Moments of the photon energy spectrum from B→ X_s γ decays measured by Belle

2005/07/31 by Belle Collaboration
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.48550/arxiv.hep-ex/0508005

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

arxiv created 2005/07/31 · openalex publication_date 2005/07/31 · arxiv updated 2012/08/27 · openalex created_date 2024/04/11 · openalex updated_date 2026/07/28

Abstract

We report preliminary measurements of the first (mean) and second moment (variance) of the inclusive photon energy spectrum in B→ X_sγ 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 BB pairs collected by the Belle detector at the KEKB asymmetric-energy electron-positron collider operated on the Υ(4S) resonance.

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