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arXiv 2409.09113hep-ph
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热轻子生成

Hot Leptogenesis

Michael J. Baker, Ansh Bhatnagar, Djuna Croon, Jessica Turner

AI总结:

本文研究了最轻右手中微子部门在高于标准模型温度下建立动理平衡的“热轻子生成”场景,推导并数值求解了相关演化方程,发现该方法解决了标准轻子生成场景中的轻子和Higgs质量微调问题。

摘要:

我们研究了一类轻子生成场景,其中包含最轻右手中微子的部门在温度 $T_{N_1} > T_\ ext{SM}$ 下建立动理平衡,其中 $T_\ ext{SM}$ 是标准模型部门的温度。我们研究了实现这种“热轻子生成”的再加热过程,以及维持动理和化学平衡的条件。我们推导并求解了两组演化方程,取决于热部门内是否存在化学平衡,并在基准场景中数值求解这些方程。我们将该模型的可行参数空间与具有热初始条件的标准轻子生成场景进行比较,发现热轻子生成解决了标准场景中存在的轻子和Higgs质量微调问题。

英文摘要:

We investigate a class of leptogenesis scenarios in which the sector containing the lightest right-handed neutrino establishes kinetic equilibrium at a temperature $T_{N_1} > T_\text{SM}$, where $T_\text{SM}$ is the temperature of the Standard Model sector. We study the reheating processes which realise this "hot leptogenesis" and the conditions under which kinetic and chemical equilibrium can be maintained. We derive and solve two sets of evolution equations, depending on the presence of chemical equilibrium within the hot sector, and numerically solve these for benchmark scenarios. We compare the viable parameter space of this model with standard leptogenesis scenarios with a thermal initial condition and find that hot leptogenesis resolves the neutrino and Higgs mass fine-tuning problems present in the standard scenario.

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。

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