Study of B± → J/ψπ± and B± → J/ψK± decays: measurement of the ratio of branching fractions and search for direct CP violation

B Aubert; Theresa Harrison; Kelly Ford; Christopher Hawkes; Sian Morgan; Alan Watson; Nigel Watson

doi:10.1103/PhysRevLett.92.241802

Study of B± → J/ψπ± and B± → J/ψK± decays: measurement of the ratio of branching fractions and search for direct CP violation

B Aubert, Theresa Harrison, Kelly Ford, Christopher Hawkes, Sian Morgan, Alan Watson, Nigel Watson

Physics and Astronomy

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Abstract

We study B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- decays in a sample of about 89 x 10(6) BB pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We observe a signal of 244+/-20 B+/ --> J/psi pi(+/-) events and determine the ratio B(B+/ --> J/psi pi(+/-))/B(B+/ --> J/psi K+/-) to be [5.37+/-0.45(stat)+/-0.11(syst)]%. The charge asymmetries for the B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- 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.

Original language	English
Pages (from-to)	241802
Number of pages	1
Journal	Physical Review Letters
Volume	92
Issue number	24
Early online date	1 Jun 2004
DOIs	https://doi.org/10.1103/PhysRevLett.92.241802
Publication status	Published - 1 Jun 2004

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title = "Study of B± → J/ψπ± and B± → J/ψK± decays: measurement of the ratio of branching fractions and search for direct CP violation",

abstract = "We study B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- decays in a sample of about 89 x 10(6) BB pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We observe a signal of 244+/-20 B+/ --> J/psi pi(+/-) events and determine the ratio B(B+/ --> J/psi pi(+/-))/B(B+/ --> J/psi K+/-) to be [5.37+/-0.45(stat)+/-0.11(syst)]%. The charge asymmetries for the B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- 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.",

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T1 - Study of B± → J/ψπ± and B± → J/ψK± decays: measurement of the ratio of branching fractions and search for direct CP violation

AU - Aubert, B

AU - Harrison, Theresa

AU - Ford, Kelly

AU - Hawkes, Christopher

AU - Morgan, Sian

AU - Watson, Alan

AU - Watson, Nigel

PY - 2004/6/1

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N2 - We study B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- decays in a sample of about 89 x 10(6) BB pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We observe a signal of 244+/-20 B+/ --> J/psi pi(+/-) events and determine the ratio B(B+/ --> J/psi pi(+/-))/B(B+/ --> J/psi K+/-) to be [5.37+/-0.45(stat)+/-0.11(syst)]%. The charge asymmetries for the B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- 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.

AB - We study B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- decays in a sample of about 89 x 10(6) BB pairs collected with the BABAR detector at the PEP-II asymmetric B factory at SLAC. We observe a signal of 244+/-20 B+/ --> J/psi pi(+/-) events and determine the ratio B(B+/ --> J/psi pi(+/-))/B(B+/ --> J/psi K+/-) to be [5.37+/-0.45(stat)+/-0.11(syst)]%. The charge asymmetries for the B+/ --> J/psi pi(+/-) and B+/ --> J/psi K+/- 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.

U2 - 10.1103/PhysRevLett.92.241802

DO - 10.1103/PhysRevLett.92.241802

M3 - Article

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SN - 1079-7114

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 24

ER -

Study of B± → J/ψπ± and B± → J/ψK± decays: measurement of the ratio of branching fractions and search for direct CP violation

Abstract

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