Measurement of the Bs anti-Bs oscillation frequency using semileptonic decays
- Carnegie Mellon Univ., Pittsburgh, PA (United States)
This thesis reports a time dependent measurement of the B$$0\atop{s}$$-$$\bar{B}$$$$0\atop{s}$$ oscillation frequency Δms using semileptonic decays B$$0\atop{s}$$ → D$$-\atop{s}$$ℓ+X. We use a data sample of 1 fb-1 of pp collisions at √s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron Collider to reconstruct ~ 61, 500 semileptonic B$$0\atop{s}$$ decays. This analysis of B$$0\atop{s}$$-$$\bar{B}$$$$0\atop{s}$$ mixing has a sensitivity of 19.4 ps-1 and shows an evidence of B$$0\atop{s}$$ oscillations at Δms ~17.75 ps-1 with an amplitude significance of ~2. In combination with the analyses of ~ 8,700 hadronic B$$0\atop{s}$$ decays at CDF, we have made the first direct observation of time-dependent B$$0\atop{s}$$-$$\bar{B}$$$$0\atop{s}$$ flavor oscillations measuring Δms = 17.77$$+0.09\atop{-0.10}$$ (stat) ± 0.07 (syst) ps -1. The obtained value of Δms agrees with the Standard Model expectation. When combined with the world average values for Δmd, m$$\bar{B}$$0s and m $$\bar{B}$$0s, along with other theoretical input, this result yields the ratio of CKM matrix elements |Vtd/Vts| = 0.2060 ± 0.0007 (exp)$$+0.0081\atop{-0.0060}$$ (theor).
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 908840
- Report Number(s):
- FERMILAB-THESIS-2007-09; TRN: US0703781
- Country of Publication:
- United States
- Language:
- English
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