Improved Measurement of Inclusive Radiative B-meson decays

Abstract

We report a fully inclusive measurement of the flavor changing neutral current decay $B\to X_s\gamma$ in the energy range $1.7 \GeV\le E^\mathrm{c.m.s}_γ\le 2.8 \GeV$, covering 97% of the total spectrum, where c.m.s is the center of mass system. Using $605\ifb$ of data, we obtain in the rest frame of the $B$-meson $\mathcal{B}(B\to X_s\gamma :E_{\gamma }^B>1.7\mathrm{GeV})=(3.31\pm 0.19\pm 0.37\pm 0.01)\times 10^{-4}$, where the errors are statistical, systematic and from the boost correction needed to transform from the rest frame of the ${\rm Y}(4S)$ (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.

10 pages, 11 figures

Cited by in corpus (13)

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• QCD Calculations of Radiative B Decays
• Search for TeV Scale Physics in Heavy Flavour Decays
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• Beauty and charm results from $B$-factories
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