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Neutrino self-interactions and double beta decay

机译:中微子自我相互作用和双β腐烂

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Neutrino self-interactions ( ν SI ) beyond the Standard Model are an attractive possibility to soften cosmological constraints on neutrino properties and also to explain the tension in late and early time measurements of the Hubble expansion rate. The required strength of ν SI to explain the 4 σ Hubble tension is in terms of a pointlike effective four-fermion coupling that can be as high as 10 9 G F , where G F is the Fermi constant. In this work, we show that such strong ν SI can cause significant effects in two-neutrino double beta decay, leading to an observable enhancement of decay rates and to spectrum distortions. We analyze self-interactions via an effective operator as well as when mediated by a light scalar. Data from observed two-neutrino double beta decay are used to constrain ν SI , which rules out the regime around 10 9 G F .
机译:中微子自我相互作用(νSI)超出标准模型是软化中性特性的宇宙学约束的有吸引力的可能性,并且还可以解释哈勃膨胀率的后期和早期测量的张力。 所需的强度为νSi解释4σ刚性张力的尺寸符合可以高达10 9 g f的有效的四个铁饼耦合而言,其中G f是Fermi常数。 在这项工作中,我们表明,这种强大的νSi可能对两个中微子双β腐烂引起显着影响,从而可观察到衰减率和谱畸变的增强。 我们通过有效运营商分析自交互,以及延长标量的介导。 来自观察到的两个中微子双β衰减的数据用于约束νSI,从而规定了大约10 9克F的制度。

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