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

Adare, A. and Makek, Mihael and Zolin, L. (PHENIX Collaboration) (2015) Search for dark photons from neutral meson decays in p+p and d+Au collisions at √sNN=200 GeV. Physical Review C, 91 (3). 31901R-8. ISSN 0556-2813

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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% C.L. 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.

Item Type: Article
Date: 10 March 2015
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (2015) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 31 Mar 2015 11:38
Last Modified: 31 Mar 2015 12:01
URI: http://digre.pmf.unizg.hr/id/eprint/3745

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