Measurement of the ratio of the production cross sections times branching fractions of B [superscript ±][subscript c] → [J over ψπ [superscript ±]] and B[superscript ±] → [J over ψK [superscript ±]] and ℬ(B [superscript ±][subscript c] → [J over Ψ π [superscript ±] π [superscript ±] π [superscript ∓] [over ℬ(B [superscript ±][subscript c] → J [over Ψ π [superscript ±]]) in pp collisions at √s = 7 TeV
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Author(s)
Apyan, Aram
Busza, Wit
Cali, Ivan Amos
Chan, M.
Di Matteo, Leonardo
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Klute, Markus
Lai, Yue Shi
Date Issued
January 2015
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag
Citation
The CMS collaboration et al. “Measurement of the Ratio of the Production Cross Sections Times Branching Fractions of B [superscript ±][subscript c] → [J over ψπ [superscript ±]] and B[superscript ±] → [J over ψK [superscript ±]] and ℬ(B [superscript ±][subscript c] → [J over Ψ π [superscript ±] π [superscript ±] π [superscript ∓] [over ℬ(B [superscript ±][subscript c] → J [over Ψ π [superscript ±]]) in Pp Collisions at √s = 7 TeV.” Journal of High Energy Physics 2015.1 (2015): 1-13.
Version
Final published version
Abstract
The ratio of the production cross sections times branching fractions (σ(B[superscript ± [subscript c])B(B[superscript ±] [subscript c]→J[over ψπ [superscript ±]])) [over (σ(B [superscript ±])B(B[superscript ±]→J/ψK[superscript ±]))] 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 [subscript c] [superscript ±] and B[superscript ±] mesons with transverse momentum p [subscript T] > 15 GeV and rapidity |y| < 1.6. The data sample corresponds to an integrated luminosity of 5.1 fb [superscript −1]. The ratio is determined to be [0.48±0.05(stat)±0.03(syst)±0.05 (τB[subscript c])]% . The B [subscript c] [superscript ±] → J [over ψπ [superscript ±] π [superscript ±] π [superscript ∓]] 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[superscript ±][subscript c]→J [over ψπ [superscript ±] π [superscript ±] π [superscript ∓]]) [over B(B[superscript ±] [subscript c] →J [over ψπ[superscript ±]])] is measured to be 2.55±0.80(stat)±0.33(syst)[superscript +0.04][subscript −0.01](τB[subscript c]) , consistent with the previous LHCb result.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Massachusetts Institute of Technology. School of Science
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DOI of Published Version
https://doi.org/10.1007/JHEP01(2015)063
