Abstract
In this paper, we perform a detail analysis on the phenomenology of Z' portal scalar and Dirac fermion dark matter in B-L scotogenic Dirac model. Unconventional B-L charge Q is assigned to the right-handed neutrino nu _R in order to realise scotogenic Dirac neutrino mass at one-loop level, where three typical value Q=-,frac{1}{4},-,4,frac{3}{2} are chosen to illustrate. Observational properties involving dilepton signature at LHC, relativistic degrees of freedom N_text {eff}, dark matter relic density, direct and indirect detections are comprehensively studied. Combined results of these observables for the benchmark scenarios imply that the resonance region M_text {DM}sim M_{Z'}/2 is the viable parameter space. Focusing on the resonance region, a scanning for TeV-scale dark matter is also performed to obtain current allowed and future prospective parameter space.
Highlights
It is reasonable to ask if gauged U (1)B−L symmetry can play a key role in the generation of naturally small Dirac neutrino masses
In previous studies [11], we focus on scalar interactions of dark matter (DM) in B − L scotogenic Dirac model
The Z portal scalar DM in B − L scotogenic Dirac model could be tested at direct detection experiments, and Dirac fermion DM could be further probed by indirect detection
Summary
Interest in Dirac neutrino masses has been revived recently and several models [2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20]. It is reasonable to ask if gauged U (1)B−L symmetry can play a key role in the generation of naturally small Dirac neutrino masses. As for Majorana fermion DM in conventional B − L scotogenic Majorana model for neutrino masses [46], no observable signatures are expected at incoming direct or indirect detection experiments except for LHC dilepton signature of Z. The Z portal scalar DM in B − L scotogenic Dirac model could be tested at direct detection experiments, and Dirac fermion DM could be further probed by indirect detection. We perform a comprehensive analysis on the phenomenology of Z portal dark matter in B − L scotogenic Dirac model in aspect of collider signatures, dark radiation, relic density, direct and indirect detection.
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