Observation of radiative B -> phi K gamma decays
A Drutskoy, K Abe, K Abe, T Abe, H Aihara, M Akatsu, Y Asano, V Aulchenko, T Aushev, AM Bakich, Y Ban, A Bay, I Bedny, PK Behera, I Bizjak, A Bondar, A Bozek, M Bracko, TE Browder, BCK Casey Show all
PHYSICAL REVIEW LETTERS | AMERICAN PHYSICAL SOC | Published : 2004
The radiative decay B-->phi K gamma is observed for the first time. The branching fraction for the charged B--->phi K- gamma decay mode is measured to be B(B--->phi K- gamma)=(3.4+/-0.9+/-0.4)x10(-6). The photon energy distribution for the B--->phi K- gamma decay is presented. The signal for the neutral B(0)-->phi K(0)gamma decay mode is not statistically significant and an upper limit, B(B(0)-->phi K(0)gamma)<8.3x10(-6) at 90% C.L., is set. The analysis is based on a data set of 90 fb(-1) collected by the Belle experiment at the e(+)e(-) asymmetric collider KEKB.