Calculation of parity nonconservation in cesium and possible deviation from the Standard Model

الأصل · EN

We have calculated the 6s-7s parity nonconserving E1 transition amplitude (EPNC) in cesium. This calculation has been performed with higher numerical accuracy than our 1989 calculation [V.A. Dzuba, V.V. Flambaum, and O.P. Sushkov, Phys. Lett. A 141, 147]. Also the Breit interaction has been included and the radiative corrections estimated. Our final result is EPNC=0.902 (1 +/- 0.7%)ieaB(QW/N). This represents an improvement in the accuracy of the calculation from the 1% error claimed in 1989. This result corresponds to a nuclear weak charge for Cs, QW=-72.39 (1 +/- 0.4% (exp) +/- 0.7% (theory)). We conclude that there is no significant deviation from the Standard Model value -73.09(3).