Recent Belle results from Y(5S) sample

TL;DR

This paper reports on Belle's recent results from Y(5S) data, including measurements of Bs0 decay branching fractions, the first observation of a baryonic Bs0 decay, and a new CKM angle measurement, advancing understanding of Bs meson properties.

Contribution

It presents new measurements of Bs0 decay modes, including the first baryonic decay observation and CKM angle determination, utilizing a large Y(5S) data sample.

Findings

Measurement of Bs0->J/psi f0(980) and f0(1370) branching fractions

First observation of baryonic Bs0 decay Bs0-bar->Lambda(c)+ pi- Lambda-bar

New measurement of CKM angle phi_1(beta) with B pi tagged events

Abstract

The large data sample recorded with the Belle detector at the Y(5S) energy provides a unique opportunity to study the poorly-known $\bs$ meson. Two analyses, performed with a data sample representing an integrated luminosity of 121 /fb, are presented: the measurement of the Bs0->J/psi f0(980) and Bs0->J/psi f0(1370) branching fractions, and the 5sigma observation of the decay Bs0-bar->Lambda(c)+ pi- Lambda-bar which is the first observation of a baryonic Bs0 decay. In addition, we present new results of a measurement of the CKM angle phi_1(beta) with B pi tagged events.