arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2202.08508hep-ph
收藏

狄拉克暗物质、暗辐射和替代$U(1)_X$标准模型中的II型跷跷板机制

Dirac dark matter, dark radiation, and the type-II seesaw mechanism in alternative $U(1)_X$ standard model

Nobuchika Okada, Osamu Seto

摘要:

我们提出了一个额外的$U(1)_X$模型与一个替代的电荷分配的右手右手中微子。三重态Higgs场的第二类跷跷板机制由于电荷的交替分配而有望产生中微子质量。一个额外的希格斯双重态的小真空期望值(VEV)自然会导致三重态希格斯场的非常小的VEV,因此可以理解中微子质量的小。在电荷为$1$的$U(1)_X$的最小希格斯场下,右手中微子是狄拉克暗物质(DM)和暗辐射(DR)的候选者。我们已经推导出并施加了LHC约束,DR约束和DM直接搜索的范围内的参数空间。在各种$U(1)_X$选择中,发现DM直接搜索边界对于$U(1)_R$是最弱的,其中来自热DM和不可忽略的DR的约束可以兼容。从所谓的哈勃张力的观点来看,这样数量的有效中微子种类将是有趣的。

英文摘要:

We propose an extra $U(1)_X$ model with an alternative charge assignment for right-handed right-handed neutrinos. The type-II seesaw mechanism by a triplet Higgs field is promising for neutrino mass generation because of the alternative charge assignment. The small vacuum expectation value (VEV) of an additional Higgs doublet naturally leads to a very small VEV of the triplet Higgs field, and as a result, the smallness of neutrino mass can be understood. With the minimal Higgs field for $U(1)_X$ with the charge $1$, right-handed neutrinos are candidates for Dirac dark matter (DM) and dark radiation (DR). We have derived and imposed the LHC bound, the DR constraint and the bound from DM direct searches in the wide range of parameter space. Among various $U(1)_X$ choices, the DM direct search bound is found to be weakest for $U(1)_R$ where the constraints from thermal DM and non-negligible DR can be compatible. Such a number of the effective neutrino species would be interesting from the viewpoint of the so-called Hubble tension.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑