We measure the mean lifetime tau=2/(Gamma(L)+Gamma(H)) and the decay-width difference Delta Gamma=Gamma(L)-Gamma(H) of the light and heavy mass eigenstates of the B-s(0) meson, B-sL(0) and B-sH(0), in B-s(0)-> J/psi phi decays using 1.7 fb(-1) of data collected with the CDF II detector at the Fermilab Tevatron p (p) over bar collider. Assuming CP conservation, a good approximation for the B-s(0) system in the standard model, we obtain Delta Gamma=(0.076(-0.063)(+0.059)(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 Delta Gamma are consistent with CP conservation.

Measurement of lifetime and decay-width difference in B-s(0)-> J/psi phi decays

CIOCCI, MARIA AGNESE;DONATI, SIMONE;PUNZI, GIOVANNI;
2008-01-01

Abstract

We measure the mean lifetime tau=2/(Gamma(L)+Gamma(H)) and the decay-width difference Delta Gamma=Gamma(L)-Gamma(H) of the light and heavy mass eigenstates of the B-s(0) meson, B-sL(0) and B-sH(0), in B-s(0)-> J/psi phi decays using 1.7 fb(-1) of data collected with the CDF II detector at the Fermilab Tevatron p (p) over bar collider. Assuming CP conservation, a good approximation for the B-s(0) system in the standard model, we obtain Delta Gamma=(0.076(-0.063)(+0.059)(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 Delta Gamma are consistent with CP conservation.
2008
T., Aaltonen; A., Abulencia; J., Adelman; T., Akimoto; M. G., Albrow; B. A., Gonzalez; S., Amerio; D., Amidei; A., Anastassov; A., Annovi; J., Antos; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828555
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