Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2009-07-08
Phys.Rev.Lett.103:241801,2009
Physics
High Energy Physics
High Energy Physics - Experiment
9 pages, 3 figures, 2 tables
Scientific paper
10.1103/PhysRevLett.103.241801
Using 605/fb of data collected at the Upsilon(4S) resonance we present a measurement of the inclusive radiative B-meson decay channel, B to X_s gamma. For the lower photon energy thresholds of 1.7, 1.8, 1.9 and 2.0GeV, as defined in the rest frame of the B-meson, we measure the partial branching fraction and the mean and variance of the photon energy spectrum. At the 1.7GeV threshold we obtain the partial branching fraction BF(B to X_s gamma) = (3.45 +/- 0.15 +/- 0.40) x 10^-4, where the errors are statistical and systematic.
for the Belle Collaboration
Limosani A.
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