Evidence of hb(2P)→(1S)η Decay and Search for hb(1P,2P)→(1S)π0 with the Belle Detector
Journal
Physical Review Letters
Journal Volume
133
Journal Issue
26
Start Page
261901
ISSN
0031-9007
1079-7114
Date Issued
2024-12-24
Author(s)
Abstract
We report the first evidence for the h_{b}(2P)→ϒ(1S)η transition with a significance of 3.5 standard deviations. The decay branching fraction is measured to be B[h_{b}(2P)→ϒ(1S)η]=(7.1_{-3.2}^{+3.7}±0.8)×10^{-3}, which is noticeably smaller than expected. We also set upper limits on π^{0} transitions of B[h_{b}(2P)→ϒ(1S)π^{0}]<1.8×10^{-3}, and B[h_{b}(1P)→ϒ(1S)π^{0}]<1.8×10^{-3}, at the 90% confidence level. These results are obtained with a 131.4 fb^{-1} data sample collected near the ϒ(5S) resonance with the Belle detector at the KEKB asymmetric-energy e^{+}e^{-} collider.
Publisher
American Physical Society (APS)
Type
journal article