Observation of $B^0 \to D_s^+ \pi^-$

TL;DR

This paper reports the first observation of the decay $B^0 o D_s^+ \pi^-$ and provides improved measurements of related decay branching fractions using a large dataset from the Belle detector.

Contribution

The study presents the first observation of a rare B meson decay and refines measurements of related decay modes, enhancing understanding of B meson decay processes.

Findings

First observation of $B^0 o D_s^+ \pi^-$ decay.

Measured branching fractions with improved precision.

Provides data for testing theoretical models of B decays.

Abstract

We report the first observation of $B^0 \to D_s^+ \pi^-$ and an improved measurement of ${\bar B^0} \to D_s^+K^-$ based on $274 \times 10^6$ $B{\bar B}$ events collected with the Belle detector at KEKB. We measure the branching fractions ${\cal B}({\bar B^0} \to D_s^+K^-) = (2.93 \pm 0.55 \pm 0.79) \times 10^{-5}$ and ${\cal B}(B^0 \to D_s^+ \pi^-) = (1.94 \pm 0.47 \pm 0.52) \times 10^{-5}$.