Observation of B+ --> K1(1270)+ gamma
High Energy Physics - Experiment
2019-08-14 v2
Abstract
We report the observation of the radiative decay B+ --> K1(1270)+ gamma using a data sample of 140 fb-1 taken at the Upsilon(4S) resonance with the Belle detector at the KEKB e+e- collider. We find the branching fraction to be Br(B+ --> K1(1270)+ gamma) = (4.3 +- 0.9(stat.) +- 0.9(syst.)) x 10-5 with a statistical significance of 7.3sigma. We find no significant signal for B+ --> K1(1400)+ gamma and set an upper limit Br(B+ --> K1(1400)+ gamma) < 1.5 x 10-5 at the 90% confidence level. We also measure inclusive branching fractions for B+ --> K+ pi+ pi- gamma and B0 --> K0 pi+ pi- gamma in the mass range 1 GeV/c^2 < M(K+(0)pi+pi-) < 2 GeV/c^2.
Cite
@article{arxiv.hep-ex/0412039,
title = {Observation of B+ --> K1(1270)+ gamma},
author = {Heyoung Yang},
journal= {arXiv preprint arXiv:hep-ex/0412039},
year = {2019}
}
Comments
6 pages, 2 figures, 1 table, Published in Phys.Rev.Lett