Lifetime Difference and $C P$ -Violating Phase in the $B_{s}^{0}$ System

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21 March 2007

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

Vol. 98 (12) , 121801
https://doi.org/10.1103/physrevlett.98.121801

Abstract

From an analysis of the decay

B_{s}^{0} \to J / ψ ϕ

, we obtain the width difference between the light and heavy mass eigenstates

Δ Γ \equiv (Γ_{L} - Γ_{H}) = 0.17 \pm 0.09 (stat) \pm 0.02 (syst) {ps}^{- 1}

and the

C P

-violating phase

ϕ_{s} = - 0.79 \pm 0.56 (stat)_{- 0.01}^{+ 0.14} (syst)

. Under the hypothesis of no

C P

violation (

ϕ_{s} \equiv 0

), we obtain

1 / \bar{Γ} = \bar{τ} (B_{s}^{0}) = 1.52 \pm 0.08 (stat)_{- 0.03}^{+ 0.01} (syst) ps

and

Δ Γ = {0.12}_{- 0.10}^{+ 0.08} (stat) \pm 0.02 (syst) {ps}^{- 1}

. The data sample corresponds to an integrated luminosity of about

1.1 {fb}^{- 1}

accumulated with the D0 detector at the Fermilab Tevatron collider. This is the first direct measurement of the

C P

-violating mixing phase in the

B_{s}^{0}

system.

Keywords

NATURAL SCIENCES

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Version 1, 2007-01-09, ArXiv

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