Measurement of the $CP$-violating phase $\phi^{J/\psi\phi}_s$ using the flavor-tagged decay $B_s^0\rightarrow J/\psi\phi$ in $8\ \text{fb}^{-1}$ of $p\bar p$ collisions

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2012
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American Physical Society
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We report an updated measurement of the $CP$-violating phase, $\phi^{J/\psi\phi}_s$, and the decay-width difference for the two mass eigenstates, $\Delta\Gamma_s$, from the flavor-tagged decay $B^0_s\rightarrow J/\psi\phi$. The data sample corresponds to an integrated luminosity of $8.0\ \text{fb}^{−1}$ accumulated with the D0 detector using $p\bar p$ collisions at $\sqrt s=1.96  \text{TeV}$ produced at the Fermilab Tevatron collider. The 68% Bayesian credibility intervals, including systematic uncertainties, are $\Delta\Gamma_s=0.163^{+0.065}_{−0.064}  \text{ps}^{−1}$ and $\phi^{J/\psi\phi}_s=−0.55^{+0.38}_{−0.36}$. The $p$-value for the Standard Model point is 29.8%.
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Abazov, V. M., Abbott, B., Acharya, B. S., Adams, M., Adams, T., Alexeev, G. D., . . . Zivkovic, L. (2012). Measurement of the $CP$-violating phase $\phi^{J/\psi\phi}_s$ using the flavor-tagged decay $B_s^0\rightarrow J/\psi\phi$ in $8\ \text{fb}^{-1}$ of $p\bar p$ collisions. Physical Review D - Particles, Fields, Gravitation and Cosmology, 85(3), 032006. http://dx.doi.org/10.1103/PhysRevD.85.032006
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© 2012 American Physical Society.
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