Revisiting Parity Nonconservation in Cesium

Abstract

We apply the sum-over-states approach to calculate partial contributions to the parity nonconservation (PNC) in cesium [Porsev et al, Phys. Rev. D 82, 036008 (2010)]. We have found significant corrections to two non-dominating terms coming from the contribution of the core and highly excited states (n > 9, the so called tail). When these differences are taken into account the result of Porsev et al, EPNC = 0.8906 (24) × 10 −11 i(−QW /N ) changes to 0.8977 (40), coming into good agreement with our previous calculations, 0.8980 (45). The interpretation of the PNC measurements in cesium still indicates reasonable agreement with the standard model (1.5 σ), however gives new constraints on physics beyond it.

Lifetime measurement of the cesium6P3/2level using ultrafast pump-probe laser pulses

“…It is notable for the inclusion of valence triple excitations in the expansion of the cluster amplitude. This work yielded a weak charge for the cesium nucleus in perfect agreement with the standard model, although a later reanalysis [38] revealed a 1.5σ discrepancy in the weak charge value. The corresponding 6P 3/2 D 6S 1/2 result shown in Fig.…”

QED radiative corrections and many-body effects in atoms: vacuum polarization and binding energy shifts in alkali metals

“…[37] for further details about the method. The correlation potential method, using allorders Σ (∞) , has proven to be remarkably successful in high-precision atomic structure calculations for heavy alkali atoms; notably, this method was used to obtain one of the most precise results for parity violation in Cs [39][40][41].…”

Parity-nonconservation effect in the dielectronic recombination of polarized electrons with heavy He-like ions

“…(8) and (9), it was found that the results became similar at R ≥ 5. Thus, levels with R ≥ 5 are regarded as distinguishable.…”

“…The unprecedented experimental precision for the PNC amplitude was obtained in 133 Cs measurements [4,5] and, together with recent progress in QED and atomic structure calculations (see, e.g., Refs. [6][7][8] and references therein), provided the most accurate to date test of the SM with atomic systems. From the theoretical side, further progress in studying the PNC effect with neutral atoms is strongly limited by the uncertainties of the electron-correlation contributions.…”