Atomki Anomaly in Family-Dependent $U(1{)}^{\prime }$ Extension of the Standard Model

Abstract

In the context of a gauge invariant, non-anomalous and family-dependent (non-universal) $U(1{)}^{\prime }$ extension of the Standard Model, wherein a new high scale mechanism generates masses and couplings for the first two fermion generations and the standard Higgs mechanism does so for the third one, we find solutions to the anomaly observed by the Atomki collaboration in the decay of excited states of Beryllium, in the form of a very light $Z^{\prime }$ state, stemming from the $U(1{)}^{\prime }$ symmetry breaking, with significant axial couplings so as to evade a variety of low scale experimental constraints.

7 pages, 2 figures

References in corpus (5)

• New Fixed-Target Experiments to Search for Dark Gauge Forces
• Particle Physics Models for the 17 MeV Anomaly in Beryllium Nuclear Decays
• Protophobic Light Vector Boson as a Mediator to the Dark Sector
• Probing a dark photon using rare leptonic kaon and pion decays
• The new interaction suggested by the anomalous ${}^8$Be transition sets a rigorous constraint on the mass range of dark matter

Cited by in corpus (3)

• Dynamical Evidence For a Fifth Force Explanation of the ATOMKI Nuclear Anomalies
• Anomalies in ${}^8$Be nuclear transitions and $(g-2{)}_{e,\mu }$: towards a minimal combined explanation
• ${}^8$Be Decay Anomaly and Light $Z^{\prime }$