Title
Measurement of the ratio of the production cross sections times branching fractions of <tex>$B_{c}^{\pm}\rightarrow J/\psi\pi^{\pm}$</tex> and <tex>$B^{\pm}\rightarrow J/\psi K^{\pm}$</tex> and <tex>$B(B_{c}^{\pm}\rightarrow J/\psi\pi^{\pm}\pi^{\pm}\pi^{\mp})/B(B_{c}^{\pm}\rightarrow J/\psi\pi^{\pm})$</tex> in pp collisions at <tex>$\sqrt{s}$</tex>=7 Tev Measurement of the ratio of the production cross sections times branching fractions of <tex>$B_{c}^{\pm}\rightarrow J/\psi\pi^{\pm}$</tex> and <tex>$B^{\pm}\rightarrow J/\psi K^{\pm}$</tex> and <tex>$B(B_{c}^{\pm}\rightarrow J/\psi\pi^{\pm}\pi^{\pm}\pi^{\mp})/B(B_{c}^{\pm}\rightarrow J/\psi\pi^{\pm})$</tex> in pp collisions at <tex>$\sqrt{s}$</tex>=7 Tev
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Bristol ,
Subject
Physics
Source (journal)
Journal of high energy physics. - Bristol
Volume/pages
(2015) :1 , 30 p.
ISSN
1126-6708
1029-8479
1029-8479
Article Reference
063
Carrier
E-only publicatie
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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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Full text (open access)
https://repository.uantwerpen.be/docman/irua/e81bee/129498.pdf
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