Measurement of the photon-energy spectrum in inclusive B-> X_s gamma decays identified using hadronic decays of the recoil B meson in 2019–2021 Belle II data

Sumitted to PubDB: 2023-02-27

Category: Conference papers and plots, Visibility: Public

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Authors Arthur Bolz, Lu Cao, Markus Röhrken, Henrikas Svidras, Kerstin Tackmann
Date Oct. 20, 2022
Belle II Number BELLE2-CONF-PH-2022-018
Abstract We measure the photon-energy spectrum in radiative bottom-meson (B) decays into inclusive final states involving a strange hadron and a photon. We use SuperKEKB electron-positron collisions corresponding to 189/fb of integrated luminosity collected at the Υ(4S) resonance by the Belle II experiment. The partner B candidates are fully reconstructed using a large number of hadronic channels. The BXsγ partial branching fractions are measured as a function of photon energy in the signal B meson rest frame in eight bins above 1.8 GeV. The background-subtracted signal yield for this photon energy region is 343±122 events. Integrated branching fractions for three photon energy thresholds of 1.8~GeV, 2.0~GeV, and 2.1~GeV are also reported, and found to be in agreement with world averages.

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