Observation of Bs to Psi(2S)phi and Measurement of Ratio of Branching Fractions B (Bs --> Psi(2S)phi) / B (Bs --> J/Psi phi)

TL;DR

This paper reports the first observation of Bs to Psi(2S) phi decays and measures their branching ratio relative to Bs to J/psi phi, using data from the CDF experiment, providing new insights into Bs decay modes.

Contribution

It presents the first observation of Bs to Psi(2S) phi signals and measures their relative branching ratio, expanding understanding of Bs decay channels.

Findings

First observation of Bs to Psi(2S) phi signals

Measured ratio of branching fractions as 0.52 ± 0.13 (stat.) ± 0.04 (syst.) ± 0.06 (BR)

Data sample of 360 pb^-1 from CDF Run II used

Abstract

We report the first observation of Bs to Psi(2S) phi signals using 360 pb^-1 of CDF Run II data sample, where Psi(2S) decays into mu+mu- and J/psi pi+pi- modes with phi decays to K+K-. We have measured the relative branching ratio of Br(Bs to Psi(2S)phi)/Br(Bs to J/psi phi) using J/psi, Psi(2S) to mu+mu- decay mode. We obtain Br(Bs to Psi(2S)phi)/Br(Bs to J/psi phi) = 0.52 +- 0.13 (stat.) +- 0.04 (syst.) +- 0.06 (BR).