Measurement of the ratio of the production cross sections times branching fractions of B-c(+/-) -˃ J/psi pi(+/-) and B-+/- -˃ J/psi K-+/- and B(B-c(+/-) -˃ J/psi pi(+/-)pi(+/-)pi(-/+))/B(B-c(+/-) -˃ J/psi pi(+/-)) in pp collisions at root s=7 Tevopen access
- Authors
- Khachatryan, V; Sirunyan, AM; Tumasyan, A; Adam, W; Bergauer, T; Dragicevic, M; Eroe, J; Fabjan, C; Friedl, M; Kim, Tae Jeong
- Issue Date
- Jan-2015
- Publisher
- SPRINGER
- Keywords
- B physics; Branching fraction; Hadron-Hadron Scattering
- Citation
- JOURNAL OF HIGH ENERGY PHYSICS, v.2015, no.1, pp.1 - 30
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF HIGH ENERGY PHYSICS
- Volume
- 2015
- Number
- 1
- Start Page
- 1
- End Page
- 30
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/143257
- DOI
- 10.1007/JHEP01(2015)063
- ISSN
- 1126-6708
- Abstract
- The ratio of the production cross sections times branching fractions (sigma(B-c(+/-))B(B-c(+/-) -˃ J/psi pi(+/-)))/(sigma(B-+/-)B(B-+/- -˃ J/psi K-+/-)) is studied in proton-proton collisions at a center-of-mass energy of 7TeV 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 vertical bar y vertical bar ˂ 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 (tau(Bc))]%. The B-c(+/-) -˃ J/psi pi(+/-)pi(+/-)pi(-/+) 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-c(+/-) -˃ J/psi pi(+/-)pi(+/-)pi(-/+)/B(B-c(+/-) -˃ J/psi pi(+/-)) is measured to be 2.55 +/- 0.80 (stat) +/- 0.33 (syst)(-0.01)(+0.04) (tau(Bc)), consistent with the previous LHCb result.
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