Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √sNN = 2.76 TeV

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/107889

Title:	Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √sNN = 2.76 TeV
Authors:	林宗泰;Chatrchyan, S;Tumasyan, A;Frühwirth, R;Jeitler, M;Knünz, V;Clerbaux, B;Gay, A P;R;Adler, V;Thyssen, F;thomme, L;Jez, P;Caebergs, T;De Jesus Damiao, D;Gregores, E M;Lagana, C;Piperov, S;Hadjiiska, R;Liang, D;Peltola, T;Locci, E;Dahms, T;Dobrzynski, L;Veelken, C;Costanza, F;Dooling, S;Blobel, V;Görner, M;Peiffer, T;Chwalek, T;Gomber, B;Majumder, G;Sudhakar, K;Maggi, M;Zito, G;Bonacorsi, D;Campanini, R;Cuffiani, M;Masetti, G;Giordano, F;Gallo, E;Ferro, F;Lacaprara, S;Riccardi, C;Kraan, A;Solano, A;Tamponi, U;Park, H;Shoaib, M;Misiura, M;Andreev, V;Troshin, S;Vázquez, D Domínguez;Pelayo, J Puerta;Albajar, C;Cuevas, J;Caballero, I Gonzalez;Bloch, P;Janot, P;Rolandi, G;Vlimant, J R;Kotlinski, D;Langenegger, U;Mohr, N;Hreus, T;Volpe, R;Suwonjandee, N;Yalvac, M;Flacher, H;Dauncey, P;Lane, R;Ferapontov, A;Padhi, S;Tu, Y;Incandela, J;Pavlunin, V;To, W;Patterson, J R;Butler, J N;Linacre, J;Bochenek, J;Kalakhety, H;Barnett, B A;Saini, L K;Apyan, A;Luckey, P D;Perera, L;Bose, S;Alagoz, E;Maroussov, V;Wang, F;Xie, W;Goulianos, K;Duggan, D;Schnetzer, S;Seitz, C;Kamon, T;Roe, J;Lee, S W;Loveless, R;Savin, A
Contributors:	理學院物理學系
Keywords:	High energy physics
Date:	2014-01-01
Issue Date:	2026-04-23 14:27:59 (UTC+8)
Publisher:	Heidelberg: Springer Nature B.V
Abstract:	摘要： (ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) Abstract Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at ...=2.76TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 [mu]b-1. The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v ^sub 2^ to v ^sub 6^, are extracted as a function of particle transverse momentum. At higher transverse momentum, the v ^sub 2^ harmonic becomes significantly smaller than the higher-order v ^sub n^ (n[greater than or equal to]3). The p ^sub T^-averaged v ^sub 2^ and v ^sub 3^ are found to be equal within 2%, while higher-order v ^sub n^ decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-by-event fluctuating initial conditions is also presented. [Figure not available: see fulltext.] 出版者： Heidelberg: Springer Nature B.V 出版日期： 2014-02-01 出處： The journal of high energy physics, 2014-02, Vol.2014 (2), p.1 資源來源： ProQuest Open Access Content Collection 版權： SISSA, Trieste, Italy 2014 識別號： EISSN: 1029-8479 識別號： DOI: 10.1007/JHEP02(2014)088
Appears in Collections:	[Department of Physics] journal & Dissertation

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