We present a measurement of the mass difference Delta m(d) for the B-0 meson and the statistical power of the b flavor tagging methods used. The measurement uses 90 pb(-1) of data from collisions at root s=1.8 TeV collected with the CDF detector. An inclusive lepton trigger is used to collect a large sample of B hadron semileptonic decays. The mass difference Delta m(d) is determined from the proper time dependence of the fraction of B hadrons that undergo flavor oscillations. The flavor at decay is inferred from the charge of the lepton from semileptonic B decay. The initial flavor is inferred by determining the flavor of the other B hadron produced in the collision, either from its semileptonic decay (soft-lepton tag) or from its jet charge. The measurement yields Delta m(d)=(0.500+/-0.052+/-0.043)(h) over bar ps(-1), where the first uncertainty is statistical and the second uncertainty is systematic. The statistical powers (epsilon D-2) of the soft-lepton and jet-charge flavor taggers are (0.91+/-0.10 +/-0.11)% and (0.78+/-0.12+/-0.08)%, respectively.
Measurement of the associatedγ+μ±production cross section inpp¯collisions ats=1.8TeV
DONATI, SIMONE;PUNZI, GIOVANNI;
1999-01-01
Abstract
We present a measurement of the mass difference Delta m(d) for the B-0 meson and the statistical power of the b flavor tagging methods used. The measurement uses 90 pb(-1) of data from collisions at root s=1.8 TeV collected with the CDF detector. An inclusive lepton trigger is used to collect a large sample of B hadron semileptonic decays. The mass difference Delta m(d) is determined from the proper time dependence of the fraction of B hadrons that undergo flavor oscillations. The flavor at decay is inferred from the charge of the lepton from semileptonic B decay. The initial flavor is inferred by determining the flavor of the other B hadron produced in the collision, either from its semileptonic decay (soft-lepton tag) or from its jet charge. The measurement yields Delta m(d)=(0.500+/-0.052+/-0.043)(h) over bar ps(-1), where the first uncertainty is statistical and the second uncertainty is systematic. The statistical powers (epsilon D-2) of the soft-lepton and jet-charge flavor taggers are (0.91+/-0.10 +/-0.11)% and (0.78+/-0.12+/-0.08)%, respectively.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.