[1604.07411] Protophobic Fifth Force Interpretation of the Observed Anomaly in $^8$Be Nuclear Transitions

[1604.07411] Protophobic Fifth Force Interpretation of the Observed Anomaly in $^8$Be Nuclear Transitions: "Protophobic Fifth Force Interpretation of the Observed Anomaly in 8Be Nuclear Transitions Jonathan L. Feng, Bartosz Fornal, Iftah Galon, Susan Gardner, Jordan Smolinsky, Tim M. P. Tait, Philip Tanedo (Submitted on 25 Apr 2016 (v1), last revised 15 Aug 2016 (this version, v2)) Recently a 6.8σ anomaly has been reported in the opening angle and invariant mass distributions of e+e− pairs produced in 8Be nuclear transitions. The data are explained by a 17 MeV vector gauge boson X that is produced in the decay of an excited state to the ground state, 8Be∗→8BeX, and then decays through X→e+e−. The X boson mediates a fifth force with a characteristic range of 12 fm and has milli-charged couplings to up and down quarks and electrons, and a proton coupling that is suppressed relative to neutrons. The protophobic X boson may also alleviate the current 3.6σ discrepancy between the predicted and measured values of the muon's anomalous magnetic moment. Comments: 6 pages, 2 figures; v2: published version Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th) Journal reference: Phys. Rev. Lett. 117, 071803 (2016) DOI: 10.1103/PhysRevLett.117.071803 Report number: UCI-TR-2016-09 Cite as: arXiv:1604.07411 [hep-ph]   (or arXiv:1604.07411v2 [hep-ph] for this version) "

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