Heavy Flavor Results from DØ

Abstract

Presented are summaries of four heavy flavour analyses by the DØ Collaboration between August 2011 and June 2012. Using up to 10.4 fb−1 of pp¯ collisions at s=1.96 TeV accumulated by the DØ detector at the Fermilab Tevatron collider, we find evidence for the two-body decay Bs0→J/ψf2′(1525) and measure the branching fraction of these decays relative to Bs0→J/ψϕ as Rf2′/ψ=0.22±0.05(stat.)±0.04(syst). The Λb0 lifetime is measured using the fully reconstructed decay Λb0→J/ψΛ0, along with the lifetime of the topologically similar decay channel Bd0→J/ψKs0. The analyses yields results of τ(Λb0)=1.303±0.075(stat.)±0.035(syst.) ps, τ(Bd0)=1.508±0.025(stat.)±0.043(syst.) ps, and τ(Λb0)/τ(Bd0)=0.864±0.052(stat.)±0.033(syst.) ps. A narrow mass state is observed that decays into ϒ(1S)+γ with an invariant mass of 10.551±0.014(stat.)±0.017(syst.) GeV/c2. Finally, the semileptonic charge asymmetry is measured to be asls=[−1.08±0.72(stat.)±0.17(syst.)]% using the decay channel Bs0(B¯s0)→Ds∓μ±X.