Event activity dependence of υ(nS) production in √SNN = 5.02 TeV pPb and √s = 2.76 TeV pp collisions

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题名:	Event activity dependence of υ(nS) production in √SNN = 5.02 TeV pPb and √s = 2.76 TeV pp collisions
作者:	林宗泰;Blekman, F.;Maes, M.;Van Onsem, G. P.;Popov, A.;Martins, M. Correa;Dias, F. A.;Guo, Y.;Avila, C.;Kadija, K.;Luukka, P.;Jarry, P.;Rosowsky, A.;Sabes, D.;Boudoul, G.;Meyer, A.;Teyssier, D.;Stahl, A.;Bartosik, N.;Lipka, K.;Schoerner-Sadenius, T.;Garutti, E.;Vanelderen, L.;Kuznetsova, E.;Dhingra, N.;Kumar, Arun;Naimuddin, M.;Bhattacharya, S.;Jain, Sa;Chatterjee, R. M.;Ganguly, S.;Mazumdar, K.;Barbone, L.;Colaleo, A.;Castro, A.;Fasanella, D.;Perrotta, A.;Siroli, G. P.;Travaglini, R.;Ferretti, R.;Ragazzi, S.;Gasparini, U.;Vitulo, P.;Dell’Orso, R.;Grippo, M. T.;La Licata, C.;Kim, M. S.;Butt, J.;Zalewski, P.;Kalinowski, A.;Gninenko, S.;Gavrilov, V.;Lychkovskaya, N.;Markina, A.;Ekmedzic, M.;Chamizo Llatas, M.;Albajar, C.;Auffray, E.;Bendavid, J.;Reece, W.;Steggemann, J.;Rohe, T.;Tauscher, L.;De Cosa, A.;Verzetti, M.;Li, S. W.;Asavapibhop, B.;Cerci, S.;Vergili, M.;Aliev, T.;Levchuk, L.;Smith, V. J.;Rose, A.;Cooper, S. I.;Landsberg, G.;Squires, M.;Babb, J.;Holzner, A.;Justus, C.;Jang, D. W.;Sharma, S.;Vidal, R.;Mitselmakher, G.;Baarmand, M. M.;Evdokimov, O.;Ogul, H.;Tan, P.;Wetzel, J.;Barfuss, A. F.;Svintradze, I.;Lai, Y. S.;Stöckli, F.;Snow, G. R.;Barberis, E.;Kubik, A.;Chan, K. M.;Piroué, P.;Stickland, D.;Barker, A.;Duggan, D.;Ferencek, D.
贡献者:	理學院物理學系
关键词:	Classical and Quantum Gravitation;Collisions;Cross sections;Deposition;Elementary Particles;Intervals;Lead (metal);Nucleons;Physics;Physics and Astronomy;Quantum Field Theories;Quantum Field Theory;Quantum Physics;Relativity Theory;Solenoids;String Theory
日期:	2014-01-01
上传时间:	2026-04-23 11:53:36 (UTC+8)
出版者:	Berlin/Heidelberg: Springer Berlin Heidelberg
摘要:	摘要： A bstract The production of (1S), (2S), and (3S) is investigated in pPb and pp collisions at centre-of-mass energies per nucleon pair of 5.02 TeV and 2.76 TeV, respectively. The datasets correspond to integrated luminosities of about 31 nb −1 (pPb) and 5.4 pb −1 (pp), collected in 2013 by the CMS experiment at the LHC. Upsilons that decay into muons are reconstructed within the rapidity interval \| y CM \| < 1 . 93 in the nucleon-nucleon centre-of-mass frame. Their production is studied as a function of two measures of event activity, namely the charged-particle multiplicity measured in the pseudorapidity interval \| η \| < 2 . 4, and the sum of transverse energy deposited at forward pseudorapidity, 4 . 0 < \| η \| < 5 . 2. The cross sections normalized by their event activity integrated values, (nS) / 〈 (nS)〉, are found to rise with both measures of the event activity in pp and pPb. In both collision systems, the ratios of the excited to the ground state cross sections, (nS) / (1S), are found to decrease with the charged-particle multiplicity, while as a function of the transverse energy the variation is less pronounced. The event activity integrated double ratios, [ (nS) / (1S)] pPb / [ (nS) / (1S)] pp , are also measured and found to be 0 . 83 ± 0 . 05 (stat . ) ± 0 . 05 (syst . ) and 0 . 71 ± 0 . 08 (stat . ) ± 0 . 09 (syst . ) for (2S) and (3S), respectively. 其他題名： J. High Energ. Phys 出版者： Berlin/Heidelberg: Springer Berlin Heidelberg 出版日期： 2014-04-15 出處： The journal of high energy physics, 2014-04, Vol.2014 (4), p.1-37 資源來源： Publicly Available Content Database 版權： The Author(s) 2014 識別號： EISSN: 1029-8479 識別號： DOI: 10.1007/JHEP04(2014)103
显示于类别:	[物理學系] 期刊論文

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