Measurements of lifetimes and a limit on the lifetime difference in the neutral d-meson system

Fermilab E791 Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

Using the large hadroproduced charm sample collected in experiment E791 at Fermilab, we report the first directly measured constraint on the decay-width difference Delta Gamma for the mass eigenstates of the D0-D0bar system. We obtain our result from lifetime measurements of the decays D0 ⤍ K-pi+ and D0 ⤍ K-K+, under the assumption of CP invariance, which implies that the CP eigenstates and the mass eigenstates are the same. The lifetime of D0 ⤍ K-K+ (the CP-even final state is \tau_KK = 0.410 +/- 0.011 +/- 0.006 ps, and the lifetime of D0 ⤍ K-pi+ (an equal mixture of CP-odd and CP-even final states is tau_Kpi = 0.413 +/- 0.003 +/- 0.004 ps. The decay-width difference is Delta Gamma = 2(Gamma_KK - Gamma_Kpi) = 0.04 +/- 0.14 +/- 0.05 ps^-1. We relate these measurements to measurements of mixing in the neutral D-meson system.

Original languageEnglish
Pages (from-to)32-36
Number of pages5
JournalPhysical Review Letters
Volume83
Issue number1
DOIs
StatePublished - 1999

Fingerprint

Dive into the research topics of 'Measurements of lifetimes and a limit on the lifetime difference in the neutral d-meson system'. Together they form a unique fingerprint.

Cite this