2012/05/31 by Hooman Davoudiasl, Hye-Sung Lee, Hye‐Sung Lee +1 · 1 citation
Physics and Astronomy · #Anomalous magnetic dipole moment #Dark Matter and Cosmic Phenomena #Dark matter #Electron #Gauge boson #Gauge theory #Hidden sector #Muon #Nuclear physics #Observable #Parity (physics) #Particle Detector Development and Performance #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Quantum mechanics #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevlett.109.031802
Version to appear in PRL
arxiv created 2012/07/06 · openalex publication_date 2012/07/18 · arxiv updated 2015/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
The muon anomalous magnetic moment exhibits a 3.6\ensuremathσ discrepancy between experiment and theory. One explanation requires the existence of a light vector boson, Zd (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 Zd 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_Zd/mZ)\ensuremathδ are found from existing atomic parity violation results, \ensuremathδ2<2\ifmmode×\else\texttimes\fi10^\ensuremath-5. Combined with future planned and proposed polarized electron scattering experiments, a sensitivity of \ensuremathδ2\ensuremath∼10^\ensuremath-6 is expected to be reached, thereby complementing direct searches for the Zd boson.