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Dihadron helicity correlation in photon-nucleus collisions

Physical Review D 2024年第5期110卷 056040页

作者： Zhao-Xuan Chen Hui Dong Shu-Yi Wei Institute of Frontier and Interdisciplinary Science Key Laboratory of Particle Physics and Particle Irradiation (MOE) Shandong University Shandong Qingdao 266237 China

The helicity correlation of two back-to-back hadrons is a powerful tool that makes it possible to probe the longitudinal spin transfer G1L in unpolarized hadronic collisions. In this work, we investigate the helicity correlation of back-to-back dihadrons produced in photon-nucleus collisions with both spacelike and quasireal photons and explore its potential in understanding the flavor dependence of spin-dependent fragmentation functions. We present helicity amplitudes of partonic scatterings with both virtual and real photons and make numerical predictions for the dihadron helicity correlations at the future Electron Ion Collider experiment and the current Relativistic Heavy Ion Collider/LHC ultraperipheral collision experiment. Future experimental measurements can also illuminate the fragmentation function of circularly polarized gluons.

关键词： fragmentation functions

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Semi-inclusive production of spin-3/2 hadrons in deep inelastic scattering

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Physical Review D 2024年第7期109卷 074017-074017页

作者： Jing Zhao Zhe Zhang Zuo-tang Liang Tianbo Liu Ya-jin Zhou Key Laboratory of Particle Physics and Particle Irradiation (MOE) Institute of Frontier and Interdisciplinary Science Shandong University Qingdao Shandong 266237 China Southern Center for Nuclear-Science Theory (SCNT) Institute of Modern Physics Chinese Academy of Sciences Huizhou 516000 China

We investigate the production of spin-3/2 hadrons in semi-inclusive deep inelastic lepton-nucleon scatterings. The complete differential cross section is derived through the kinematic analysis and expressed in terms of 288 structure functions, corresponding to all polarization configurations and azimuthal modulations. For an unpolarized lepton beam, half of the 192 structure functions have nonzero leading order contributions in the parton model, among which 42 are from rank-3 tensor polarized fragmentation functions of the hadron. For a polarized lepton beam, one third of the 96 structure functions contribute at the leading order and 14 of them are from rank-3 tensor polarized fragmentation functions. In addition to the formalism, we perform a model estimation of the spin transfer to a ShLLL polarized hadron and sizable asymmetry is expected. Therefore, these newly defined observables for the production of a spin-3/2 hadron in a deep inelastic scattering process can be explored in future experiments to understand nucleon spin structures and spin-dependent fragmentation functions.

关键词： Deep inelastic scattering fragmentation functions Spin

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Quark spin effects in e+e− annihilation: A Monte Carlo event generator study

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Physical Review D 2024年第7期110卷 074029页

作者： A. Kerbizi L. Lönnblad A. Martin Dipartimento di Fisica Department of Physics

Quark spin effects in e+e− annihilation to pseudoscalar and vector mesons are implemented for the first time in the pythia Monte Carlo event generator. The spin-dependent fragmentation of the string stretched between the produced quark-antiquark pair with correlated spin states is described by the string+P30 model implemented in the string fragmentation routine of pythia by using the StringSpinner package. The simulated events are used to study the model predictions for the Collins asymmetries of mesons produced back-to-back in the e+e− center of mass system by using both the thrust axis method and the hadronic plane method. The obtained asymmetries are compared to the available data from the BELLE and BABAR experiments and the underlying Collins analyzing power from the string+P30 model is compared with phenomenological extractions.

关键词： Color confinement fragmentation functions Phenomenology QCD phenomenology Transverse momentum dependent distribution

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Leading order track functions in a hot and dense QGP

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Physical Review D 2024年第3期110卷 L031501-L031501页

作者： João Barata Robert Szafron Physics Department Brookhaven National Laboratory

We study the modifications to the fragmentation pattern of partons into charged particles in the presence of a hot and dense quark gluon plasma. To this end, we analyze the perturbative renormalization group equations of the track functions, which describe the energy fraction carried by charged hadrons. Focusing on pure Yang-Mills theory, we compute the lowest-order moments of the medium-modified track functions, which are found to be sensitive to the reduced phase space for emissions in the medium and to energy loss. We use the extracted moments to calculate the energy energy correlator (EEC) on tracks in the collinear limit. The EEC on medium-evolved tracks does not differ qualitatively from the EEC on vacuum tracks despite being sensitive to the color decoherence transition and suppressing the distribution due to quenching, as seen in other jet observables.

关键词： fragmentation functions Jet quenching Quark-gluon plasma

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Longitudinal and transverse spin transfer to Λ and Λ¯ hyperons in polarized p+p collisions at s=200 GeV

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Physical Review D 2024年第1期109卷 012004-012004页

作者： M. I. Abdulhamid B. E. Aboona J. Adam L. Adamczyk J. R. Adams I. Aggarwal M. M. Aggarwal Z. Ahammed D. M. Anderson E. C. Aschenauer S. Aslam J. Atchison V. Bairathi W. Baker J. G. Ball Cap K. Barish R. Bellwied P. Bhagat A. Bhasin S. Bhatta J. Bielcik J. Bielcikova J. D. Brandenburg X. Z. Cai H. Caines M. Calderón de la Barca Sánchez D. Cebra J. Ceska I. Chakaberia P. Chaloupka B. K. Chan Z. Chang A. Chatterjee D. Chen J. Chen J. H. Chen Z. Chen J. Cheng Y. Cheng S. Choudhury W. Christie X. Chu H. J. Crawford M. Csanád G. Dale-Gau A. Das M. Daugherity I. M. Deppner A. Dhamija L. Di Carlo P. Dixit X. Dong J. L. Drachenberg E. Duckworth J. C. Dunlop J. Engelage G. Eppley S. Esumi O. Evdokimov A. Ewigleben O. Eyser R. Fatemi S. Fazio C. J. Feng Y. Feng E. Finch Y. Fisyak F. A. Flor C. Fu C. A. Gagliardi T. Galatyuk T. Gao F. Geurts N. Ghimire A. Gibson K. Gopal X. Gou D. Grosnick A. Gupta W. Guryn A. Hamed Y. Han S. Harabasz M. D. Harasty J. W. Harris H. Harrison-Smith W. He X. H. He Y. He N. Herrmann L. Holub C. Hu Q. Hu Y. Hu H. Huang H. Z. Huang S. L. Huang T. Huang X. Huang Y. Huang T. J. Humanic D. Isenhower M. Isshiki W. W. Jacobs A. Jalotra C. Jena A. Jentsch Y. Ji J. Jia C. Jin X. Ju E. G. Judd S. Kabana M. L. Kabir S. Kagamaster D. Kalinkin K. Kang D. Kapukchyan K. Kauder D. Keane M. Kelsey Y. V. Khyzhniak D. P. Kikoła B. Kimelman D. Kincses I. Kisel A. Kiselev A. G. Knospe H. S. Ko L. K. Kosarzewski L. Kramarik L. Kumar S. Kumar R. Kunnawalkam Elayavalli R. Lacey J. M. Landgraf J. Lauret A. Lebedev J. H. Lee Y. H. Leung N. Lewis C. Li W. Li X. Li Y. Li Z. Li X. Liang Y. Liang R. Licenik T. Lin M. A. Lisa C. Liu F. Liu G. Liu H. Liu L. Liu T. Liu X. Liu Y. Liu Z. Liu T. Ljubicic W. J. Llope O. Lomicky R. S. Longacre E. M. Loyd T. Lu N. S. Lukow X. F. Luo L. Ma R. Ma Y. G. Ma N. Magdy D. Mallick S. Margetis C. Markert H. S. Matis J. A. Mazer G. McNamara K. Mi S. Mioduszewski B. Mohanty M. M. Mondal I. Mooney A. Mukherjee M. I. Nagy A. S. Nain J. D. Nam M. Nasim D. Neff J. M. Nelson D. B. Nemes M. Nie G. Nigm American University in Cairo New Cairo 11835 Egypt Texas A&M University College Station Texas 77843 Czech Technical University in Prague FNSPE Prague 115 19 Czech Republic AGH University of Krakow FPACS Cracow 30-059 Poland The Ohio State University Columbus Ohio 43210 Panjab University Chandigarh 160014 India Variable Energy Cyclotron Centre Kolkata 700064 India Brookhaven National Laboratory Upton New York 11973 Indian Institute Technology Patna Bihar 801106 India Abilene Christian University Abilene Texas 79699 Instituto de Alta Investigación Universidad de Tarapacá Arica 1000000 Chile University of California Riverside California 92521 University of Houston Houston Texas 77204 University of Jammu Jammu 180001 India State University of New York Stony Brook New York 11794 Nuclear Physics Institute of the CAS Rez 250 68 Czech Republic Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201800 Yale University New Haven Connecticut 06520 University of California Davis California 95616 Lawrence Berkeley National Laboratory Berkeley California 94720 University of California Los Angeles California 90095 Indiana University Bloomington Indiana 47408 National Institute of Technology Durgapur Durgapur—713209 India Shandong University Qingdao Shandong 266237 Fudan University Shanghai 200433 Tsinghua University Beijing 100084 University of California Berkeley California 94720 ELTE Eötvös Loránd University Budapest H-1117 Hungary University of Illinois at Chicago Chicago Illinois 60607 University of Heidelberg Heidelberg 69120 Germany Wayne State University Detroit Michigan 48201 Indian Institute of Science Education and Research (IISER) Berhampur 760010 India Kent State University Kent Ohio 44242 Rice University Houston Texas 77251 University of Tsukuba Tsukuba Ibaraki 305-8571 Japan Lehigh University Bethlehem Pennsylvania 18015 University of Kentucky Lexington Kentucky 40506-0055 University of Calabria & INFN-Cosenza Rend

The longitudinal and transverse spin transfers to Λ (Λ¯) hyperons in polarized proton-proton collisions are expected to be sensitive to the helicity and transversity distributions, respectively, of (anti)strange quarks in the proton, and to the corresponding polarized fragmentation functions. We report improved measurements of the longitudinal spin transfer coefficient, DLL, and the transverse spin transfer coefficient, DTT, to Λ and Λ¯ in polarized proton-proton collisions at s=200 GeV by the STAR experiment at RHIC. The dataset includes longitudinally polarized proton-proton collisions with an integrated luminosity of 52 pb−1, and transversely polarized proton-proton collisions with a similar integrated luminosity. Both datasets have about twice the statistics of previous results and cover a kinematic range of |ηΛ(Λ¯)|<1.2 and transverse momentum pT,Λ(Λ¯) up to 8 GeV/c. We also report the first measurements of the hyperon spin transfer coefficients DLL and DTT as a function of the fractional jet momentum z carried by the hyperon, which can provide more direct constraints on the polarized fragmentation functions.

关键词： fragmentation functions Parton distribution functions Quantum chromodynamics Spin-dependent parton distribution functions Strong interaction

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Measurement of angular and momentum distributions of charged particles within and around jets in Pb plus Pb and pp collisions at √sNN=5.02 TeV with ATLAS at the LHC

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NUCLEAR PHYSICS A 2019年 982卷 177-179页

作者： Puri, Akshat Aaboud, M. Aad, G. Abbott, B. Abdinov, O. Abeloos, B. Abhayasinghe, D. K. Abidi, S. H. AbouZeid, O. S. Abraham, N. L. Abramowicz, H. Abreu, H. Abulaiti, Y. Acharya, B. S. Adachi, S. Adam, L. Adamczyk, L. Adelman, J. Adersberger, M. Adiguzel, A. Adye, T. Affolder, A. A. Afik, Y. Agheorghiesei, C. Aguilar-Saavedra, J. A. Ahmadov, F. Aiellil, G. Akatsuka, S. Akesson, T. P. A. Akilli, E. Akimov, A. V. Alberghi, G. L. Albert, J. Albicocco, P. Alconada Verzini, M. J. Alderweireldt, S. Aleksa, M. Aleksandrov, I. N. Alexa, C. Alexopoulos, T. Alhroob, M. Ali, B. Alimonti, G. Alison, J. Andre, S. P. Allaire, C. Allbrooke, B. M. M. Allen, B. W. Allport, P. P. Aloisio, A. Alonso, A. Alonso, F. Alpigiani, C. Alshehri, A. A. Alstaty, M. I. Gonzalez, B. Alvarez Alvarez Piqueras, D. Alviggi, M. G. Amadio, B. T. Coutinho, Y. Amaral Ambler, A. Ambroz, L. Amelung, C. Amidei, D. Amor Dos Santos, S. P. Amoroso, S. Amrouche, C. S. Anastopoulos, C. Ancu, L. S. Andari, N. Andeen, T. Anders, C. F. Anders, J. K. Anderson, K. J. Andreazza, A. Andrei, V. Anelli, C. R. Angelidakis, S. Angelozzi, I. Angerami, A. Anisenkov, A. V. Annovi, A. Antel, C. Anthony, M. T. Antonelli, M. Antrim, D. J. A. Anulli, F. Aoki, M. Aparisi Pozo, J. A. Bella, L. Aperio Arabidze, G. Araque, J. P. Araujo Ferraz, V. Araujo Pereira, R. Arce, A. T. H. Ardell, R. E. Arduh, F. A. Arguin, J-F. Argyropoulos, S. Armbruster, A. J. Armitage, L. J. Armstrong, A. Arnaez, O. Arnold, H. Arratia, M. Arslan, O. Artamonov, A. Artoni, G. Artz, S. Asai, S. Asbah, N. Asimakopoulou, E. M. Asquith, L. Assamagan, K. Astalos, R. Atkin, R. J. Atkinson, M. Atlay, N. B. Augsten, K. Avolio, G. Avramidou, R. Ayoub, M. K. Azuelos, G. Baas, A. E. Baca, M. J. Bachacou, H. Bachas, K. Backes, M. Bagnaia, P. Bahmani, M. Bahrasemani, H. Bailey, A. J. Baines, J. T. Bajic, M. Bakalis, C. Baker, O. K. Bakker, P. J. Gupta, D. Bakshi Balaji, S. Baldin, E. M. Balek, P. Balli, F. Balunas, W. K. Balz, J. Banas, E. Bandyopadhyay, A. Banerjee, S. Bannoura, A. A. E. Barak, L. Barbe, W. M. Barberi Univ Illinois Champaign IL 61820 USA Univ Adelaide Dept Phys Adelaide SA Australia SUNY Albany Dept Phys Albany NY 12222 USA Univ Alberta Dept Phys Edmonton AB Canada Ankara Univ Dept Phys Ankara Turkey Istanbul Aydin Univ Istanbul Turkey TOBB Univ Econ & Technol Div Phys Ankara Turkey Univ Savoie Mont Blanc Univ Grenoble Alpes CNRS IN2P3LAPP Annecy France Argonne Natl Lab High Energy Phys Div 9700 S Cass Ave Argonne IL 60439 USA Univ Arizona Dept Phys Tucson AZ 85721 USA Univ Texas Arlington Dept Phys POB 19059 Arlington TX 76019 USA Natl & Kapodistrian Univ Athens Phys Dept Athens Greece Natl Tech Univ Athens Phys Dept Zografos Greece Univ Texas Austin Dept Phys Austin TX 78712 USA Bahcesehir Univ Fac Engn & Nat Sci Istanbul Turkey Istanbul Bilgi Univ Fac Engn & Nat Sci Istanbul Turkey Bogazici Univ Dept Phys Istanbul Turkey Gaziantep Univ Dept Engn Phys Gaziantep Turkey Azerbaijan Acad Sci Inst Phys Baku Azerbaijan Barcelona Inst Sci & Technol IFAE Barcelona Spain Chinese Acad Sci Inst High Energy Phys Beijing Peoples R China Tsinghua Univ Phys Dept Beijing Peoples R China Nanjing Univ Dept Phys Nanjing Jiangsu Peoples R China UCAS Beijing Peoples R China Univ Belgrade Inst Phys Belgrade Serbia Univ Bergen Dept Phys & Technol Bergen Norway Lawrence Berkeley Natl Lab Phys Div Berkeley CA USA Univ Calif Berkeley Berkeley CA 94720 USA Humboldt Univ Inst Phys Berlin Germany Univ Bern Albert Einstein Ctr Fundamental Phys Bern Switzerland Univ Bern Lab High Energy Phys Bern Switzerland Univ Birmingham Sch Phys & Astron Birmingham W Midlands England Univ Antonio Narino Ctr Invest Bogota Colombia Univ Bologna Dipartimento Fis & Astron Bologna Italy INFN Sez Bologna Bologna Italy Univ Bonn Phys Inst Bonn Germany Boston Univ Dept Phys 590 Commonwealth Ave Boston MA 02215 USA Brandeis Univ Dept Phys Waltham MA 02254 USA Transilvania Univ Brasov Brasov Romania Horia Hulubei Natl Inst Phys & Nucl Engn

Studies of the fragmentation of jets into charged particles in heavy-ion collisions can help in understanding the mechanism of jet quenching by the hot and dense QCD matter created in such collisions, the quark-gluon plasma. These proceedings present a measurement of the angular distribution of charged particles around the jet axis in root s(NN) = 5.02 TeV Pb+Pb and pp collisions, done using the ATLAS detector at the LHC. The measurement is performed inside jets reconstructed with the anti-k(t) algorithm with radius parameter R = 0.4, and is extended to regions outside the jet cone. Results are presented as a function of Pb+Pb collision centrality, and both jet and charged-particle transverse momenta.

关键词： jets fragmentation functions jet shapes

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

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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

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Quark fragmentation as a probe of dynamical mass generation

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PHYSICS LETTERS B 2019年 798卷 134993-000页

作者： Accardi, Alberto Signori, Andrea Hampton Univ Hampton VA 23668 USA Thomas Jefferson Natl Accelerator Facil Ctr Theory 12000 Jefferson Ave Newport News VA 23606 USA Argonne Natl Lab Div Phys 9700 S Cass Ave Lemont IL 60439 USA Univ Pavia Dipartimento Fis Via Bassi 6 I-27100 Pavia Italy Ist Nazl Fis Nucl Sez Pavia Via Bassi 6 I-27100 Pavia Italy

We address the propagation and hadronization of a struck quark by studying the gauge invariance of the color-averaged cut quark propagator, and by relating this to the single inclusive quark fragmentation correlator by means of new sum rules. Using suitable Wilson lines, we provide a gauge-invariant definition for the mass of the color-averaged dressed quark and decompose this into the sum of a current and an interaction-dependent component. The latter, which we argue is an order parameter for dynamical chiral symmetry breaking, also appears in the sum rule for the twist-3 (E) over tilde fragmentation function, providing a specific experimental way to probe the dynamical generation of mass in Quantum Chromo Dynamics. (C) 2019 The Authors. Published by Elsevier B.V.

关键词： Quarks Hadronization fragmentation functions Mass Chiral symmetry QCD

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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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One loop corrections on fragmentation function of 1S wave charmed mesons

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NUCLEAR PHYSICS A 2017年 960卷 36-52页

作者： Sepahvand, Reza Dadfar, Sareh Lorestan Univ Fac Sci Phys Dept Khorramabad Iran

We present the contribution of the next to leading order (NLO) corrections in fragmentation a c-quark to 1S wave charmed mesons. These corrections are calculated by using the dimensional regularization method. We use two slicing methods that allow the phase space integrals to be evaluated in 4 dimensions. Technical details are discussed about virtual and real corrections in this scheme. Our numerical calculations show the NLO corrections to D mesons fragmentation function (FF) enhance the fragmentation probability (FP). The production ratio of vector mesons D* and D+* to all states is estimated. At NLO, it is obtained a bit smaller than the one at LO. Finally our analytic results are compared with available experimental data for D and D+* mesons. (C) 2017 Elsevier B.V. All rights reserved.

关键词： fragmentation functions Next to leading order corrections Regularization

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