Measurement of the Neutral B Meson-B Bar Meson Oscillation Frequency Using Dilepton Events at BABAR

Chao, Ming ; /UC, Irvine

Stanford Linear Accelerator Center

关键词: Maximum-Likelihood Fit;    B Mesons;    Stanford Linear Accelerator Center Experiment-Hep,Hepex;    43 Particle Accelerators;    Mesons;   

DOI  :  10.2172/883296
RP-ID  :  SLAC-R-829
RP-ID  :  AC02-76SF00515
RP-ID  :  883296

美国|英语

来源: UNT Digital Library

【 摘 要 】

This dissertation describes the measurement of the B{sup 0}{bar B}{sup 0} oscillation frequency {Delta}m{sub d} with a sample of 122 x 10{sup 6} B{bar B} pairs collected with the BABAR detector at the PEP-II asymmetric B Factory at the Stanford Linear Accelerator Center. A fully inclusive approach is used to select dilepton events in which B meson decays semileptonically and the lepton's charge is employed to identify the flavor of each B meson. The oscillation frequency {Delta}m{sub d} is extracted from the time evolution of the dilepton events. A maximum likelihood fit to the same sign and opposite sign events simultaneously gives {Delta}m{sub d} = (0.485 {+-} 0.009(stat.) {+-} 0.010(syst.)) ps{sup 1} where the first uncertainty is statistical and the second is systematic. This is one of the single most precise measurements of the B{sup 0}{bar B}{sup 0} oscillation frequency to date.