First Observation of the Decay B0->psi(2S)pi0

TL;DR

This paper reports the first observation of the decay B0 to psi(2S) pi0, measuring its branching fraction with high significance using a large data set from the Belle experiment.

Contribution

The study provides the first experimental evidence of the B0 to psi(2S) pi0 decay, expanding understanding of B meson decay modes.

Findings

Branching fraction measured as (1.17 ± 0.17 (stat) ± 0.08 (syst)) × 10^{-5}

Decay observed with a significance of 7.2 standard deviations

First observation of this decay mode

Abstract

We report a measurement of the $B^0\rightarrow\psi(2S)\pi^0$ branching fraction based on the full $\Upsilon(4S)$ data set of $772\times10^{6}$ $B\bar{B}$ pairs collected by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We obtain $B(B^0\rightarrow\psi(2S)\pi^0) = (1.17\pm0.17\text{(stat)}\pm0.08\text{(syst)})\times10^{-5}$. The result has a significance of 7.2 standard deviations and is the first observation of the decay $B^0\rightarrow\psi(2S)\pi^0$.