Bs0 Decays at Belle

TL;DR

This paper reports on various decay modes of the Bs0 meson studied with the Belle detector, including first observations of some decay channels and measurements related to CP violation and decay widths.

Contribution

It presents new measurements and first observations of specific Bs0 decay modes using a large data sample from Belle at the Y(5S) energy.

Findings

First observation of Bs0 -> Ds*- pi+ decay

Measurement of B(Bs0 -> J/psi f0(980))<1.63x10^-4 at 90% C.L.

Extraction of Delta(Gamma_s)/Gamma_s from Bs0 decay modes

Abstract

The large data sample recorded with the Belle detector at the Y(5S) energy provides a unique opportunity to study the poorly-known Bs0 meson. Several analyses, made with a data sample representing an integrated luminosity of 23.6 /fb, are presented. We report the study of the large-signal Bs0 -> Ds(*)- h+ (h+ = pi+ or rho+) decays including the first observations of Bs0 -> Ds*- pi+ and Bs0 -> Ds(*)- rho+. In addition, several results on CP-eigenstate Bs0 decays are described. These include the study of the Bs0 -> J/psi eta(') and Bs0 -> J/psi f0(980) decays, the charmless Bs0 -> K+ K-, Bs0 -> pi+ pi pi- and Bs0 -> Kshort Kshort decays and the simultaneous fit of the three Bs0 -> Ds(*)Ds(*) modes from which Delta(Gamma_s)/Gamma_s is extracted. The preliminary measurement of B(Bs0 -> J/psi f0(980))<1.63x10^-4 (at 90% C.L.) is presented for the first time.