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

Abstract : We report an updated measurement of the CP-violating phase, $\phi_s^{J/\psi \phi}$, and the decay-width difference for the two mass eigenstates, $\Delta \Gamma_s$, from the flavor-tagged decay $B_s^0 \rightarrow J/\psi \phi$. The data sample corresponds to an integrated luminosity of 8.0 fb$^{-1}$ accumulated with the D0 detector using $p \overline p$ collisions at $\sqrt{s} = 1.96$ TeV produced at the Fermilab Tevatron collider. The 68% confidence level intervals, including systematic uncertainties, are $\Delta \Gamma_s = 0.163 +0.065 -0.064 ps^{-1}$ and $\phi_s^{J/\psi \phi} = -0.55 +0.38 -0.36$. The $p$-value for the Standard Model point is 29.8%.
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http://hal.in2p3.fr/in2p3-00623831
Contributor : Sylvie Flores <>
Submitted on : Thursday, September 15, 2011 - 11:11:52 AM
Last modification on : Wednesday, September 16, 2020 - 4:19:56 PM

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V.M. Abazov, F. Badaud, U. Bassler, G. Bernardi, M. Besancon, et al.. Measurement of the CP-violating phase $\phi_s^{J/\psi \phi}$ using the flavor-tagged decay $B_s^0 \rightarrow J/\psi \phi$ in 8 fb$^{-1}$ of $p \overline p$ collisions. Physical Review D, American Physical Society, 2012, 85, pp.032006. ⟨10.1103/PhysRevD.85.032006⟩. ⟨in2p3-00623831⟩

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