Lifetime Difference and CP-Violating Phase in the B_s⁰ System

Authors

V. M. Abazov, Joint Institute for Nuclear Research, Dubna, Russia
Kenneth A. Bloom, University of Nebraska-LincolnFollow
Gregory R. Snow, University of Nebraska-LincolnFollow
D0 Collaboration

Date of this Version

3-23-2007

Comments

Published by American Physical Society. Phys. Rev. Lett. 98, 121801 (2007). http://prl.aps.org. Copyright © 2007 American Physical Society. Permission to use.

Abstract

From an analysis of the decay B_s⁰ → J/ψφ, we obtain the width difference between the light and heavy mass eigenstates ΔΓ≡(Γ_L - Γ_H ) = 0.17 ± 0.09(stat) ± 0.02(syst) ps^-1 and the CP-violating phase φ_s= -0.79 ± 0.56(stat) _-0.01^+0.14 (syst). Under the hypothesis of no CP violation (φ_{s ≡ 0), we obtain 1/ Γ̅= τ̅Bs⁰ = 1.52 ± 0.08(stat) 0.03^+0.01(syst) ps and ΔΓ 0.12-0.10^+0.08(stat) ± 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 CP-violating mixing phase in the Bs⁰ system.}