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arXiv 2005.12077hep-phhep-ex
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宇宙学束缚、暗物质和真空稳定性中的夸克三重态跷跷板和轻子生成

Purely Triplet Seesaw and Leptogenesis within Cosmological Bound, Dark Matter and Vacuum Stability

Mina Ketan Parida, Mainak Chakraborty, Swaraj Kumar Nanda, Riyanka Samantaray

摘要:

在一个新的标准模型扩展中,有人提出,即使在没有右手中微子和I型跷跷板的情况下,导致宇宙重子不对称的纯粹的三重态轻子生成也可以通过两个重希格斯三重态来实现,这两个重希格斯三重态也为中微子质量提供了II型跷跷板。在这项工作中,我们讨论这个模型的层次中微子质量与最近确定的宇宙学边界和振荡数据,包括$θ_{23}$在第二个八分圆和大狄拉克CP阶段的一致。在此基础上,我们还讨论了暗物质和标量势的真空稳定性问题。我们发现,对于正常和倒置的顺序的模型拟合振荡数据的总和的三个中微子的质量与宇宙学的界限确定从普朗克卫星数据一致。此外,使用此模型ananastrophic CP-不对称性和玻尔兹曼方程的解决方案,我们还展示了如何成功的预测重子不对称性出现的情况下,unflavored和两个flavored leptogeneses。与额外的$Z_2$离散对称性,这个模型的最小扩展被证明是能够预测一个标量单重WIMP暗物质与直接和间接的观察。而在原始模型中,标量势的重整化群运行使其具有可伸缩性,导致真空不稳定性,在最小扩展模型中暗物质的存在确保了稳定性。虽然由于遗迹密度和直接探测截面的组合约束允许这个标量单线态暗物质质量为$m_ξ=750$ GeV,但额外的真空稳定性约束将这个极限值推到$m_ξ=1.3$ TeV,这可以通过正在进行的实验来验证。我们还讨论了标准Higgs质量辐射稳定性的模型参数约束。

英文摘要:

In a novel standard model extension it has been suggested that, even in the absence of right-handed neutrinos and type-I seesaw, purely triplet leptogenesis leading to baryon asymmetry of the universe can be realised by two heavy Higgs triplets which also provide type-II seesaw ansatz for neutrino masses. In this work we discuss this model for hierarchical neutrino masses in concordance with recently determined cosmologocal bounds and oscillation data including $θ_{23}$ in the second octant and large Dirac CP phases. We also address the issues on dark matter and vacuum stability of the scalar potential in a minimal extension of this model. We find that for both normal and inverted orderings the model fits the oscillation data with the sum of the three neutrino masses consistent with cosmological bounds determined from Planck satellite data. In addition using this model ansatz for CP-asymmetry and solutions of Boltzmann equations, we also show how successful prediction of baryon asymmetry emerges in the cases of both unflavoured and two-flavoured leptogeneses. With additional $Z_2$ discrete symmetry, a minimal extension of this model is shown to be capable of predicting a scalar singlet WIMP dark matter in agreement with direct and indirect observations. Whereas in the original model, the renormalization group running of the scalar potential renders it negatve leading to vacuum instability, the presence of the dark matter in the minimally extended model ensures stability. Although the combined constraints due to relic density and direct detection cross section allow this scalar singlet dark matter mass to be $m_ξ=750$ GeV, the additional vacuum stability constraint pushes this limiting value to $m_ξ=1.3$ TeV which is verifiable by ongoing experiments. We also dicuss constraint on the model parameters for the radiative stability of the standard Higgs mass.

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