Bs Decays at the Tevatron

TL;DR

This paper reports the first measurements of the branching ratio and polarization amplitudes in Bs to Phi Phi decays, providing new experimental data relevant for understanding Bs decay dynamics.

Contribution

It presents the first measurement of polarization fractions in Bs to Phi Phi decays and determines the branching ratio using Tevatron data.

Findings

Branching ratio B(Bs to Phi Phi) = (2.40 +/- 0.21 +/- 0.27 +/- 0.82) x 10^{-5}

Polarization fractions: |A_0|^2 = 0.348, |A_parallel|^2 = 0.287, |A_perp|^2 = 0.365

First measurement of polarization in this decay mode

Abstract

We present measurements of the branching ratio and of the polarization amplitudes in charmless Bs to Phi Phi decays using data corresponding to 2.9/fb of integrated luminosity, collected by the CDF experiment at the Tevatron. The branching ratio in Bs to Phi Phi decays is measured relative to the normalization mode Bs to J/Psi Phi$ to be B(Bs to Phi Phi)/B(Bs to J/Psi Phi) = [1.78 +/- 0.14 (stat) +/- 0.20 (syst)] x 10^{-2}. Using the experimental value of B(Bs to J/Psi Phi) we determine the Bs to Phi Phi branching ratio B(Bs to Phi Phi) = 2.40 +/- 0.21(stat) +/- 0.27(syst) +/- 0.82 (BR)] x 10^{-5}. The polarization fractions are measured for the first time in this analysis and found to be: |A_0|^2 = 0.348 +/- 0.041 (stat) +/- 0.021 (syst) |A_parallel|^2 = 0.287 +/- 0.043 (stat) +/- 0.011 (syst) |A_perp|^2 = 0.365 +/- 0.044 (stat) +/- 0.027 (syst).