Implications of right-handed neutrinos in B-L extended standard model with scalar dark matter

被引：27

作者：

Bandyopadhyay, Priyotosh ^{[1
]}

Chun, Eung Jin ^{[2
]}

Mandal, Rusa ^{[3
,4
]}

机构：

[1] Indian Inst Technol Hyderabad, Sangareddy 502287, Telengana, India

[2] Korea Inst Adv Study, Seoul 130722, South Korea

[3] Inst Math Sci, Madras 600113, Tamil Nadu, India

[4] Homi Bhabha Natl Inst, Training Sch Complex, Bombay 400085, Maharashtra, India

来源：

PHYSICAL REVIEW D | 2018年 / 97卷 / 01期

基金：

欧盟地平线“2020”;

关键词：

D O I：

10.1103/PhysRevD.97.015001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We investigate the Standard Model (SM) with a U(1)(B-L) gauge extension where a B-L charged scalar is a viable dark matter (DM) candidate. The dominant annihilation process, for the DM particle is through the B-L symmetry breaking scalar to right-handed neutrino pair. We exploit the effect of decay and inverse decay of the right-handed neutrino in thermal relic abundance of the DM. Depending on the values of the decay rate, the DM relic density can be significantly different from what is obtained in the standard calculation assuming the right-handed neutrino is in thermal equilibrium and there appear different regions of the parameter space satisfying the observed DM relic density. For a DM mass less than O(TeV), the direct detection experiments impose a competitive bound on the mass of the U(1)(B-L) gauge boson Z ' with the collider experiments. Utilizing the non-observation of the displaced vertices arising from the right-handed neutrino decays, bound on the mass of Z ' has been obtained at present and higher luminosities at the LHC with 14 TeV centre of mass energy where an integrated luminosity of 100 fb(-1) is sufficient to probe mZ 'similar to 5.5 TeV.

引用

页数：12

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