Measurement of the υ(1S), υ(2S), and υ(3S) polarizations in pp collisions at √s=7 TeV

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题名:	Measurement of the υ(1S), υ(2S), and υ(3S) polarizations in pp collisions at √s=7 TeV
作者:	余欣珊;Chatrchyan, S;Tumasyan, A;Van Mulders, P;Bruno, G;thomme, L;Pin, A;Beliy, N;Da Costa, E M;Genchev, V;Stoykova, S;Sultanov, G;Lelas, D;Luetic, J;Rebane, L;Fedi, G;Salerno, R;Viret, S;Sammet, J;Steggemann, J;Diez Pardos, C;Feindt, M;Hauth, T;Niegel, M;Oehler, A;Kyriakis, A;Sikler, F;Molnar, J;Kumar, V;Nuzzo, S;Travaglini, R;Barbagli, G;Paolucci, P;Santocchia, A;Biino, C;Costa, M;Park, H;Son, T;Park, S K;Krofcheck, D;Khurshid, T;Bargassa, P;Volodko, A;Kim, V;Dudko, L;Kirakosyan, M;Tourtchanovitch, L;Puerta Pelayo, J;Vilar Cortabitarte, R;Cerminara, G;Dobson, M;Glege, F;Innocente, V;Mulders, M;Pfeiffer, A;Polese, G;Santanastasio, F;Rohe, T;Robmann, P;Snoek, H;Chang, Y H;Dozen, C;Hos, I;Vergili, M;Zeyrek, M;Papageorgiou, A;Vasquez Sierra, R;Babb, J;Luthra, A;Andrews, W;Palmer, C;Tadel, M;Krutelyov, V;Magaña Villalba, R;Teo, W D;Green, D;Lipton, R;Fisher, M;Yumiceva, F;Betts, R R;Hofman, D J;Khalatyan, S;Clarida, W;Wright, D;Kirn, M;Levin, A;Franzoni, G;Turkewitz, J;Kharchilava, A;Trocino, D;Lusito, L;Lannon, K;Durkin, L S;Jones, M;Guragain, S;Ecklund, K M;Panwalkar, S;Gilmore, J;Damgov, J;Melo, A;Cox, B
贡献者:	理學院物理學系
日期:	2013-02-20
上传时间:	2026-04-23 12:24:46 (UTC+8)
摘要:	摘要： The polarizations of the Υ(1S), Υ(2S), and Υ(3S) mesons are measured in proton-proton collisions at sqrt[s] = 7 TeV, using a data sample of Υ(nS) → μ +μ- decays collected by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb(-1). The dimuon decay angular distributions are analyzed in three different polarization frames. The polarization parameters λ[symbol see text], λ(φ), and λ([symbol see text]φ), as well as the frame-invariant quantity λ, are presented as a function of the Υ(nS) transverse momentum between 10 and 50 GeV, in the rapidity ranges \|y\|<0.6 and 0.6<\|y\|<1.2. No evidence of large transverse or longitudinal polarizations is seen in the explored kinematic region.The polarizations of the Υ(1S), Υ(2S), and Υ(3S) mesons are measured in proton-proton collisions at sqrt[s] = 7 TeV, using a data sample of Υ(nS) → μ +μ- decays collected by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb(-1). The dimuon decay angular distributions are analyzed in three different polarization frames. The polarization parameters λ[symbol see text], λ(φ), and λ([symbol see text]φ), as well as the frame-invariant quantity λ, are presented as a function of the Υ(nS) transverse momentum between 10 and 50 GeV, in the rapidity ranges \|y\|<0.6 and 0.6<\|y\|<1.2. No evidence of large transverse or longitudinal polarizations is seen in the explored kinematic region. 出版日期： 2013-02-22 出處： Physical review letters, 2013-02, Vol.110 (8), p.081802 資源來源： American Physical Society Journals 識別號： ISSN: 1079-7114 識別號： EISSN: 1079-7114 識別號： DOI: 10.1103/PhysRevLett.110.081802
显示于类别:	[物理學系] 期刊論文

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