First observation of the decay $$\bar{B}$$$$0\atop{s}$$ → D$$±\atop{s}$$ K∓ and measurement of the relative branching fraction B($$\bar{B}$$$$0\atop{s}$$→ D$$±\atop{s}$$ K∓)/B($$\bar{B}$$$$0\atop{s}$$→ D$$+\atop{s}$$ π-).
- Univ. of California, Berkeley, CA (United States)
We present the first observation of the decay $$\bar{B}$$$$0\atop{s}$$→ D$$±\atop{s}$$ K∓ and measure the relative branching fraction of $$\bar{B}$$$$0\atop{s}$$ → D$$±\atop{s}$$ K∓ to $$\bar{B}$$$$0\atop{s}$$ → D$$+\atop{s}$$ π-. The measurement of the relative branching fraction is performed by applying a fit in invariant mass and specific ionization to 1.2 fb-1 of Ds(φπ)X data collected with the CDF II detector in pp collisions at √ s = 1.96 TeV at the Fermilab Tevatron collider. We measure B $$\bar{B}$$$$0\atop{s}$$ → D$$±\atop{s}$$ K∓ /B $$\bar{B}$$$$0\atop{s}$$ → D$$+\atop{s}$$ π- = 0.107±0.019(stat)±0.008(sys). The statistical significance of the $$\bar{B}$$$$0\atop{s}$$ → D$$±\atop{s}$$ K∓ signal is 7.9σ. To cross-check our analysis method, we also measure B $$\bar{B0}$$→ D+K- /B $$\bar{B0}$$ → D+π- and B $$\bar{B0}$$ → D+*K- /B $$\bar{B0}$$ → D*+π- and verify that our results are in agreement with the world average.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 924534
- Report Number(s):
- FERMILAB-THESIS-2007-52
- Country of Publication:
- United States
- Language:
- English
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