论文标题
Kaon衰减的重型中性瘦素在船舶实验中
Heavy Neutral Leptons from kaon decays in the SHiP experiment
论文作者
论文摘要
我们从船舶实验框架中预期的KAON衰减中计算出假设重的中性瘦素（HNL或无菌中微子）的信号速率。 kaons是在Beam-Dump模式下由CERN SPS的400 GEV质子在Beam-Dump模式下启动的Hadronic淋浴中生产的。对于足够轻的HNL（允许衰减时），我们发现Kaon衰减是HNL的明显丰富来源，而与先前对船舶HNL现象学研究的研究相比，Meson的衰变与$ d $ -Meson的衰变相比。特别是，船能够充分探索HNL质量运动区域的中央部分，并与电子和元中微子混合到较低的宇宙学结合。后者与早期宇宙中的HNL衰变有关，以恢复能量产物，从而破坏原始核合成下产生的光核。 HNL模型与较小混合的一致性将需要层次结构 - 所有HNL与Tau Neutmino的混合更大，或者在HNL领域的非标准宇宙学和新成分，从而使最小的非见面I类模型与无菌中微子和小于KAONS更轻。
We calculate the signal rate of hypothetical heavy neutral leptons (HNL or sterile neutrinos) from kaon decays expected in the framework of the SHiP experiment. The kaons are produced in the hadronic shower initiated in the beam-dump mode by 400 GeV protons from CERN SPS. For a sufficiently light HNL (when the decays are kinematically allowed) we find kaon decays to be a noticeably richer source of HNL as compared to $D$-meson decays adopted in previous studies of the HNL phenomenology at SHiP. In particular, SHiP is capable of fully exploring the central part of the kinematically allowed region of the HNL mass and mixing with electron and muon neutrinos down to the lower cosmological bound. The latter is associated with HNL decays in the early Universe to energetic products rescattering off and thus destroying light nuclei produced at the primordial nucleosynthesis. A consistency of the HNL model with smaller mixing would require either a hierarchy -- much larger mixing of all the HNL with tau neutrino -- or non-standard cosmology and new ingredients in the HNL sector, closing the room for the minimal non-seesaw type I model with sterile neutrinos lighter than kaons.
