Measurement of the Ratios of Branching Fractions B(Bs->Ds- pi+)/B(B0->D-pi+) and B(B+->D0bar pi+)/B(B0->D-pi+)

TL;DR

This paper reports the first observation of the decay Bs -> Ds- pi+ at a p pbar collider and measures the ratios of branching fractions for various B meson decays, providing new experimental data in heavy flavor physics.

Contribution

It provides the first measurement of the ratio B(Bs -> Ds- pi+) / B(B0 -> D- pi+) at a p pbar collider, with improved statistics and systematic analysis.

Findings

First observation of Bs -> Ds- pi+ decay at p pbar collider

Measured ratio B(Bs -> Ds- pi+) / B(B0 -> D- pi+) = 1.32 +/- 0.18 (stat.) +/- 0.38 (syst.)

Measured ratio B(B+ -> D0bar pi+) / B(B0 -> D- pi+) = 1.97 +/- 0.10 (stat.) +/- 0.21 (syst.)

Abstract

We report an observation of the decay Bs -> Ds- pi+ in p pbar collisions at sqrt(s) = 1.96 TeV using 115 pb^(-1) of data collected by the CDF II detector at the Fermilab Tevatron. We observe 83 +/- 11 Bs -> Ds- pi+ candidates, representing a large increase in statistics over previous measurements and the first observation of this decay at a p pbar collider. We present the first measurement of the relative branching fraction B(Bs -> Ds- pi+) / B(B0 -> D- pi+) = 1.32 +/- 0.18 (stat.) +/- 0.38 (syst.). We also measure B(B+ -> D0bar pi+) / B(B0 -> D- pi+) = 1.97 +/- 0.10(stat.) +/- 0.21(syst.), which is consistent with previous measurements.