Z' Portal Dark Matter in the Minimal B - L Model

被引：52

作者：

Okada, Satomi ^{[1
]}

机构：

[1] Yamagata Univ, Grad Sch Sci & Engn, Yamagata 9908560, Japan

来源：

ADVANCES IN HIGH ENERGY PHYSICS | 2018年 / 2018卷

关键词：

NEUTRINO MASSES; BARYOGENESIS; SYMMETRY; BOSONS; SCALE;

D O I：

10.1155/2018/5340935

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We consider a dark matter scenario in the context of the minimal extension of the Standard Model (SM) with a B - L (baryon number minus lepton number) gauge symmetry, where three right-handed neutrinos with a B - L charge-1 and a B - L Higgs field with a B - L charge + 2 are introduced to make the model anomaly-free and to break the B - L gauge symmetry, respectively. The B - L gauge symmetry breaking generates Majorana masses for the right-handed neutrinos. We introduce a Z(2) symmetry to the model and assign an odd parity only for one right-handed neutrino, and hence the Z(2)-odd right-handed neutrino is stable and the unique dark matter candidate in the model. The so-called minimal seesaw works with the other two right-handed neutrinos and reproduces the current neutrino oscillation data. We consider the case that the dark matter particle communicates with the SM particles through the B - L gauge boson (Z'(B-L) boson) and obtain a lower bound on the B - L gauge coupling (alpha(B-L)) as a function of the Z'(B-L) boson mass (m(Z')) from the observed dark matter relic density. On the other hand, we interpret the recent LHC Run-2 results on the search for a Z' boson resonance to an upper bound on alpha(B-L) as a function of m(Z'). These two constraints are complementary for narrowing down an allowed parameter region for this "Z' portal" dark matter scenario, leading to a lower mass bound of m(Z') >= 3.9 TeV.

引用

页数：12

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