Measurement of the Bc± Meson Lifetime Using Bc±->J/?+l±+X Decays
This thesis describes a measurement of the average proper decay time of the B±c mesons, the ground state of bottom and charm quark bound states. The lifetime measurement is carried out in the decay modes B±c -> J/?+e±+X and B±c -> J/?+?±+X, where the J/? decays as J/? -> ?+?- and the X are unmeasured particles such as ?e or ??. The data are collect by the CDF II detector which measures the properties of particles created in sqrt(s)=1.96 TeV proton/antiproton collisions delivered by the Fermilab Tevatron. This measurement uses ~fb-1 of integrated luminosity. The measured average proper decay time of B±c mesons, ? = 0.475+0.053-0.049(stat.)±0.018(syst.) ps, is competitive with the most precise measurements in the world and confirms previous measurements and theoretical predictions.
Advisor:Manfred Paulini; Paul Shepard; Joe Boudreau; Vittorio Paolone; Adam Leibovich
School:University of Pittsburgh
School Location:USA - Pennsylvania
Source Type:Master's Thesis
Date of Publication:01/28/2009