Flipped $U(1)$ extended Standard Model and Majorana dark matter

Abstract

We propose a general flavor-independent extension of the Standard Model (SM) with the minimal particle content, based on the symmetry $SU(3{)}_C\times SU(2{)}_L\times U(1{)}_{Y^{\prime }}\times U(1{)}_X\times Z_2$. In this scenario, the charge operator is identified in terms of the charges of two $U(1)$ gauge symmetries. The light neutrino masses are generated via Type-I seesaw mechanism only with two heavy right-handed neutrinos acquiring their Majorana masses through the $U(1{)}_{Y^{\prime }}\times U(1{)}_X$ symmetry breaking. We study various experimental constraints on the parameters of the model and investigate the phenomenology of the right-handed neutrino dark matter (DM) candidate assigned a $Z_2$-odd parity. We find that the most important constraints are the observed DM relic abundance, the current LHC limits, and the ambiguity of the SM neutral gauge boson mass.

21 pages, 14 figures, accepted for publication in Eur. Phys. J. C

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