Measurement of the ratio of the production cross sections times branching fractions of Bc+/- to J/psi pi+/- and B+/- to J/psi K+/- and B(Bc+/- to J/psi pi+/- pi+/- pi-/+)/B(Bc+/- to J/psi pi+/-) in pp collisions at sqrt(s) = 7 TeV

CMS;Basegmez, Suzan;Beluffi, Camille;Bruno, Giacomo;Bethani, Agni;et.al.
(2015) Journal of High Energy Physics — Vol. 1501, p. 63 (2015)

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Authors
  • CMSUCLouvain
    Author
  • Basegmez, SuzanUCLouvain
    Author
  • Beluffi, CamilleUCLouvain
    Author
  • Bruno, GiacomoUCLouvain
    Author
  • Castello, RobertoUCLouvain
    Author
  • Caudron, AdrienUCLouvain
    Author
  • Ceard, LudivineUCLouvain
    Author
  • Da Silveira, Gustavo GilUCLouvain
    Author
  • Delaere, Christopheorcid-logoUCLouvain
    Author
  • Du Pree, TristanUCLouvain
    Author
  • Favart, DenisUCLouvain
    Author
  • Forthomme, LaurentUCLouvain
    Author
  • Giammanco, Andreaorcid-logoUCLouvain
    Author
  • Hollar, JonathanUCLouvain
    Author
  • Jafari, AbidehUCLouvain
    Author
  • Jez, PavelUCLouvain
    Author
  • Komm, MatthiasUCLouvain
    Author
  • Lemaitre, VincentUCLouvain
    Author
  • Nuttens, ClaudeUCLouvain
    Author
  • Pagano, DavideUCLouvain
    Author
  • Perrini, LuciaUCLouvain
    Author
  • Pin, ArnaudUCLouvain
    Author
  • Piotrzkowski, KrzysztofUCLouvain
    Author
  • Popov, AndreyUCLouvain
    Author
  • Quertenmont, LoïcUCLouvain
    Author
  • Selvaggi, MicheleUCLouvain
    Author
  • Vidal Maroño, MiguelUCLouvain
    Author
  • Vizan Garcia, Jesús ManuelUCLouvain
    Author
  • Bethani, Agniorcid-logoUCLouvain
    Author
  • et. al.
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Abstract
The ratio of the production cross sections times branching fractions (sigma(Bc+) B(Bc+ to J/psi pi+))/ (sigma(B+) B(B+ to J/psi K+)) 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 abs(y) < 1.6. The data sample corresponds to an integrated luminosity of 5.1 inverse femtobarns. The ratio is determined to be [0.48 +/- 0.05 (stat) +/- 0.03 (syst) +/- 0.05 (tau_{Bc})]% The J/psi pi+/- pi+/- pi-/+ decay mode 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(Bc+/- to J/psi pi+/- pi+/- pi-/+) / B(Bc+/- to J/psi pi+/-) is measured to be 2.55 +/- 0.80 (stat) +/- 0.33 (syst) +0.04/-0.01 (tau[Bc+]), consistent with the previous LHCb result.
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CMS, Basegmez, S., Beluffi, C., Bruno, G., Castello, R., Caudron, A., Ceard, L., Da Silveira, G. G., Delaere, C., Du Pree, T., Favart, D., Forthomme, L., Giammanco, A., Hollar, J., Jafari, A., Jez, P., Komm, M., Lemaitre, V., Nuttens, C., et al. (2015). Measurement of the ratio of the production cross sections times branching fractions of Bc+/- to J/psi pi+/- and B+/- to J/psi K+/- and B(Bc+/- to J/psi pi+/- pi+/- pi-/+)/B(Bc+/- to J/psi pi+/-) in pp collisions at sqrt(s) = 7 TeV. Journal of High Energy Physics, 1501, 63. https://doi.org/10.1007/JHEP01(2015)063 (Original work published 2015)