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arXiv 2203.08166hep-ph
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重中性轻子与单重标量相互作用的限制条件

Constraints on Heavy Neutral Leptons interacting with a singlet scalar

James M. Cline, Guillermo Gambini

摘要:

重中性轻子(HNL)是标准模型的一个有吸引力的最小扩展,就像单重标量$s$与希格斯玻色子混合一样。如果两者都存在,则HNL与$s$相互作用是自然的。对于轻单重态,衰变$N\to sν$可以支配弱HNL衰变。我们重新解释现有的约束HNL混合从DELPHI,CHARM和贝尔实验为0.5-100 GeV的质量HNL,考虑到新的衰变通道。虽然约束通常被削弱,但在某些情况下,由于检测器中可观察到的$s\to\ell^+\ell^-$衰减,它们可以变得更强。这里提出的方法可以用来重铸其他(旧)的实验,而不诉诸计算昂贵的蒙特卡罗模拟的约束。此外,我们更新和纠正了一些错误的分析中的原始约束,在没有的单态。

英文摘要:

Heavy neutral leptons (HNLs) are an attractive minimal extension of the Standard Model, as is a singlet scalar $s$ mixing with the Higgs boson. If both are present, it is natural for HNLs to interact with $s$. For a light singlet,the decay $N\to sν$ can dominate over weak HNL decays. We reinterpret existing constraints on HNL mixing from the DELPHI, CHARM and Belle experiments for 0.5-100 GeV mass HNLs, taking into account the new decay channel. Although the constraints are typically weakened, in some cases they can become stronger, due to observable $s\to\ell^+\ell^-$ decays in the detectors. The method presented here could be used to recast constraints from other (older) experiments without resorting to computationally expensive Monte Carlo simulations. In addition, we update and correct some errors in the analysis of the original constraints, in the absence of the singlet.

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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