Conference Proceedings
Improved measurement of inclusive radiative B-meson decays
J Schümann, A Limosani
Aip Conference Proceedings | Published : 2008
DOI: 10.1063/1.3051954
Abstract
We report a fully inclusive measurement of the flavor changing neutral current decay B → Xsγ in the energy range 1.7 GeV ≤ Eγc.m.s.s ≤ 2.8 GeV, covering 97% of the total spectrum, where c.m.s is the center of mass system. Using 605fb-1 of data, we obtain in the rest frame of the B-meson ℬ(b → Xsγ : EγB > 1.7 GeV) = (3.31 ±0.19 ±0.37 ±0.01) × 10-4, where the errors are statistical, systematic and from the boost correction needed to transform from the rest frame of the Y(4S) (c.m.s) to that of the B-meson, respectively. We also measure the first and second moments of the photon energy spectrum as functions of various energy thresholds, which extend down to 1.7 GeV. The results are preliminary...
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Funding Acknowledgements
We thank the KEKB group for excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations, and the KEK computer group and the Nil for valuable computing and SINET3 network support. We acknowledge support from MEXT and JSPS (Japan); ARC, DEST and A.J. Slocum (Australia); NSFC (China); DST (India); MOEHRD, KOSEF and KRF (Korea); KBN (Poland); MES and RFAAE (Russia); ARRS (Slovenia); SNSF (Switzerland); NSC and MOE (Taiwan); and DOE (USA).