6533b856fe1ef96bd12b1c40
RESEARCH PRODUCT
New Physics Constraints from Atomic Parity Violation in $^{133}$Cs
B. K. SahooB. P. DasH. Spiesbergersubject
High Energy Physics - PhenomenologyHigh Energy Physics - Phenomenology (hep-ph)Atomic Physics (physics.atom-ph)FOS: Physical sciencesPhysics - Atomic Physicsdescription
Our improved calculation of the nuclear spin-independent parity violating electric dipole transition amplitude ($E1_{PV}$) for $6s ~ ^2S_{1/2} - 7s ~ ^2S_{1/2}$ in $^{133}$Cs in combination with the most accurate (0.3\%) measurement of this quantity yields a new value for the nuclear weak charge $Q_W=-73.71(26)_{ex} (23)_{th}$ against the Standard Model (SM) prediction $Q_W^{\text{SM}}=-73.23(1)$. The advances in our calculation of $E1_{PV}$ have been achieved by using a variant of the perturbed relativistic coupled-cluster theory which treats the contributions of the core, valence and excited states to $E1_{PV}$ on the same footing unlike the previous high precision calculations. Furthermore, this approach resolves the controversy regarding the sign of the core correlation effects. We discuss the implications of the deviation of our result for $Q_W$ from the SM value by considering different scenarios of new physics.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2021-01-25 |