"Measurement of the ratio of the production cross sections times branch" by The CMS Collaboration, V. Khachatryan et al.
 

Document Type

Article

Publication Title

Journal of High Energy Physics

Abstract

The ratio of the production cross sections times branching fractions (σ(B±c)B(B±cJ/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±cJ/ψπ±π±π∓)/B(B±cJ/ψπ±) is measured to be 2.55±0.80(stat)±0.33(syst)+0.04-0.01(τBc), consistent with the previous LHCb result.

DOI

doi:10.1007/JHEP01(2015)063

Publication Date

1-2015

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