B Flavor Tagging Calibration and Search for B$$0\atop{s}$$ Oscillations in Semileptonic Decays with the CDF Detector at Fermilab
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
In this thesis we present a search for oscillations of B$$0\atop{s}$$ mesons using semileptonic B$$0\atop{s}$$ → D$$-\atop{s}$$ℓ+v decays. Data were collected with the upgraded Collider Detector at Fermilab (CDFII) from events produced in collisions of 980 GeV protons and antiprotons accelerated in the Tevatron ring. The total proton-antiproton center-of-mass energy is 1.96 TeV. The Tevatron is the unique source in the world for B$$0\atop{s}$$ mesons, to be joined by the Large Hadron Collider at CERN after 2007. We establish a lower limit on the B$$0\atop{s}$$ oscillation frequency Δms > 7.7 ps-1 at 95% Confidence Level. We also present a multivariate tagging algorithm that identifies semileptonic B → μX decays of the other B mesons in the event. Using this muon tagging algorithm as well as opposite side electron and jet charge tagging algorithms, we infer the B$$0\atop{s}$$ flavor at production. The tagging algorithms are calibrated using high statistics samples of B0 and B+ semileptonic B0/+ → Dℓv decays. The oscillation frequency Δmd in semileptonic B0 → Dℓv decays is measured to be Δmd = (0.501 ± 0.029(stat.) ± 0.017(syst.)) ps-1.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76CH03000
- OSTI ID:
- 879144
- Report Number(s):
- FERMILAB-THESIS-2005-41; TRN: US0700938
- Country of Publication:
- United States
- Language:
- English
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