000003427 001__ 3427
000003427 005__ 20230227082039.0
000003427 037__ $$aBELLE2-CONF-PH-2022-018
000003427 041__ $$aeng
000003427 088__ $$aBELLE2-CONF-DRAFT-2022-018
000003427 100__ $$aHenrikas Svidras
000003427 245__ $$aMeasurement of the photon-energy spectrum in inclusive B-> X_s gamma decays identified using hadronic decays of the recoil B meson in 2019–2021 Belle II data
000003427 260__ $$a$$c2022-10-20
000003427 300__ $$a14
000003427 520__ $$aWe measure the photon-energy spectrum in radiative bottom-meson ($B$) decays into inclusive final states involving a strange hadron and a photon. We use SuperKEKB electron-positron collisions corresponding to $189$/fb of integrated luminosity collected at the $\Upsilon(4S)$ resonance by the Belle II experiment. The partner $B$ candidates are fully reconstructed using a large number of hadronic channels. The $B\rightarrow X_s \gamma$ partial branching fractions are measured as a function of photon energy in the signal $B$ meson rest frame in eight bins above 1.8 GeV. The background-subtracted signal yield for this photon energy region is $343 \pm 122$ events. Integrated branching fractions for three photon energy thresholds of $1.8$~GeV, $2.0$~GeV, and $2.1$~GeV are also reported, and found to be in agreement with world averages.
000003427 6531_ $$aphoton
000003427 6531_ $$apenguin
000003427 6531_ $$aradiative
000003427 6531_ $$aewp
000003427 6531_ $$aelectroweak
000003427 6531_ $$aspectrum
000003427 6531_ $$abtosgamma
000003427 6531_ $$absgamma
000003427 6531_ $$agamma
000003427 6531_ $$aphotons
000003427 6531_ $$axs
000003427 6531_ $$ahadronic tagged
000003427 6531_ $$afei tagged
000003427 700__ $$aArthur Bolz
000003427 700__ $$aLu Cao
000003427 700__ $$aMarkus Röhrken
000003427 700__ $$aKerstin Tackmann
000003427 8560_ $$fhenrikas.svidras@desy.de
000003427 8564_ $$uhttps://docs.belle2.org/record/3427/files/BELLE2-CONF-PH-2022-018.pdf
000003427 8564_ $$uhttps://docs.belle2.org/record/3427/files/Approved%20plots%20and%20numbers.pdf$$yApproved plots and numbers