Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2008-03-14
Phys.Rev.D78:032016,2008
Physics
High Energy Physics
High Energy Physics - Experiment
19 pages, 9 figures, 12 tables
Scientific paper
10.1103/PhysRevD.78.032016
Using the previous Belle measurement of the inclusive photon energy in $B\to X_s\gamma$ decays, we determine the first and second moments of this spectrum for minimum photon energies in the $B$ meson rest frame ranging from 1.8 to 2.3 GeV. Combining these measurements with recent Belle data on the lepton energy and hadronic mass moments in $B\to X_c\ell\nu$ decays, we perform fits to theoretical expressions derived in the 1S and kinetic mass schemes and extract the magnitude of the Cabibbo-Kobayashi-Maskawa (CKM) matrix element $V_{cb}$, the $b$-quark mass and other non-perturbative parameters. In the 1S scheme analysis we find $|V_{cb}|=(41.56\pm 0.68(\mathrm{fit})\pm 0.08(\tau_B))\times 10^{-3}$ and $m_b^\mathrm{1S}=(4.723\pm 0.055)$ GeV. In the kinetic scheme, we obtain $|V_{cb}|=(41.58\pm 0.69(\mathrm{fit})\pm 0.08(\tau_B)\pm 0.58(\mathrm{th}))\times 10^{-3}$ and $m_b^\mathrm{kin}=(4.543\pm 0.075)$ GeV.
Barberio Elisabetta
Belle Collaboration
Limosani A.
Schwanda Christoph
Urquijo Phillip
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