Moments of the photon energy spectrum from $B\to X_s γ$ decays measured by Belle

Details Moments of the photon energy spectrum from $B\to X_s γ$ decays measured by Belle Moments of the photon energy spectrum from $B\to X_s γ$ decays measured by Belle

2005-07-31

arxiv.org/abs/hep-ex/0508005v1

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages, 3 figures, 4 tables, contributed to HEP2005 International Europhysics Conference on High Energy Physics

Scientific paper

We report preliminary measurements of the first (mean) and second moment (variance) of the inclusive photon energy spectrum in $B\to X_s\gamma$ decays, for threshold values of the photon energy in the range 1.8--2.3 GeV as measured in the rest frame of the $B$-meson. These results are obtained from the Belle measurement of the spectrum, which used a data set consisting of 152 million $B\bar{B}$ pairs collected by the Belle detector at the KEKB asymmetric-energy electron-positron collider operated on the $\Upsilon(4S)$ resonance.

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