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

J. P. Lees et al. (BaBar Collaboration)
Phys. Rev. Lett. 124, 152001 – Published 16 April 2020
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Abstract

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 424fb1. 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)]×104 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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  • Received 29 November 2019
  • Revised 22 January 2020
  • Accepted 20 March 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.152001

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

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Vol. 124, Iss. 15 — 17 April 2020

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