Measurement of the ratio of the production cross sections times branching fractions of Bc±→ J/ψπ± and B± → J/ψK± and (Formula presented.) in pp collisions at (Formula presented.) TeV

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题名:	Measurement of the ratio of the production cross sections times branching fractions of Bc±→ J/ψπ± and B± → J/ψK± and (Formula presented.) in pp collisions at (Formula presented.) TeV
作者:	林宗泰;Khachatryan, Vardan
贡献者:	理學院物理學系
关键词:	B physics;branching fraction;hadron-hadron scattering
日期:	2015-01-01
上传时间:	2026-04-23 12:16:37 (UTC+8)
出版者:	United States: Springer Berlin
摘要:	摘要： The ratio of the production cross sections times branching fractions (σ(B±c)B(B±c→J/ψπ±))/(σ(B±)B(B±→J/ψK±)) is studied in proton-proton collisions at a center of-mass energy of 7 TeV with the CMS detector at the LHC. The kinematic region investigated requires B c ± and B± mesons with transverse momentum p T > 15 GeV and rapidity \|y\|< 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb-1. The ratio is determined to be [0.48±0.05(stat)± 0.03(syst)±0.05 (τBc)]%. The B c ± → J/ψπ ± π ± π ∓ decay is also observed in the same data sample. Using a model-independent method developed to measure the efficiency given the presence of resonant behaviour in the three-pion system, the ratio of the branching fractions B(B±c→J/ψπ±π±π∓)/B(B±c→J/ψπ±) is measured to be 2.55±0.80(stat)±0.33(syst)+0.04-0.01(τBc), consistent with the previous LHCb result. 出版者： United States: Springer Berlin 出版日期： 2015-01-13 出處： The journal of high energy physics, 2015-01, Vol.2015 (1) 資源來源： Publicly Available Content Database 識別號： ISSN: 1029-8479 識別號： DOI: 10.1007/JHEP01(2015)063
显示于类别:	[物理學系] 期刊論文

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