Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara
| Summary:
We report measurements of the branching fractions and direct $it{CP}$
asymmetries of the decays $B^0 to K^+ pi^-$, $B^+ to K^+ pi^0$, $B^+ to
K^0 pi^+$, and $B^0 to K^0 pi^0$, and use these for testing the standard
model through an isospin-based sum rule. In addition, we measure the branching
fraction and direct $it{CP}$ asymmetry of the decay $B^+ to pi^+pi^0$ and
the branching fraction of the decay $B^0 to pi^+pi^-$. The data are
collected with the Belle II detector from $e^+e^-$ collisions at the
$Upsilon(4S)$ resonance produced by the SuperKEKB asymmetric-energy collider
and contain $387times 10^6$ bottom-antibottom meson pairs. Signal yields are
determined in two-dimensional fits to background-discriminating variables, and
range from 500 to 3900 decays, depending on the channel. We obtain $-0.03 pm
0.13 pm 0.04$ for the sum rule, in agreement with the standard model
expectation of zero and with a precision comparable to the best existing
determinations.
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