Exclusive Radiative B meson decays at Belle

TL;DR

This paper reports on measurements of exclusive radiative B meson decays at Belle, testing for new physics effects and presenting the first observation of B^0->K^0 decay with high significance.

Contribution

It provides new measurements of CP violation parameters and reports the first observation of a rare radiative decay, enhancing understanding of B meson decay processes and potential new physics.

Findings

Measurements consistent with Standard Model predictions

First observation of B^0->K^0 decay with 5.4 sigma significance

Constraints on right-handed currents from decay analysis

Abstract

In this proceeding, we discuss recent results on exclusive radiative B meson decays from the Belle Collaboration. These decays are sensitive to right-handed currents from New Physics. In particular, we measure time-dependent CP violation parameters in B^0->K_S\pi^0\gamma and B^0->K_S\rho^0\gamma decays, using high-statistics data samples collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e^+e^- collider. With the present statistics, these measurements are consistent with the standard model predictions. We also search for the radiative decay B^0->\phiK^0\gamma and report the first observation with a significance of 5.4 \sigma, including systematic uncertainties.