Measurement of the ratio of the production cross sections times branching fractions of Bc± → J/ψπ± and B± → J/ψK± and B(B±c→J/ψπ±π±π∓)/B(B±c→J/ψπ±) in pp collisions at s√=7 TeV
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Issue Date
2015-01-13Author
Baringer, Philip S.
Bean, Alice
Murray, Michael J.
Sanders, Stephen J.
CMS Collaboration
Publisher
Springer Verlag
Type
Article
Article Version
Scholarly/refereed, publisher version
Rights
Open Access, Copyright CERN, for the benefit of the CMS Collaboration.
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Show full item recordAbstract
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 Bc± and B± mesons with transverse momentum pT > 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 Bc± → 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.
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Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., Dragicevic, M., … Frühwirth, R. (2015). Measurement of the ratio of the production cross sections times branching fractions of Bc± → J/ψπ± and B± → J/ψK± and B(B±c→J/ψπ±π±π∓)/B(B±c→J/ψπ±) in pp collisions at s√=7 TeV. J. High Energ. Phys., 2015(1). doi:10.1007/jhep01(2015)063
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