Observation of long-range, near-side angular correlations in pPb collisions at the LHC

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题名:	Observation of long-range, near-side angular correlations in pPb collisions at the LHC
作者:	林宗泰;Apresyan, Artur;Bagliesi, Giuseppe;Velkovska, Julia;Varelas, Nikos;Innocente, Vincenzo;Hadjiiska, Roumyana;Gascon, Susan;Geiser, Achim;Spalding, William J;Markina, Anastasia;Chang, Yuan-Hann;Shukla, Prashant;Colaleo, Anna;Piotrzkowski, Krzysztof;Steinbrück, Georg;Avetisyan, Aram;Elliott-Peisert, Anna;Farrell, Chris;Pant, Lalit Mohan;Tricomi, Alessia;Martinez, German;Cockerill, David JA;Nappi, Aniello;Ferencek, Dinko;Haas, Jeff;Christopher, Grant;Tosi, Nicolò;Ekmedzic, Marko;Lu, Ying;Hollingsworth, Matthew;Brooke, James John;Thomsen, Jan;Mott, Alexander;Mohanty, Ajit Kumar;Spiropulu, Maria;De Moraes Gregores, Eduardo;Malcles, Julie;Jain, Shilpi;Luyckx, Sten;Danielson, Thomas;Fabbri, Fabrizio;Berry, Edmund;Chwalek, Thorsten;Dupont-Sagorin, Niels;Paktinat Mehdiabadi, Saeid;Szillasi, Zoltan;Bauer, Gerry;Hatakeyama, Kenichi;Kazana, Malgorzata;Dumanoglu, Isa;Frueboes, Tomasz;Segoni, Ilaria;Bachtis, Michail;Costa, Salvatore;Letts, James;Kim, Tae Jeong;Saka, Halil;Piparo, Danilo;Van Mechelen, Pierre;Vanini, Sara;Gulmini, Michele;Fulcher, Jonathan;West, Christopher;Gomez, Gervasio;Gninenko, Sergei;Dinardo, Mauro Emanuele;Ptochos, Fotios;Timciuc, Vladlen;Wilken, Rachel;Ford, William T;Kovalskyi, Dmytro;Damgov, Jordan;Boimska, Bozena;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;Kalavase, Puneeth;De La Cruz, Begona;Laasanen, Alvin T;Goldstein, Joel;Naumann-Emme, Sebastian;George, Christopher;Vavilov, Sergey;Dugad, Shashikant;Snow, Gregory R;Gilbert, Andrew;de Trocóniz, Jorge F;Kayis Topaksu, Aysel;Zhokin, Alexander;Mccartin, Joseph
贡献者:	理學院物理學系
关键词:	Angular correlation;Charged particles;CMS;Collisions;Correlation;Elementary particles;Emittance;Energy (nuclear);Experiment;Heavy ions;Nuclear Physics;Physics;Strength
日期:	2013-01-08
上传时间:	2026-04-23 12:33:59 (UTC+8)
出版者:	Elsevier;Netherlands: Elsevier B.V
摘要:	摘要： Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collisions collected with the CMS detector at the LHC. The correlations are studied over a broad range of pseudorapidity, eta, and full azimuth, phi, as a function of charged particle multiplicity and particle transverse momentum, pt. In high-multiplicity events, a long-range (2<abs(Delta(eta))<4), near-side (Delta(phi) approximately 0) structure emerges in the two-particle Delta(eta)-Delta(phi) correlation functions. This is the first observation of such correlations in proton-nucleus collisions, resembling the ridge-like correlations seen in high-multiplicity pp collisions at sqrt(s) = 7 TeV and in A on A collisions over a broad range of center-of-mass energies. The correlation strength exhibits a pronounced maximum in the range of pt = 1-1.5 GeV and an approximately linear increase with charged particle multiplicity for high-multiplicity events. These observations are qualitatively similar to those in pp collisions when selecting the same observed particle multiplicity, while the overall strength of the correlations is significantly larger in pPb collisions. Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon–nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collisions collected with the CMS detector at the LHC. The correlations are studied over a broad range of pseudorapidity, η , and full azimuth, ϕ , as a function of charged particle multiplicity and particle transverse momentum, pT . In high-multiplicity events, a long-range ( 2<\|Δη\|<4 ), near-side ( Δϕ≈0 ) structure emerges in the two-particle Δ η –Δ ϕ correlation functions. This is the first observation of such correlations in proton–nucleus collisions, resembling the ridge-like correlations seen in high-multiplicity pp collisions at s=7 TeV and in AA collisions over a broad range of center-of-mass energies. The correlation strength exhibits a pronounced maximum in the range of pT=1–1.5 GeV/c and an approximately linear increase with charged particle multiplicity for high-multiplicity events. These observations are qualitatively similar to those in pp collisions when selecting the same observed particle multiplicity, while the overall strength of the correlations is significantly larger in pPb collisions. Results on two-particle angular correlations for charged particles emitted in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV are presented. The analysis uses two million collisions collected with the CMS detector at the LHC. The correlations are studied over a broad range of pseudorapidity, eta, and full azimuth, phi, as a function of charged particle multiplicity and particle transverse momentum, pt. In high-multiplicity events, a long-range (2 < abs(Delta(eta)) < 4), near-side (Delta(phi) approximately 0) structure emerges in the two-particle Delta(eta)-Delta(phi) correlation functions. This is the first observation of such correlations in proton-nucleus collisions, resembling the ridge-like correlations seen in high-multiplicity pp collisions at sqrt(s) = 7 TeV and in AA collisions over a broad range of center-of-mass energies. The correlation strength exhibits a pronounced maximum in the range of pt = 1-1.5 GeV and an approximately linear increase with charged particle multiplicity for high-multiplicity events. These observations are qualitatively similar to those in pp collisions when selecting the same observed particle multiplicity, while the overall strength of the correlations is significantly larger in pPb collisions. 出版者： Netherlands: Elsevier B.V 出版日期： 2013-01-08 出處： Physics Letters B, 2013-01, Vol.718 (3), p.795-814 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2012 CERN 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.2012.11.025
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