How dark is the ν R -philic dark photon?

Abstract We consider a generic dark photon that arises from a hidden U(1) gauge symmetry imposed on right-handed neutrinos (ν R ). Such a ν R -philic dark photon is naturally dark due to the absence of tree-level couplings to normal matter. However, loop-induced couplings to charged leptons and quarks are inevitable, provided that ν R mix with left-handed neutrinos via Dirac mass terms. We investigate the loop-induced couplings and find that the ν R -philic dark photon is not inaccessibly dark, which could be of potential importance to future dark photon searches at SHiP, FASER, Belle-II, LHC 14 TeV, etc.

Abstract licence: CC BY

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