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

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...

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Bibliographic Details
Published in:	Physical review letters Vol. 124; no. 15
Main Author:	Lees, J P
Format:	Journal Article
Language:	English
Published:	College Park American Physical Society 17-04-2020 American Physical Society (APS)
Subjects:	Decay particle decays PHYSICS OF ELEMENTARY PARTICLES AND FIELDS quantum chromodynamics quantum field theory quark model
Online Access:	Get full text
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Summary:	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.
Bibliography:	SLAC-PUB-17489 USDOE Office of Science (SC) National Science Foundation (NSF) AC02-05CH11231; AC02-76SF00515
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.124.152001