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

Title
Search for dark photons from neutral meson decays in p plus p and d plus Au collisions at root s(NN)=200 GeV
Author
김용균
Keywords
DETECTOR; ENERGIES; PROTON; RAYS
Issue Date
2015-03
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW C, v. 91, NO 3, Page. 1-8
Abstract
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.
URI
http://journals.aps.org/prc/abstract/10.1103/PhysRevC.91.031901http://hdl.handle.net/20.500.11754/23156
ISSN
0556-2813; 1089-490X
DOI
10.1103/PhysRevC.91.031901
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > NUCLEAR ENGINEERING(원자력공학과) > Articles
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