Muon g -2, rare kaon decays, and parity violation from dark bosons

By H. Davoudiasl, Hye-Sung Lee, W. Marciano. 2014

156 citations recorded by the source corpus.

The muon g-2 discrepancy between theory and experiment may be explained by a light vector boson Z_d that couples to the electromagnetic current via kinetic mixing with the photon. We illustrate how the existing electron g-2, pion Dalitz decay, and other direct production data disfavor that explanation if the Z_d mainly decays into e+e-, mu+mu-. Implications of a dominant invisible Z_d decay channel, such as light dark matter, along with the resulting strong bounds from the rare K -> pi + 'missing energy' decay are examined. The K decay constraints may be relaxed if destructive interference effects due to Z-Z_d mass mixing are included. In that scenario, we show that accommodating the muon g-2 data through relaxation of K decay constraints leads to interesting signals for dark parity violation. As an illustration, we examine the alteration of the weak mixing angle running at low Q^2, which can be potentially observable in polarized electron scattering or atomic physics experiments.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f7e75cdf61ca2da7cff72b0dc80f52d8e46fcf8b

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In Nuclear and High Energy Physics

Citations in the corpus

Search for vector mediator of dark matter production in invisible decay mode (2017, methodology): “Constraints from the BaBar [39], E787 and E949 experiments [34, 35], as well as the muon αμ favored area are also shown.”
Particle physics models for the 17 MeV anomaly in beryllium nuclear decays (2016, background): “The strongest bound for mX = 17 MeV is set by the anomalous magnetic moment of the electron, (g − 2)e, which constrains the coupling of the new boson to be [63] |εe| < 1.”
Neutrino Oscillations and Non-standard Interactions (2017, unknown): “Here, we should also check the Z − Z ′ mass mixing [173].”
Search for New Physics with Atoms and Molecules (2017, background): “In addition, dark Z bosons have been proposed (Davoudiasl et al., 2014) that couple to the weak neutral currents, i.e., their interactions are parity violating.”