0000000001139299

AUTHOR

Lepeltier

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

2020

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.

PhysicsParticle physics:Kjerne- og elementærpartikkelfysikk: 431 [VDP]Meson010308 nuclear & particles physicsElectron–positron annihilationGeneral Physics and AstronomyBaBar experimentBottom mesonBaBar; PEP-II; B meson; Bottom mesons;Bottom mesonsB mesonBranching (polymer chemistry)7. Clean energy01 natural sciencesLower limitHEPNO:Nuclear and elementary particle physics: 431 [VDP]0103 physical sciencesBaBarPEP-IIB meson010306 general physicsBar (unit)
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