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

Lees, J P

Physical review letters, 2020-04, Vol.124 (15) [Periódico revisado por pares]

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Título:
Measurements of the Absolute Branching Fractions of B±→K±Xcc
Autor: Lees, J P
Assuntos: Decay ; particle decays ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; quantum chromodynamics ; quantum field theory ; quark model
É parte de: Physical review letters, 2020-04, Vol.124 (15)
Notas: SLAC-PUB-17489
USDOE Office of Science (SC)
National Science Foundation (NSF)
AC02-05CH11231; AC02-76SF00515
Descrição: A study of the two-body decays B±→Xcc¯K±, 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.
Editor: College Park: American Physical Society
Idioma: Inglês

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