A complex singlet extension of the Standard Model with a singlet fermion dark matter

被引：2

作者：

Cho, Gi-Chol ^{[1
]}

Idegawa, Chikako ^{[1
]}

Inumiya, Rie ^{[2
]}

机构：

[1] Ochanomizu Univ, Dept Phys, Tokyo 1128610, Japan

[2] Ochanomizu Univ, Grad Sch Humanities & Sci, Tokyo 1128610, Japan

来源：

NUCLEAR PHYSICS B | 2024年 / 1007卷

关键词：

BARYON-NUMBER NONCONSERVATION; ELECTROWEAK; VIOLATION;

D O I：

10.1016/j.nuclphysb.2024.116688

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 examine a complex singlet scalar extension of the Standard Model (CxSM) with an extra singlet fermion. Both the singlet scalar and fermion are dark matter (DM) candidates. It is known that although the scalar potential in the CxSM can realize strong first-order electroweak phase transition, the scalar DM included in the model gives only a tiny amount of the relic density compared to the observed one. Therefore, a fermion DM is introduced to compensate for the lack of relic density. We find that the scattering of the fermion DM and nucleons is sufficiently suppressed when the masses of scalar mediators are degenerate, as is the case of the scalar DM. We show the range of a combination of the mass and the Yukawa coupling of the fermion DM, which satisfies both the observed relic density and conditions of strong first-order electroweak phase transition.

引用

页数：12

共 36 条

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