Measurement of B0-B0 flavor oscillations using jet-charge and lepton flavor tagging in pp¯ collisions at s=1.8TeV

Phys. Rev. D 60, 072003 – Published 10 September 1999
F. Abe et al. (CDF Collaboration)


We present a measurement of the mass difference Δmd for the B0 meson and the statistical power of the b flavor tagging methods used. The measurement uses 90pb-1 of data from pp¯ collisions at s=1.8TeV collected with the CDF detector. An inclusive lepton trigger is used to collect a large sample of B hadron semileptonic decays. The mass difference Δmd 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 Δmd=(0.500±0.052±0.043)ħps-1, where the first uncertainty is statistical and the second uncertainty is systematic. The statistical powers (εD2) of the soft-lepton and jet-charge flavor taggers are (0.91±0.10±0.11)% and (0.78±0.12±0.08)%, respectively.


  • Received 16 March 1999
  • Published 10 September 1999

© 1999 The American Physical Society

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