Protophobic Fifth-Force Interpretation of the Observed Anomaly in Be 8 Nuclear Transitions

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

Research output: Contribution to journalArticlepeer-review

161 Scopus citations

Abstract

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.

Original languageEnglish
Article number071803
JournalPhysical Review Letters
Volume117
Issue number7
DOIs
StatePublished - Aug 11 2016

Bibliographical note

Publisher Copyright:
© 2016 American Physical Society.

ASJC Scopus subject areas

  • General Physics and Astronomy

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