Measurement of CP violation phase phi_s and charge asymmetries in B^0_(s) decays at D0

TL;DR

This paper reports measurements of the CP violation phase phi_s and charge asymmetries in B^0_s decays at the D0 experiment, revealing slight deviations from the Standard Model predictions based on data from Fermilab's Tevatron Collider.

Contribution

First measurement of phi_s and charge asymmetries in B^0_s decays at D0 with combined results indicating potential deviations from the Standard Model.

Findings

Measured phi_s = -0.57^{+0.24}_{-0.30} radians with a 1.8 sigma deviation.

Combined results with CDF show a 2.2 sigma deviation from the Standard Model.

Observed charge asymmetries consistent with previous measurements.

Abstract

The CP violation phase phi_s and charge asymmetries in B^0_s decays have been measured by the D0 experiment in Run II of the Fermilab Tevatron Collider where proton anti-proton collisions take place at a center of mass energy of sqrt{s}=1.96 TeV. The measurements are based on integrated luminosities between 1.0 fb^-1 and 2.8 fb^-1. A 1.8 sigma deviation from the Standard Model is observed in the measurement of the CP violation phase phi_s=-0.57^{+0.24}_{-0.30} (stat) ^{+0.07}_{-0.02} (syst) rad in the decay channel B^0_s -> J/psi phi. A combination with CDF results yields a 2.2 sigma deviation from the Standard Model.