First measurements of absolute branching fractions of the Ξc+ baryon at Belle
Journal
Physical Review D
Journal Volume
100
Journal Issue
3
Date Issued
2019
Author(s)
Y. B. Li et al. (Belle Collaboration)
Abstract
We present the first measurements of the absolute branching fractions of Ξc+ decays into Ξ-π+π+ and pK-π+ final states. Our analysis is based on a data set of (772±11)×106 BB? pairs collected at the (4S) resonance with the Belle detector at the KEKB e+e- collider. We measure the absolute branching fraction of B?0→Λ?c-Ξc+ with the Ξc+ recoiling against Λ?c- in B?0 decays resulting in B(B?0→Λ?c-Ξc+)=[1.16±0.42(stat.)±0.15(syst.)]×10-3. We then measure the product branching fractions B(B?0→Λ?c-Ξc+)B(Ξc+→Ξ-π+π+) and B(B?0→Λ?c-Ξc+)B(Ξc+→pK-π+). Dividing these product branching fractions by B?0→Λ?c-Ξc+ yields B(Ξc+→Ξ-π+π+)=[2.86±1.21(stat.)±0.38(syst.)]% and B(Ξc+→pK-π+)=[0.45±0.21(stat.)±0.07(syst.)]%. Our result for B(Ξc+→Ξ-π+π+) can be combined with Ξc+ branching fractions measured relative to Ξc+→Ξ-π+π+ to set the absolute scale for many Ξc+ branching fractions. ? 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/ 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.
Type
journal article