear Effective Theory to describe these distributions and find that the z(h)-dependence provides information on standard collinear fragmentation functions, while j(perpendicular to)-dependence probes transverse momentum dependent (TMD) fragmentation functions. We perform theoretical calculations and compare our results with the LHCb data. We find good agreement for the intermediate z(h) region. For j(perpendicular to)-dependence, we suggest binning in both z(h) and j(perpendicular to), which would lead to a more direct probing of TMD fragmentation functions. (C) 2019 The Author(s). Published by Elsevier B.V.

关键词： Jets fragmentation functions Perturbative QCD Soft Collinear Effective Theory

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fragmentation functions AT BABAR

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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

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Evolution of Shower Parton Distributions in a Jet from Quark Recombination Model

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Chinese Physics Letters 2006年第2期23卷 332-335页

作者：谭志光杨纯斌 Institute of Particle Physics Huazhong Normal University Wuhan 430079

The evolution of shower parton distributions in a jet is investigated in the framework of a quark recombination model. The distributions are parameterized and the Q^2 dependence of the parameters is given by polynomia... 详细信息

关键词： INELASTIC EP SCATTERING fragmentation functions PERTURBATION-THEORY

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