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The dark photon is a hypothetical elementary particle, proposed as an electromagnetic force carrier for dark matter.[1] Dark photons would theoretically be detectable via their mixing with ordinary photons, and subsequent effect on the interactions of known particles.[1]

Dark photons were proposed in 2008 by Lotty Ackerman, Matthew R. Buckley, Sean M. Carroll, and Marc Kamionkowski as the force carrier of a new long-range U(1) gauge field, "dark electromagnetism", acting on dark matter.[2] Like the ordinary photon, dark photons would be massless.[2]

Dark photons were suggested to be a possible cause of the so-called 'g–2 anomaly' obtained by experiment E821 at Brookhaven National Laboratory,[3] which appears to be three to four standard deviations above the Standard-Model values of Hagawara et al.[4] and Davier et al.[5] However, dark photons were largely ruled out as a cause of the anomaly by several experiments, including the PHENIX detector at the Relativistic Heavy Ion Collider at Brookhaven.[1] A new experiment at Fermilab, the Muon g-2 experiment, expects to produce a precision four times better than the Brookhaven experiment.[6]
See also

Dark radiation
Photino

References

Walsh, Karen McNulty (February 19, 2015). "Data from RHIC, other experiments nearly rule out role of 'dark photons' as explanation for 'g-2' anomaly". PhysOrg. Retrieved 23 February 2015.
Carroll, Sean M. (October 29, 2008). "Dark photons". Retrieved 23 February 2015.
Bennett, G. W.; Bousquet, B.; Brown, H. N.; Bunce, G.; Carey, R. M.; Cushman, P.; Danby, G. T.; Debevec, P. T. (2006-04-07). "Final report of the E821 muon anomalous magnetic moment measurement at BNL". Physical Review D 73 (7): 072003. doi:10.1103/PhysRevD.73.072003.
Hagawara, Kaoru; Liao, Ruofan; Martin, Alan D.; Nomura, Daisuke; Teubner, Thomas (June 23, 2011). "(g − 2)μ and α(M2Z) re-evaluated using new precise data". Journal of Physics G: Nuclear and Particle Physics (IOP Publishing) 38 (8). doi:10.1088/0954-3899/38/8/085003. Retrieved 10 December 2015.
Davier, M.; Hoecker, A.; Malaescu, B.; Zhang, Z. (January 2011). "Reevaluation of the hadronic contributions to the muon g−2 and to α(M2Z)". The European Physical Journal C (Springer-Verlag) 71. doi:10.1140/epjc/s10052-010-1515-z. ISSN 1434-6052. Retrieved 10 December 2015.
"Muon g-2 Experiment". Fermilab. Retrieved 10 December 2015.

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