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Measurement of the photon-energy spectrum in inclusive B→Xsγ decays identified using hadronic decays of the recoil B meson in 2019-2021 Belle II data

MPS-Authors

Andricek,  L.
Max Planck Semiconductor Laboratory, Max Planck Society;

Ninkovic,  J.
Max Planck Semiconductor Laboratory, Max Planck Society;

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2210.10220.zip
(Preprint), 416KB

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Citation

Belle II Collaboration, Abudinén, F., Adachi, I., Adamczyk, K., Aggarwal, L., Ahlburg, P., et al. (in preparation). Measurement of the photon-energy spectrum in inclusive B→Xsγ decays identified using hadronic decays of the recoil B meson in 2019-2021 Belle II data.


Cite as: https://hdl.handle.net/21.11116/0000-000F-AFEE-1
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 $189~\mathrm{fb}^{-1}$
of integrated luminosity collected at the $\Upsilon(4S)$ resonance by the Belle
II experiment. The partner $B$ candidates are fully reconstructed using a large
number of hadronic channels. The $B \rightarrow X_s \gamma$ partial branching
fractions are measured as a function of photon energy in the signal $B$ meson
rest frame in eight bins above $1.8~\mathrm{GeV}$. The background-subtracted
signal yield for this photon energy region is $343 \pm 122$ events. Integrated
branching fractions for three photon energy thresholds of $1.8~\mathrm{GeV}$,
$2.0~\mathrm{GeV}$, and $2.1~\mathrm{GeV}$ are also reported, and found to be
in agreement with world averages.