Measurement of exclusive B lifetimes in the modes B+ to J/psi K+, B+ to J/psi K*+, B0 to J/psi K*, and B0 to J/psi K0 short, and measurement of the B+/B0 lifetime ratio

摘要

This thesis presents the results from the measurement of the lifetimes of charged and neutral B mesons in four final statesin proton-antiproton collisions at a center-of-mass energy of 1.96 TeV using 195 inverse-picobarns of data collected with the CDF detector at the Fermilab Tevatron Collider. The proper decay length is estimated using the J/psi vertex in all cases to reduce the systematics in the ratio.For the Bu meson, the mean life (ctau) is determined to be 499 +- 12 +- 6 microns; for the neutral B meson (Bd), 446+-15+-8 microns. In both measurements, the first error is statistical and the second is systematic. The ratio between Bu and Bd meson lifetimes is found to be 1.119 +- 0.046(stat) +- 0.014(syst).