DeltaGamma_s Measurement at the Upsilon(5S) from Belle

TL;DR

This paper reports the measurement of the decay branching fractions of B_s^0 mesons at the Upsilon(5S) resonance using Belle data, providing insights into the B_s system's CP eigenstates and width differences.

Contribution

First measurement of B_s^0 decay branching fractions at Upsilon(5S) using Belle data, informing CP eigenstate width differences.

Findings

Measured exclusive branching fractions for B_s^0 decays

Estimated the width difference between CP eigenstates

Provided data for testing B_s^0 decay models

Abstract

Using the full Belle Upsilon(5S) data sample of 121 fb^-1we have measured exclusive branching fractions for the decays B_s^0 -> D_s^(*)+D_s^(*)-. Assuming these decay modes saturate decays to CP-even final states, the branching fraction determines the relative width difference between the CP-odd and -even eigenstates of the B_s.