The B0B0BAR average mixing parameter-chi has been extracted from e-mu and ee events produced in ppBAR collisions at square-root = 1.8 TeV. In a sample of 900 e-mu-events, the like-sign to opposite-sign charge ratio R is measured to be 0.556 +/- 0.048(stat)-0.042(+0.05)(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 chi = 0.176 +/- 0.031 (stat + syst) +/- 0.032(model), where the last uncertainty is due to Monte Carlo modeling.
MEASUREMENT OF B0BBAR0 MIXING AT THE FERMILAB TEVATRON COLLIDER
DELL'ORSO, MAURO;PUNZI, GIOVANNI;
1991-01-01
Abstract
The B0B0BAR average mixing parameter-chi has been extracted from e-mu and ee events produced in ppBAR collisions at square-root = 1.8 TeV. In a sample of 900 e-mu-events, the like-sign to opposite-sign charge ratio R is measured to be 0.556 +/- 0.048(stat)-0.042(+0.05)(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 chi = 0.176 +/- 0.031 (stat + syst) +/- 0.032(model), where the last uncertainty is due to Monte Carlo modeling.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
