A measurement of the lifetime using reconstructed mesons
The OPAL Collaboration, K.Ackerstaff8 et al.
8 CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland
Received: 25 July 1997 / Published online: 10 March 1998
We report a measurement of the meson lifetime from decays, where mesons are reconstructed in the and decay channels. From approximately 3.7 million hadronic decays recorded by the OPAL detector at LEP a sample is selected containing 911 83 candidates, of which are estimated to be from meson decays. Fitting the distribution of the distance from the beam spot to the decay vertex of the candidates with an unbinned likelihood function we measure
where the errors are statistical and systematic, respectively.