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Nuclear Theory·nucl-th

Thursday·May 5, 2022

8 papers—6 primary·2 cross-listed

All8Primary6Cross-lists2
  1. 07

    Improved Limit on Tensor Currents in the Weak Interaction from Li Decay

    M. T. Burkey · G. Savard · A. T. Gallant · N. D. Scielzo · T. Y. Hirsh · L. Varriano · G. H. Sargsyan · K. D. Launey · M. Brodeur · D. P. Burdette · E. Heckmaier · K. Joerres and 19 other authors

    The electroweak interaction in the Standard Model (SM) is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this work, we present the most precise measurement of tensor currents in the low-energy regime by examining the - correlation of trapped Li ions with the Beta-decay Paul Trap. We find at for the case of coupling to right-handed neutrinos , which is consistent with the SM prediction.

    ↳ nucl-exhep-phnucl-thPRL(2022)·38 citations
  2. 08

    Constraints on the dark photon from parity violation and the mass

    A. W. Thomas🇦🇺 · X. G. Wang🇦🇺

    We present an analysis of the experimental data for parity-violating electron scattering (PVES) and atomic parity-violation, including the effects of a dark photon. We derive the favored region of dark photon parameter space, which provides a good description of the experimental data from the Qweak Collaboration and the Jefferson Lab PVDIS Collaboration and simultaneously relieves the tension between the neutron skin thickness determined in the PREX-II experiment and nuclear-model predictions. In addition, we extract the parameter region required to explain the latest W-boson mass anomaly. Our results indicate that a heavy dark photon with mass above the Z boson mass is favored, while other sources of new physics beyond the Standard Model in addition to the dark photon would also be expected.

    ↳ hep-phhep-exnucl-thPRD(2022)·28 citations

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first authorsco-authorsvia INSPIRE