A measurement of the D0 lifetime using the impact-parameter method is presented. The D0 sample is obtained from identified D* decays in e+e- annihilations into hadrons at center-of-mass energy of 29 GeV. The maximum-likelihood method used is found to be insensitive to the specific choice of cuts and uncertainties in backgrounds, giving the D0 lifetime of [4.61.5 (statistical)-0.5+0.6(systematic)]× 10-13 sec. The consistency and bias of the method are checked. Combining the measurement with the semileptonic branching ratio of D0, we estimate the semileptonic decay rate of D0 to be (1.60.6)×1011 sec-1. The corresponding value of the effective charm-quark mass is found to be consistent with the typical constituent mass of charm quark.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)