Evidence for B+→hcK+ and observation of ηc(2S)→pp¯π+π−
Department
Physics
Document Type
Article
Publication Date
7-1-2019
Abstract
A search for the decays Bþ → hcKþ and B0 → hcK0 S is performed. Evidence for the decay Bþ → hcKþ is found; its significance is 4.8σ. No evidence is found for B0 → hcK0 S. The branching fraction for Bþ → hcKþ is measured to be ð3.7þ1.0 −0.9 þ0.8 −0.8 Þ × 10−5; the upper limit for the B0 → hcK0 S branching fraction is 1.4 × 10−5 at 90% C.L. In addition, a study of the pp¯ πþπ− invariant mass distribution in the channel Bþ → ðpp¯ πþπ−ÞKþ results in the first observation of the decay ηcð2SÞ → pp¯ πþπ− with 12.1σ significance. The analysis is based on the 711 fb−1 data sample collected by the Belle detector at the asymmetric-energy eþe− collider KEKB at the ϒð4SÞ resonance.
Journal Title
Physical Review D
Journal ISSN
2470-0010,2470-0029
Volume
100
Digital Object Identifier (DOI)
10.1103/PhysRevD.100.012001
Comments
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 .