Measurement of $B/s$ lifetime, decay width difference and polarization amplitude of the $$B/s\to J/\Psi \phi$$ decays at CDF II
- Trieste U.
In this thesis the update of the measurement of the B$$^{0}_{s}$$ lifetime, the decay width difference between its heavy and light mass eigenstates and the polarization amplitudes of B$$^{0}_{s}$$ $$\rightarrow$$ J/$$\psi\phi$$ decays of the $$^{0}_{s}$$ meson is presented. About 9600 B$$^{0}_{s}$$ → J/ψφ decays have been reconstructed in the final state [$$\mu^{+}$$ $$\mu^{−}$$ ][K$$^{+}$$K$$^{-}$$ ] using a dataset of p ̄$$\overline{p}$$ collisions at $$\sqrt{s}$$ = 1.96 TeV corresponding to 8.4 fb$$^{-1}$$ integrated luminosity collected by the CDFII detector at the Fermilab Tevatron collider. The results are extracted from an analysis of the angular distributions of muons and kaons as a function of the decay time through an unbinned maximum likelihood fit which exploits identification of the quark content (b or $$\overline{b}$$ of the strange bottom meson at the time of production. Assuming the Standard Model prediction for the size of CP violation occurring in the B$$^{0}_ {s}$$ mixing, the estimated lifetime, decay width difference, polarization amplitudes and strong phase of the perpendicular amplitude are: τ (B$$^{0}_{s}$$) = 1.527 $$\pm$$ 0.021(stat.)ps, $$\Delta\Gamma$$ = 0.063 $$\pm$$ 0.029(stat.)ps$$^{-1}$$, $$\mid$$A$$_{parallel}$$ (0)$$\mid^{2}$$ = 0.233 $$\pm$$ 0.014(stat.), $$\mid$$A$$_[0}$$ $$\mid^{2}$$ = 0.514 $$\pm$$ 0.012(stat.), $$\delta_{perpendicular}$$ = 2.95 $$\pm$$ 0.61(stat.)
- 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:
- 1436695
- Report Number(s):
- FERMILAB-MASTERS-2011-11; 1670916
- Country of Publication:
- United States
- Language:
- English
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