Inclusive $B$ decays and exclusive radiative decays by Belle

TL;DR

This paper reports on measurements of rare B meson decays involving photons and leptons, providing insights into potential new physics beyond the Standard Model using data from the Belle experiment.

Contribution

First measurement of branching fractions and asymmetries in rare B decays using the Belle detector with a large data sample.

Findings

Branching fraction of A0X_s A0γ measured.

CP asymmetry in A0X_{s+d} A0γ analyzed.

Forward-backward asymmetry in A0X_s A0A0ℓ^+ A0ℓ^- studied.

Abstract

The $b \rightarrow s \gamma$, $b \rightarrow d \gamma$ and $b \rightarrow s \ell^+ \ell^-$ processes are allowed at higher order via the electroweak loop or box diagrams in the Standard model. It is sensitive probe to search for new physics beyond the Standard model because new particles might enter in the loop. We present preliminary results of branching fraction of the $\bar{B} \rightarrow X_s \gamma$, $CP$ asymmetry in the $\bar{B} \rightarrow X_{s+d} \gamma$, and the forward-backward asymmetry in the $\bar{B} \rightarrow X_s \ell^+ \ell^-$. The results are based on a data sample containing $772 \times 10^6 B\bar{B}$ pairs recorded at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ collider.