Measurement of Bd mixing using opposite-side flavor tagging

Details Measurement of Bd mixing using opposite-side flavor tagging Measurement of Bd mixing using opposite-side flavor tagging

2006-09-20

arxiv.org/abs/hep-ex/0609034v1

Phys.Rev.D74:112002,2006

Physics

High Energy Physics

High Energy Physics - Experiment

19 pages, 17 figures, submitted to Phys. Rev. D

Scientific paper

10.1103/PhysRevD.74.112002

We report on a measurement of the $B^0_d$ mixing frequency and the calibration of an opposite-side flavor tagger in the D{\O}experiment. Various properties associated with the $b$ quark on the opposite side of the reconstructed $B$ meson were combined using a likelihood-ratio method into a single variable with enhanced tagging power. Its performance was tested with data, using a large sample of reconstructed semileptonic $B \to \mu \dzero X$ and $B \to \mu \dst X$ decays, corresponding to an integrated luminosity of approximately 1 fb$^{-1}$. The events were divided into groups depending on the value of the combined tagging variable, and an independent analysis was performed in each group. Combining the results of these analyses, the overall effective tagging power was found to be eD^2 = (2.48 \pm 0.21 (stat.) ^{+0.08}_{-0.06} (syst.))%. The measured $B^0_d$ mixing frequency dmd = 0.506 \pm 0.020 {\rm (stat) \pm 0.016 (syst) ps}^{-1} is in good agreement with the world average value.

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