论文标题
改善了重型中性瘦素的BBN约束
Improved BBN constraints on Heavy Neutral Leptons
论文作者
论文摘要
我们从原始核合成中限制了热产生的重中性瘦素（HNL）的寿命。我们表明，即使是原始等离子体中存在的一小部分介子也会导致原始氦气的生产过多。这在HNLS $τ_{n} <0.02 $ s的寿命上构成了上限。结合加速器搜索，这使我们能够在HNLS质量上放置一个新的下限，并在未来的强度边界实验中定义HNL搜索的“底线”。
We constrain the lifetime of thermally produced Heavy Neutral Leptons (HNLs) from primordial nucleosynthesis. We show that even a small fraction of mesons present in the primordial plasma leads to the over-production of the primordial helium. This puts an upper bound on the lifetime of HNLs $τ_{N}<0.02$ s for masses $m_{N}>m_π$ (as compared to 0.1 s reported previously). In combination with accelerator searches, this allows us to put a new lower bound on the HNLs masses and defining the "bottom line" for HNL searches at the future Intensity Frontier experiments.
