Search for dark photons from neutral meson decays in p plus p and d plus Au collisions at root s(NN)=200 GeV

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2015-03-10
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Adare, Andrew
Apadula, Nicole
Campbell, Sarah
Ding, Lei
Dion, Alan
Hill, John
Kempel, Todd
Lajoie, John
Lebedev, Alexandre
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Ogilvie, Craig
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Physics and Astronomy
Physics and astronomy are basic natural sciences which attempt to describe and provide an understanding of both our world and our universe. Physics serves as the underpinning of many different disciplines including the other natural sciences and technological areas.
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The standard model (SM) of particle physics is spectacularly successful, yet the measured value of the muon anomalous magnetic moment (g - 2)mu deviates from SM calculations by 3.6 sigma. 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 pi(0), eta -> gamma e(+)e(-) decays and obtained upper limits of O(2 x 10(-6)) on U-gamma mixing at 90% C.L. for the mass range 30 < m(U) < 90 MeV/c(2). Combined with other experimental limits, the remaining region in the U-gamma mixing parameter space that can explain the (g - 2)(mu) deviation from its SM value is nearly completely excluded at the 90% confidence level, with only a small region of 29 < m(U) < 32 MeV/c(2) remaining.

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This is an article from Physical Review C 92 (2015): 031901, doi:10.1103/PhysRevC.91.031901. Posted with permission.

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Thu Jan 01 00:00:00 UTC 2015
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