Measurement of lifetime and decay-width difference in Bs0→J/ψϕ decays

Aaltonen, T., Abulencia, A., Adelman, J., Akimoto, T., Albrow, M., Álvarez González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A. et al.
). (2008) Measurement of lifetime and decay-width difference in Bs0→J/ψϕ decays. Physical Review Letters, Vol.100 (No.12). Article no. 121803. doi:10.1103/PhysRevLett.100.121803 ISSN 0031-9007.

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Abstract

We measure the mean lifetime τ=2/(ΓL+ΓH) and the decay-width difference ΔΓ=ΓL-ΓH of the light and heavy mass eigenstates of the Bs0 meson, BsL0 and BsH0, in Bs0→J/ψϕ decays using 1.7  fb-1 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=0.076-0.063+0.059(stat)±0.006(syst)  ps-1 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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