Measurement of $${\mathcal B}(B^0_s\rightarrow D_s^{(*)}D_s^{(*)})$$ > and the Lifetime Difference in the $$B_s^0$$ System
- Northwestern Univ., Evanston, IL (United States)
We search for the semi-inclusive process $$B^0_s\rightarrow D_s^{(*)}D_s^{(*)}$$ using 2.8 fb$$^{-1}$$ of $$p \bar{p}$$ collisions at $$\sqrt{s} = 1.96$$ TeV recorded by the D0 detector operating at the Fermilab Tevatron Collider. Under certain theoretical assumptions, these double-charm final states saturate CP-even eigenstates in the $$B_s^0$$ decays, allowing the lifetime difference of the $$B_s^0$$ system to be related to the branching ratio. We observe $$26.6\pm 8.4$$ signal events with a significance above background of 3.2 standard deviations. The branching ratio is measured as $${\cal B}(B^0_s\rightarrow D_s^{(*)}D_s^{(*)}) = 0.035\pm0.010\text{(stat)}\pm0.011\text{(syst)}$$ and, in the Standard Model, the width difference is derived as $$\Delta \Gamma_s^{\rm CP}/\Gamma_s = 0.072\pm0.021\text{(stat)}\pm0.022\text{(syst)}$$.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1369267
- Report Number(s):
- FERMILAB-THESIS-2009-16; PROQUEST-1751743301; AAT-3355730; 821277
- Country of Publication:
- United States
- Language:
- English
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