WIMP dark matter expected in the parity solution to the strong CP problem
WIMP dark matter expected in the parity solution to the strong CP problem
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发表时间：
2018-12
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通讯作者：
Junichiro Kawamura;Shohei Okawa;Y. Omura;Yong Tang
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作者：
Junichiro Kawamura;Shohei Okawa;Y. Omura;Yong Tang
我们构造了一个扩展的标准模型（SM），由强CP问题和暗物质的动机。在我们的模型中，宇称对称性通过引入具有额外规范对称性的镜像扇区SU（2）_R \times U（1）_R$而在高能下守恒。SU（2）_R \times U（1）_R$的电荷以与SM中相同的方式分配给镜像场，但是镜像费米子的手征性与宇称对称性相反。强CP问题得到解决，因为镜夸克也在SM中的$SU（3）_c$下带电。在极小设置中，镜像规范对称性导致稳定的色粒子，因此我们引入两个标量以避免稳定的色粒子。有趣的是，其中一个标量由于规范对称性而变得稳定，因此它可以成为一个很好的暗物质候选者。在本文中，我们特别研究了与暗物质有关的唯象。我们还讨论了中微子扇区，并表明，右手中微子从镜扇区可以增加中微子或暗辐射的有效数量为0.14 $。
We construct an extended Standard Model (SM), motivated by the strong CP problem and dark matter. In our model, parity symmetry is conserved at high energy by introducing a mirror sector with the extra gauge symmetry, $SU(2)_R \times U(1)_R$. The charges of $SU(2)_R \times U(1)_R$ are assigned to the mirror fields in the same way as in the SM, but the chirality of the mirror fermions is opposite to respect the parity symmetry. The strong CP problem is resolved, since the mirror quarks are also charged under the $SU(3)_c$ in the SM. In the minimal setup, the mirror gauge symmetry leads stable colored particles, so that we introduce two scalars in order to avoid the stable colored particle. Interestingly, one of the scalars becomes stable because of the gauge symmetry, so that it can be a good dark matter candidate. In this paper, we especially study the phenomenology relevant to the dark matter. We also discuss the neutrino sector and show that the right-handed neutrinos from the mirror sector can increase the effective number of neutrinos or dark radiation by $0.14$.