Measurement of Lifetime and Decay-Width Difference in $B_{s}^{0} \to J / ψ ϕ$ Decays

Publisher Website

27 March 2008

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 100 (12) , 121803
https://doi.org/10.1103/physrevlett.100.121803

Abstract

We measure the mean lifetime

τ = 2 / (Γ_{L} + Γ_{H})

and the decay-width difference

Δ Γ = Γ_{L} - Γ_{H}

of the light and heavy mass eigenstates of the

B_{s}^{0}

meson,

B_{s L}^{0}

and

B_{s H}^{0}

, in

B_{s}^{0} \to J / ψ ϕ

decays using

1.7 {fb}^{- 1}

of data collected with the CDF II detector at the Fermilab Tevatron

p \bar{p}

collider. Assuming

C P

conservation, a good approximation for the

B_{s}^{0}

system in the standard model, we obtain

Δ Γ = {0.076}_{- 0.063}^{+ 0.059} (stat) \pm 0.006 (syst) {ps}^{- 1}

and

τ = 1.52 \pm 0.04 (stat) \pm 0.02 (syst) ps

, the most precise measurements to date. Our constraints on the weak phase and

Δ Γ

are consistent with

C P

conservation.

Keywords

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