Measurement of Lifetime and Decay-Width Difference in Bs0J/ψϕ Decays

T. Aaltonen et al. (CDF Collaboration)
Phys. Rev. Lett. 100, 121803 – Published 27 March 2008

Abstract

We measure the mean lifetime τ=2/(ΓL+ΓH) and the decay-width difference ΔΓ=ΓLΓH of the light and heavy mass eigenstates of the Bs0 meson, BsL0 and BsH0, in Bs0J/ψϕ decays using 1.7fb1 of data collected with the CDF II detector at the Fermilab Tevatron pp¯ collider. Assuming CP conservation, a good approximation for the Bs0 system in the standard model, we obtain ΔΓ=0.0760.063+0.059(stat)±0.006(syst)ps1 and τ=1.52±0.04(stat)±0.02(syst)ps, the most precise measurements to date. Our constraints on the weak phase and ΔΓ are consistent with CP conservation.

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  • Received 14 December 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.121803

©2008 American Physical Society

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Vol. 100, Iss. 12 — 28 March 2008

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