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# Protophobic Fifth-Force Interpretation of the Observed Anomaly inBe8Nuclear Transitions

Feng, Jonathan L.; Fornal, Bartosz; Galon, Iftah; Gardner, Susan; Smolinsky, Jordan; Tait, Tim M. P; Tanedo, Philip

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<dc:creator>Feng, Jonathan L.</dc:creator>
<dc:creator>Fornal, Bartosz</dc:creator>
<dc:creator>Galon, Iftah</dc:creator>
<dc:creator>Gardner, Susan</dc:creator>
<dc:creator>Smolinsky, Jordan</dc:creator>
<dc:creator>Tait, Tim M. P</dc:creator>
<dc:creator>Tanedo, Philip</dc:creator>
<dc:date>2016-08-11</dc:date>
<dc:description>Recently a 6.8σ anomaly has been reported in the opening angle and invariant mass distributions of e+e- pairs produced in Be8 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, Be*8→Be8 X, and then decays through X→e+e-. The X boson mediates a fifth force with a characteristic range of 12 fm and has millicharged 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.</dc:description>
<dc:identifier>https://zenodo.org/record/1059042</dc:identifier>
<dc:identifier>10.1103/physrevlett.117.071803</dc:identifier>
<dc:identifier>oai:zenodo.org:1059042</dc:identifier>
<dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
<dc:title>Protophobic Fifth-Force Interpretation of the Observed Anomaly inBe8Nuclear Transitions</dc:title>
<dc:type>info:eu-repo/semantics/other</dc:type>
<dc:type>publication-other</dc:type>
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