Measurement of the Λ b cross section and the Λ- b to Λ b ratio with J/ψΛ decays in pp collisions at s=7 TeV

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题名:	Measurement of the Λ b cross section and the Λ- b to Λ b ratio with J/ψΛ decays in pp collisions at s=7 TeV
作者:	林宗泰;Chatrchyan, S.;Wagner, P.;Waltenberger, W.;Roland, B.;Blyweert, S.;Van Onsem, G.P.;Vanelderen, L.;Schul, N.;Beliy, N.;Mundim, L.;Genchev, V.;Guo, S.;Li, W.;Qian, S.J.;Mahmoud, M.A.;Kadastik, M.;Tuominiemi, J.;Cardaci, M.;Chasserat, J.;Perieanu, A.;Lingemann, J.;Haj Ahmad, W.;Aldaya Martin, M.;Mnich, J.;Kaussen, G.;Honc, S.;Ratnikova, N.;Kailas, S.;Travaglini, R.;Paganoni, M.;Lacaprara, S.;Potenza, A.;Jo, H.Y.;Kim, M.S.;Golutvin, I.;Smirnov, V.;Zarubin, A.;Ivanov, Y.;Belyaev, A.;Markina, A.;De La Cruz, B.;Fernandez Menendez, J.;Cabrillo, I.J.;Bonato, A.;Hinzmann, A.;Mannelli, M.;Rovelli, C.;Siegrist, P.;Mohr, N.;Sala, L.;Takahashi, M.;Deniz, M.;Kaya, O.;Ozkorucuklu, S.;Bell, K.W.;Cockerill, D.J.A.;Davies, G.;Liu, H.;Sperka, D.;Kukartsev, G.;Breedon, R.;Erbacher, R.;Miceli, T.;Pellett, D.;Schlein, P.;Yoo, J.;Duarte, J.;Jang, D.W.;Agostino, L.;Ryd, A.;Weng, Y.;Albrow, M.;Lueking, L.;Bourilkov, D.;Konigsberg, J.;Snowball, M.;Gaultney, V.;Veeraraghavan, V.;Akgun, U.;Yi, K.;Giurgiu, G.;Sanders, S.;Stephans, G.S.F.;Velicanu, D.;Yoon, A.S.;Dahmes, B.;Keller, J.;Chasco, M.;Lannon, K.;Slaunwhite, J.;Valls, N.;Acosta, J.G.;Barnes, V.E.;Ecklund, K.M.;Gotra, Y.;Goulianos, K.;Lungu, G.;Schnetzer, S.;Khotilovich, V.;Appelt, E.
贡献者:	理學院物理學系
关键词:	B physics;CMS;Exact sciences and technology;Nuclear physics;Physics;The physics of elementary particles and fields
日期:	2012-08-14
上传时间:	2026-04-23 12:23:21 (UTC+8)
出版者:	Kidlington: Elsevier B.V
摘要:	摘要： The Λb differential production cross section and the cross section ratio σ(Λ¯b)/σ(Λb) are measured as functions of transverse momentum pTΛb and rapidity \|yΛb\| in pp collisions at s=7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Λb decays reconstructed in the exclusive final state J/ψΛ, with the subsequent decays J/ψ→μ+μ− and Λ→pπ, using a data sample corresponding to an integrated luminosity of 1.9 fb−1. The product σ(Λb)×B(Λb→J/ψΛ) versus pTΛb falls faster than that of b mesons. The measured value of σ(Λb)×B(Λb→J/ψΛ) for pTΛb>10 GeV and \|yΛb\|<2.0 is 1.16±0.06±0.12 nb, and the integrated σ(Λ¯b)/σ(Λb) ratio is 1.02±0.07±0.09, where the uncertainties are statistical and systematic, respectively. 出版者： Kidlington: Elsevier B.V 出版日期： 2012-08-14 出處： Physics letters. B, 2012-08, Vol.714 (2-5), p.136-157 資源來源： Elsevier ScienceDirect Journals 版權： 2012 CERN 版權： 2015 INIST-CNRS 識別號： ISSN: 0370-2693 識別號： EISSN: 1873-2445 識別號： DOI: 10.1016/j.physletb.2012.05.063 識別號： CODEN: PYLBAJ
显示于类别:	[物理學系] 期刊論文

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