Search for dark photons from neutral meson decays in p+p and d+Au collisions at √sNN=200 GeV

Adare, A. and Afanasiev, S. and Aidala, C. and Ajitanand, N. N. and Akiba, Y. and Csanád, Máté and Csörgő, Tamás and Dávid, Gábor and Imrek, József and Kiss, Ádám and Varga-Kőfaragó, Mónika and Nagy, Márton and Ster, András and Sziklai, János István and Tarján, Péter and Vargyas, Márton and Vértesi, Róbert (2015) Search for dark photons from neutral meson decays in p+p and d+Au collisions at √sNN=200 GeV. PHYSICAL REVIEW C, 91. ISSN 2469-9985

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Abstract

The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment (g − 2)μ deviates from SM calculations by 3.6σ. Several theoretical models attribute this to the existence of a “dark photon,” an additional U(1) gauge boson, which is weakly coupled to ordinary photons. The PHENIX experiment at the Relativistic Heavy Ion Collider has searched for a dark photon, U , in π0, η → γe+e− decays and obtained upper limits of O(2 × 10−6) on U -γ mixing at 90% CL for the mass range 30 < mU < 90 MeV/c2. Combined with other experimental limits, the remaining region in the U -γ mixing parameter space that can explain the (g − 2)μ deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29 < mU < 32 MeV/c2 remaining

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