Measurement of the CP-violating phase \phi_s^{J/\psi \phi} at D0

TL;DR

This paper reports an updated measurement of the CP-violating phase and decay width difference in Bs0 meson decays, with results consistent with Standard Model predictions, using data from the D0 detector at Fermilab.

Contribution

The paper provides the most recent measurement of P-violating phase nd decay width difference in Bs0 decays, improving precision and confirming Standard Model consistency.

Findings

Measured P-violating phase s .55^{+0.38}_{-0.36} radians.

Measured decay width difference s 0.163^{+0.065}_{-0.064} ps^{-1}.

Results are compatible with Standard Model expectations, p-value = 29.8%.

Abstract

This paper is a report of an updated measurement of the CP-violating phase and the decay width difference for the two mass eigenstates from flavor-tagged decay Bs0 to J/psi phi}. The 68% confidence level intervals, including systematic uncertainties, are phi_s=-0.55 ^{+0.38}_{-0.36}$ and \Delta \Gamma_s = 0.163 ^{+0.065}_{-0.064}$ ps^{-1}. This measurement is in agreement with SM expected value, the p-value for the Standard Model point is 29.8%. The data sample corresponds to an integrated luminosity of 8.0 fb^{-1} accumulated with the D0 detector at the Fermilab Tevatron collider.