The decay of B+ → ωl+ν (l = e or μ) in 78 fb-1 of υ(4S) data accumulated with the Belle detector is discussed. To estimate the neutrino momentum, the final state is fully reconstructed using the ω decay into π+π -π0, combined with detector hermeticity. It is found that corresponding to a branching fraction of (1.3±0.4±0.2±0.3) × 10-4, a signal of 414±125 events is found in the data, where the first two errors are systematic and statistical, respectively. The estimated form-factor uncertainty is reflected from the third error.
Bibliographical noteFunding Information:
We thank the KEKB group for the excellent operation of the accelerator, the KEK Cryogenics group for the efficient operation of the solenoid, and the KEK computer group and the NII for valuable computing and Super-SINET network support. We acknowledge support from MEXT and JSPS (Japan); ARC and DEST (Australia); NSFC (Contract No. 10175071, China); DST (India); the BK21 program of MOEHRD and the CHEP SRC program of KOSEF (Korea); KBN (Contract No. 2P03B 01324, Poland); MIST (Russia); MESS (Slovenia); NSC and MOE (Taiwan); and DOE (USA).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)