Measurement of the Ratio of Branching Fractions Br(B$$0\atop{s}$$ → D$$-\atop{s}$$ π+)/Br(B0 → D- π+) at CDF-II
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
The measurement of B$$0\atop{s}$$ mixing is one of the flagship analyses for the Run II B physics program. The sensitivity of the measurement to the frequency of B$$0\atop{s}$$ oscillations strongly depends on the number of reconstructed B$$0\atop{s}$$ mesons. They present the measurement of the ratio of branching fractions Br(B$$0\atop{s}$$ → D$$-\atop{s}$$π+)/Br(B0 → D-π+), which directly influences the number of B$$0\atop{s}$$ events available for the measurement of B$$0\atop{s}$$ mixing at CDF-II. They analyze 115 pb-1 of data collected with the CDF-II detector in p$$\bar{p}$$ collisions at √s = 1.96 TeV using a novel displaced track trigger. They reconstruct 78 ± 11 B$$0\atop{s}$$ → D$$-\atop{s}$$π+ decays at 1153 ± 45 B0 → D-π+ decays with good signal to background ratio. This is the world's largest sample of fully reconstructed B$$0\atop{s}$$ → D$$-\atop{s}$$π+ decays. They find the ratio of production fractions multiplied by the ratio of branching fractions to be: fs/fd • Br(B$$0\atop{s}$$ → D$$-\atop{s}$$π+)/Br(B0 → D-π+) = 0.325 ± 0.046(stat) ± 0.034(syst) ± 0.084 (BR). Using the world average value of fs/fd = 0.26 ± 0.03, we infer that the ratio of branching fractions is: Br(B$$0\atop{s}$$ → D$$-\atop{s}$$π+)/Br(B0 → D-π+) = 1.25 ± 0.18(stat) ± 0.13(syst) ± 0.32(BR) ± 0.14(PR) where the last uncertainty is due to the uncertainty on the world average measurement of the ratio of B$$0\atop{s}$$ to B0 production rates, fs/fd.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 948159
- Report Number(s):
- FERMILAB-THESIS-2004-78; TRN: US0901571
- Country of Publication:
- United States
- Language:
- English
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