Measurement of the inclusive $B\to X_{s+d}\gamma$ branching fraction, photon energy spectrum and HQE parameters

Abstract

We report a measurement of the inclusive $B\to X_{s+d}\gamma$ and $B\to X_s\gamma$ branching fractions using a data set of $(772\pm 11)\times 10^6$ $B\bar{B}$ pairs collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. Results are presented for photon energy thresholds between 1.7 to 2.0 GeV. For the 1.8 GeV threshold we find ${\mathcal{B}}_{s\gamma }=(3.01\pm 0.10\text{(stat)}\pm 0.18\text{(syst)}\pm 0.08\text{(model)})\times 10^{-4}$. The Heavy Quark Expansion parameters that best fit the spectrum in the shape-function scheme are $m_b=(4.626\pm 0.028)\text{GeV}$ and ${\mu }_{\pi }^2=(0.301\pm 0.063){\text{GeV}}^2$.

arXiv commentBELLE-CONF-1606. Conference paper for ICHEP 2016

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