A new viable mass region of dark matter and dirac neutrino mass generation in a scotogenic extension of SM

被引：1
作者：
Hazarika, Nilavjyoti [1 ]
Bora, Kalpana [1 ]
机构：
[1] Gauhati Univ, Dept Phys, Gauhati, Assam, India
来源：
INTERNATIONAL JOURNAL OF MODERN PHYSICS A | 2023年 / 38卷 / 11期
关键词：
Beyond standard model; dark matter; neutrino mass; XENON1T; MODEL;
D O I：
10.1142/S0217751X23500513
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
In this paper, we propose a scotogenic extension of the Standard Model (SM) which can provide a scalar dark matter (DM) candidate in the new, theoretically previously unaddressed, intermediate region (200 <= M-DM <= 550 GeV) and also generate light Dirac neutrino masses. In this framework, the SM is extended by three gauge singlet fermions, two singlet scalar fields and one additional scalar doublet along with a continuous global symmetry U(1)(B-L) and discrete symmetries Z(2) and Z(4). These additional symmetries prevent the singlet fermions from obtaining Majorana mass terms along with providing the stability to the DM candidate. It is known that in the case of the scalar singlet DM model, the only region which is not yet excluded is a narrow region close to the Higgs resonance m(S) similar or equal to mh/2 - others ruled out from different experimental and theoretical bounds. In the case of the inert doublet model, the mass region (similar to 60{80 GeV) and the high-mass region (heavier than 550 GeV) are allowed. This motivates us to explore a parameter range in the intermediate-mass region M-W <= M-DM <= 550 GeV, which we do in a scotogenic extension of SM with a scalar doublet and scalar singlets. The DM in our model is a mixture of singlet and doublet scalars, in the freeze-out scenario. We constrain the allowed parameter space of the model using the Planck bound on present DM relic abundance, neutrino mass and the latest bound on spin-independent DM-nucleon scattering cross-section from the XENON1T experiment. Further, we constrain the DM parameters from the indirect detection bounds arising from the global analysis of the Fermi-LAT observations of dwarf spheroidal satellite (dSphs) galaxies, Higgs invisible decay and Electroweak Precision Test (EWPT) as well. We find that our model findings may provide a viable DM candidate satisfying all the constraints on DM parameters in the new, previously unexplored mass range (200 <= MDM <= 550 GeV). This new window for the DM candidate could be searched in future experiments along with an explanation of the Dirac mass of neutrinos since so far there is no strong evidence in support of the Majorana nature of neutrino mass.
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