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Study of B-+/--> J/psi pi(+/-) and B-+/--> J/psi K +/- decays: Measurement of the ratio of branching fractions and search for direct CP violation

Aubert, B; Barate, R; Boutigny, D; Couderc, F; Gaillard, JM; Hicheur, A; Karyotakis, Y; ... BABAR Collaboration; + view all (2004) Study of B-+/--> J/psi pi(+/-) and B-+/--> J/psi K +/- decays: Measurement of the ratio of branching fractions and search for direct CP violation. PHYS REV LETT , 92 (24) , Article 241802. 10.1103/PhysRevLett.92.241802. Green open access

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Abstract

We study B+/--->J/psipi(+/-) and B+/--->J/psiK(+/-) decays in a sample of about 89x10(6) B (B) over bar pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We observe a signal of 244+/-20 B+/--->J/psipi(+/-) events and determine the ratio B(B+/--->J/psipi(+/-))/B(B+/--->J/psiK(+/-)) to be [5.37+/-0.45(stat)+/-0.11(syst)]%. The charge asymmetries for the B+/--->J/psipi(+/-) and B+/--->J/psiK(+/-) decays are determined to be A(pi)=0.123+/-0.085(stat)+/-0.004(syst) and A(K)=0.030+/-0.015(stat)+/-0.006(syst), respectively.

Type: Article
Title: Study of B-+/--> J/psi pi(+/-) and B-+/--> J/psi K +/- decays: Measurement of the ratio of branching fractions and search for direct CP violation
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.92.241802
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.92.241802
Language: English
Additional information: The American Physical Society
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1303662
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