Leptogenesis from oscillations of heavy neutrinos with large mixing angles
Leptogenesis from oscillations of heavy neutrinos with large mixing angles
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DOI：
10.1007/jhep12(2016)150
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发表时间：
2016-06
影响因子：
5.4
通讯作者：
M. Drewes;B. Garbrecht;Dario Gueter;J. Klaric
中科院分区：
文献类型：
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作者：
M. Drewes;B. Garbrecht;Dario Gueter;J. Klaric
用重右手中微子对标准模型的扩展可以同时用跷跷板机制解释观测到的中微子质量和用轻子生成解释宇宙的重子不对称性。如果重中微子的质量低于电弱标度，它们可能会在大型强子对撞机、贝儿II、NA62、拟议中的SHiP实验或未来的高能对撞机中发现。在这个质量范围内，重子的不对称性是通过重中微子在产生过程中的CP破坏振荡产生的。我们从非平衡量子场论的第一性原理出发，包括旁观者过程和反馈效应，研究了这种情况下宇宙重子不对称性的产生。我们从以前的计算中消除了一些不确定性，发现宇宙的重子不对称性可以用更大的重中微子混合角来解释，增加了实验发现的机会。对于右手中微子的快速和强过阻尼振荡的极限情况，重子不对称性的产生可以解析地计算到一阶修正。
The extension of the Standard Model by heavy right-handed neutrinos can simultaneously explain the observed neutrino masses via the seesaw mechanism and the baryon asymmetry of the Universe via leptogenesis. If the mass of the heavy neutrinos is below the electroweak scale, they may be found at the LHC, BELLE II, NA62, the proposed SHiP experiment or a future high-energy collider. In this mass range, the baryon asymmetry is generated via CP-violating oscillations of the heavy neutrinos during their production. We study the generation of the baryon asymmetry of the Universe in this scenario from first principles of non-equilibrium quantum field theory, including spectator processes and feedback effects. We eliminate several uncertainties from previous calcula-tions and find that the baryon asymmetry of the Universe can be explained with larger heavy neutrino mixing angles, increasing the chance for an experimental discovery. For the limiting cases of fast and strongly overdamped oscillations of right-handed neutrinos, the generation of the baryon asymmetry can be calculated analytically up to corrections of order one.