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# Measurement of Lifetime and Decay-Width Difference in $B^0_s \to J/{\psi} \phi$ Decays

Abstract : We measure the mean lifetime, tau=2/(Gamma_L+Gamma_H), and the width difference, DeltaGamma=Gamma_L-Gamma_H, of the light and heavy mass eigenstates of the B0s meson, B0sL and B0sH, in B0s -> J/psi phi decays using 1.7 fb^-1 of data collected with the CDF II detector at the Fermilab Tevatron ppbar collider. Assuming CP conservation, a good approximation for the B0s system in the Standard Model, we obtain DeltaGamma = 0.076^+0.059_-0.063 (stat.) +- 0.006 (syst.) ps^-1 and tau = 1.52 +- 0.04 (stat.) +- 0.02 (syst.) ps, the most precise measurements to date. Our constraints on the weak phase and DeltaGamma are consistent with CP conservation. Dedicated to the memory of our dear friend and colleague, Michael P. Schmidt
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Journal articles
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http://hal.in2p3.fr/in2p3-00198449
Contributor : Dominique Girod Connect in order to contact the contributor
Submitted on : Monday, December 17, 2007 - 12:43:22 PM
Last modification on : Tuesday, January 25, 2022 - 12:48:10 PM

### Citation

T. Aaltonen, A. Abulencia, J. Adelman, T. Akimoto, M.G. Albrow, et al.. Measurement of Lifetime and Decay-Width Difference in $B^0_s \to J/{\psi} \phi$ Decays. Physical Review Letters, American Physical Society, 2008, 100, pp.121803. ⟨10.1103/PhysRevLett.100.121803⟩. ⟨in2p3-00198449⟩

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