Measurements of the Absolute Branching Fractions of B±→K±Xcc¯

General Physics :Kjerne- og elementærpartikkelfysikk: 431 [VDP] BABAR BaBar; PEP-II; B meson; Bottom mesons; B decays; charmonium physics; inclusive measurements B meson Hadrons 530 PARTICLE PHYSICS; PEP2; BABAR 01 natural sciences Mathematical Sciences DECAYS Atomic physics Engineering 0103 physical sciences PEP2 Fraccions Baryons Fractions Barions Elementary particles; Absolute branching fractions; Charmonium; Two-body decays; High energy physics; hep-ex Particle physics VDP::Kjerne- og elementærpartikkelfysikk: 431 HEP; BaBar Bottom meson B mesons; meson hadronic decay; X mesons BABAR Collaboration :Nuclear and elementary particle physics: 431 [VDP] VDP::Nuclear and elementary particle physics: 431 BaBar Collaboration Physical Sciences BaBar PEP-II PARTICLE PHYSICS babar; slac; branching ratio Física de partícules Experiments
DOI: 10.1103/physrevlett.124.152001 Publication Date: 2020-04-16T16:27:42Z
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ABSTRACT
A study of the two-body decays B^{±}→X_{cc[over ¯]}K^{±}, where X_{cc[over ¯]} 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.
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