Muon anomaly and dark parity violation |
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Authors: | Hooman Davoudiasl Hye-Sung Lee William J Marciano |
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Institution: | Department of Physics, Brookhaven National Laboratory, Upton, New York 11973, USA. |
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Abstract: | The muon anomalous magnetic moment exhibits a 3.6σ discrepancy between experiment and theory. One explanation requires the existence of a light vector boson, Z_{d} (the dark Z), with mass 10-500?MeV that couples weakly to the electromagnetic current through kinetic mixing. Support for such a solution also comes from astrophysics conjectures regarding the utility of a U(1)_{d} gauge symmetry in the dark matter sector. In that scenario, we show that mass mixing between the Z_{d} and ordinary Z boson introduces a new source of "dark" parity violation, which is potentially observable in atomic and polarized electron scattering experiments. Restrictive bounds on the mixing (m_{Z_{d}}/m_{Z})δ are found from existing atomic parity violation results, δ^{2}<2×10^{-5}. Combined with future planned and proposed polarized electron scattering experiments, a sensitivity of δ^{2}~10^{-6} is expected to be reached, thereby complementing direct searches for the Z_{d} boson. |
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