000002171 001__ 2171
000002171 005__ 20201231043034.0
000002171 037__ $$aBELLE2-CONF-PROC-2020-019
000002171 041__ $$aeng
000002171 100__ $$aYun-Tsung Lai
000002171 245__ $$aUpdates in Charmless B-Meson Decays at Belle II
000002171 260__ $$a$$c2020-12-02
000002171 300__ $$amult. p
000002171 520__ $$aWe report on first measurement of branching fractions ($\mathcal{B}$) and $CP$ asymmetries ($\mathcal{A}$) in various charmless $B$ decays at Belle II. We utilize a data sample of 34.6 fb$^{-1}$ which is collected in SuperKEKB $e^{+}e^{-}$ collider at the $\Upsilon$(4S) resonance in 2019 and 2020. The analysis procedures, including the Monte Carlo (MC) simulation study, background reduction, and physics observable measurements, will be described in detail in this report. Polarization fraction of $B\to\phi K^{*}$ modes is also measured. All these results in charmless $B$ decays from Belle II are consistent with world average and are good validations on the detector systems and analysis strategies. Belle II is ready for more new physics search with larger data set in near future in all aspects.
000002171 8560_ $$fyun-tsung.lai@desy.de
000002171 8564_ $$uhttps://docs.belle2.org/record/2171/files/BELLE2-CONF-PROC-2020-019.pdf$$zUpdated version by Diego's comments.