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

Aaltonen, T; Abulencia, A; Adelman, J; Akimoto, T; Albrow, MG; Gonzalez, BA; Amerio, S; ... CDF Collaboration; + view all (2008) Measurement of lifetime and decay-width difference in B-S(0)-> J/psi phi decays. Physical Review Letters , 100 (12) , Article 121803. 10.1103/PhysRevLett.100.121803. Green open access

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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 pp 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.

Type: Article
Title: Measurement of lifetime and decay-width difference in B-S(0)-> J/psi phi decays
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.100.121803
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.100.121803
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: ANGULAR-DISTRIBUTIONS, DETECTOR
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/131669
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