A study of the two-body decays B±→XccK±, where Xcc refers to one charmonium state, is reported by the BABAR Collaboration using a data sample of 424 fb-1. The absolute determination of branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found for the decay B+→X(3872)K+ at the 3σ level. The absolute branching fraction B[B+→X(3872)K+]=[2.1±0.6(stat)±0.3(syst)]×10-4 is measured for the first time. It follows that B[X(3872)→J/ψπ+π-]=(4.1±1.3)%, supporting the hypothesis of a molecular component for this resonance.

Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2020). Measurements of the Absolute Branching Fractions of B± →k±Xc c. PHYSICAL REVIEW LETTERS, 124(15) [10.1103/PhysRevLett.124.152001].

Measurements of the Absolute Branching Fractions of B± →k±Xc c

Carpinelli M.;
2020

Abstract

A study of the two-body decays B±→XccK±, where Xcc refers to one charmonium state, is reported by the BABAR Collaboration using a data sample of 424 fb-1. The absolute determination of branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found for the decay B+→X(3872)K+ at the 3σ level. The absolute branching fraction B[B+→X(3872)K+]=[2.1±0.6(stat)±0.3(syst)]×10-4 is measured for the first time. It follows that B[X(3872)→J/ψπ+π-]=(4.1±1.3)%, supporting the hypothesis of a molecular component for this resonance.
Articolo in rivista - Articolo scientifico
Atomic physics
English
2020
124
15
152001
none
Lees, J., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., et al. (2020). Measurements of the Absolute Branching Fractions of B± →k±Xc c. PHYSICAL REVIEW LETTERS, 124(15) [10.1103/PhysRevLett.124.152001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/471621
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