期刊
PHYSICAL REVIEW D
卷 104, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.104.023517
关键词
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资金
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [GA 694896]
- Carlsberg Foundation
The study demonstrates that even a small fraction of mesons present in the primeval plasma can lead to the overproduction of primordial helium-4, limiting the lifetime of thermally produced heavy neutral leptons. Combining this with accelerator searches allows for a new lower bound to be set on HNL masses, defining the bottom line for HNL searches at future Intensity Frontier experiments.
We constrain the lifetime of thermally produced heavy neutral leptons (HNLs) from big bang nucleosynthesis. We show that even a small fraction of mesons present in the primeval plasma leads to the overproduction of primordial helium-4. This constrains the lifetime of HNLs to be tau(N) < 0.02 s for masses above the mass of the pion (as compared to 0.1 s reported previously). In combination with accelerator searches, this allows us to put a new lower bound on the HNL masses and define the bottom line for HNL searches at the future Intensity Frontier experiments.
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