The B0 B» 0 average mixing parameter has been extracted from e and ee events produced in pp» collisions at s =1.8 TeV. In a sample of 900 e events, the like-sign to opposite-sign charge ratio R is measured to be 0.556+0.048(stat)-0.042+0.035(syst). In the absence of mixing, the expected value of R would be 0.23+0.06. The corresponding number for 212 ee events is 0.573+0.116(stat)+0.047(syst) with an expected nonmixing value of 0.24+0.07. The observed excess in R leads to a combined determination of =0.176+0.031(stat+syst) +0.032 (model), where the last uncertainty is due to Monte Carlo modeling.
ASJC Scopus subject areas
- Physics and Astronomy(all)