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| 題名: | Long-range two-particle correlations of strange hadrons with charged particles in pPb and PbPb collisions at LHC energies |
| 作者: | 余欣珊;Levine, Aaron;Poehlsen, Jennifer;Apresyan, Artur;Bagliesi, Giuseppe;Velkovska, Julia;Varelas, Nikos;Seva, Tomislav;Innocente, Vincenzo;Swain, Sanjay Kumar;Hadjiiska, Roumyana;Gascon, Susan;Geiser, Achim;Spalding, William J;Shukla, Prashant;Colaleo, Anna;Piotrzkowski, Krzysztof;Steinbrück, Georg;Avetisyan, Aram;Rose, Anthony;Elliott-Peisert, Anna;Farrell, Chris;Mittal, Monika;Pant, Lalit Mohan;Tricomi, Alessia;Martinez, German;Cockerill, David JA;Ferencek, Dinko;Marchesini, Ivan;Haas, Jeff;Christopher, Grant;Tosi, Nicolò;Ekmedzic, Marko;Lu, Ying;Brooke, James John;Mott, Alexander;Ahmad, Ashfaq;Mohanty, Ajit Kumar;Spiropulu, Maria;De Moraes Gregores, Eduardo;Malcles, Julie;Dewanjee, Ram Krishna;Tamponi, Umberto;Jain, Shilpi;Luyckx, Sten;Danielson, Thomas;Fabbri, Fabrizio;Berry, Edmund;Chwalek, Thorsten;Dupont-Sagorin, Niels;Paktinat Mehdiabadi, Saeid;Szillasi, Zoltan;Bauer, Gerry;Woods, Nathaniel;Hatakeyama, Kenichi;Kazana, Malgorzata;Dumanoglu, Isa;Frueboes, Tomasz;Bachtis, Michail;Costa, Salvatore;Gerosa, Raffaele;Letts, James;Kim, Tae Jeong;Saka, Halil;Skatchkov, Nikolai;Piparo, Danilo;Van Mechelen, Pierre;Castaneda Hernandez, Alfredo;Fulcher, Jonathan;West, Christopher;Gomez, Gervasio;Gninenko, Sergei;Dinardo, Mauro Emanuele;Ptochos, Fotios;Timciuc, Vladlen;Wilken, Rachel;Ford, William T;Damgov, Jordan;Chao, Yuan;Beri, Suman Bala;Cankocak, Kerem;Van Remortel, Nick;Rodozov, Mircho;Halkiadakis, Eva;Navarria, Francesco;Girgis, Semiray;Bellan, Riccardo;Kim, Gui Nyun;Sanders, Stephen;Chang, Sunghyun;Brochet, Sébastien;De La Cruz, Begona;Goldstein, Joel;Naumann-Emme, Sebastian;George, Christopher;Wolszczak, Weronika;Vavilov, Sergey;Dugad, Shashikant;Snow, Gregory R;Gilbert, Andrew;de Trocóniz, Jorge F |
| 貢獻者: | 理學院物理學系 |
| 關鍵詞: | CMS;Correlations;Experiment;Flow;High Energy Physics - Experiment;High-multiplicity;Long-range;Nuclear Experiment;Nuclear Physics;Physics;PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;Ridge |
| 日期: | 2015-03-06 |
| 上傳時間: | 2026-04-23 12:08:31 (UTC+8) |
| 出版者: | Netherlands: Elsevier B.V |
| 摘要: | 摘要： Measurements of two-particle angular correlations between an identified strange hadron (${\rm K}^0_{\rm S}$ or $\Lambda$/$\overline{\Lambda}$) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 nb$^{-1}$, were collected at a nucleon-nucleon center-of-mass energy ($\sqrt{s_{NN}}$) of 5.02 TeV with the CMS detector at the LHC. The results are compared to semi-peripheral PbPb collision data at $\sqrt{s_{NN}}$ = 2.76 TeV, covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order ($v_2$) and third-order ($v_3$) anisotropy harmonics of ${\rm K}^0_{\rm S}$ and $\Lambda$/$\overline{\Lambda}$ particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of $v_2$ and $v_3$ is observed. For $p_{\rm T}$ $<$ 2 GeV, the $v_2$ and $v_3$ values of ${\rm K}^0_{\rm S}$ particles are larger than those of $\Lambda$/$\overline{\Lambda}$ particles at the same $p_{\rm T}$. This splitting effect between two particle species is found to be stronger in pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both $v_2$ and $v_3$ for ${\rm K}^0_{\rm S}$ particles are observed to be consistent with those for $\Lambda$/$\overline{\Lambda}$ particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities. Measurements of two-particle angular correlations between an identified strange hadron ( KS0 or Λ/Λ¯ ) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 nb −1 , were collected at a nucleon–nucleon center-of-mass energy ( sNN ) of 5.02 TeV with the CMS detector at the LHC. The results are compared to semi-peripheral PbPb collision data at sNN=2.76 TeV , covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order ( v2 ) and third-order ( v3 ) anisotropy harmonics of KS0 and Λ/Λ¯ particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v2 and v3 is observed. For pT<2 GeV , the v2 and v3 values of KS0 particles are larger than those of Λ/Λ¯ particles at the same pT . This splitting effect between two particle species is found to be stronger in pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both v2 and v3 for KS0 particles are observed to be consistent with those for Λ/Λ¯ particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities. Measurements of two-particle angular correlations between an identified strange hadron ( KS0 or Λ/Λ‾ ) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 nb −1 , were collected at a nucleon–nucleon center-of-mass energy ( sNN ) of 5.02 TeV with the CMS detector at the LHC. The results are compared to semi-peripheral PbPb collision data at sNN=2.76 TeV , covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order ( v2 ) and third-order ( v3 ) anisotropy harmonics of KS0 and Λ/Λ‾ particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v2 and v3 is observed. For pT<2 GeV , the v2 and v3 values of KS0 particles are larger than those of Λ/Λ‾ particles at the same pT . This splitting effect between two particle species is found to be stronger in pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both v2 and v3 for KS0 particles are observed to be consistent with those for Λ/Λ‾ particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities. Measurements of two-particle angular correlations between an identified strange hadron (K0S or Lambda/anti-Lambda) and a charged particle, emitted in pPb collisions, are presented over a wide range in pseudorapidity and full azimuth. The data, corresponding to an integrated luminosity of approximately 35 inverse nanobarns, were collected at a nucleon-nucleon center-of-mass energy (sqrt(s[NN])) of 5.02 TeV with the CMS detector at the LHC. The results are compared to semi-peripheral PbPb collision data at sqrt(s[NN]) = 2.76 TeV, covering similar charged-particle multiplicities in the events. The observed azimuthal correlations at large relative pseudorapidity are used to extract the second-order (v[2]) and third-order (v[3]) anisotropy harmonics of K0S and Lambda/anti-Lambda particles. These quantities are studied as a function of the charged-particle multiplicity in the event and the transverse momentum of the particles. For high-multiplicity pPb events, a clear particle species dependence of v[2] and v[3] is observed. For pt < 2 GeV, the v[2] and v[3] values of K0S particles are larger than those of Lambda/anti-Lambda particles at the same pt. This splitting effect between two particle species is found to be stronger in pPb than in PbPb collisions in the same multiplicity range. When divided by the number of constituent quarks and compared at the same transverse kinetic energy per quark, both v[2] and v[3] for K0S particles are observed to be consistent with those for Lambda/anti-Lambda particles at the 10% level in pPb collisions. This consistency extends over a wide range of particle transverse kinetic energy and event multiplicities.
出版者： Netherlands: Elsevier B.V
出版日期： 2015-03-06
出處： Physics letters. B, 2015-03, Vol.742 (C), p.200-224
資源來源： Elsevier ScienceDirect Journals Complete
版權： 2015 The Authors
版權： CC0 1.0 - Universal
識別號： ISSN: 0370-2693
識別號： ISSN: 1873-2445
識別號： EISSN: 1873-2445
識別號： DOI: 10.1016/j.physletb.2015.01.034 |
| 顯示於類別: | [物理學系] 期刊論文
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