标题： 相同电荷的$W^\pm W^\pm$散射中马约拉纳中微子：突破TeV屏障 显示英文标题

标题： Majorana Neutrinos in Same-Sign $W^\pm W^\pm$ Scattering at the LHC: Breaking the TeV Barrier

摘要： 我们重新审视在 $N$ 的非共振重马约拉纳中微子在 $W^\pm W^\pm$ 散射中的敏感性，以及在 $\sqrt{s}=13$ TeV 大型强子对撞机及其高亮度升级版本中的情况。 作为基准情景，我们在现象学 I 型跷跷板模型的框架下进行研究，依赖于 QCD 的次领头阶模拟，并与部分子喷注匹配。 在广泛研究了 $pp\to\mu^\pm\mu^\pm j j$ 过程在振幅和微分层次上的现象学后，我们设计了一个具有显著信号背景分离能力的简单对撞机分析。 在95%的置信水平下，我们发现平方缪子重中微子混合元素$\vert V_{\mu N} \vert^{2}$可以探测到大约$0.06-0.3 ~ (0.03-0.1)$对于$m_N = 1-10~{\rm TeV}$与$\mathcal{L}=300$fb$^{-1}~(3$ab$^{-1})$。 对于更重的质量$m_N = 20~{\rm TeV}$，我们报告对$\vert V_{\mu N} \vert^{2}\gtrsim 0.5~(0.3)$的灵敏度。 $W^\pm W^\pm$散射通道可以大大扩展当前 LHC 对重马约拉纳中微子搜索所覆盖的质量范围，并且在几百 GeV 以上特别增加了无价的灵敏度。 我们还对分析可以改进的领域以及对其他中微子质量模型测试的适用性进行了评论。 显示英文摘要

摘要： We revisit the sensitivity to non-resonant, heavy Majorana neutrinos $N$ in same-sign $W^\pm W^\pm$ scattering at the $\sqrt{s}=13$ TeV LHC and its high-luminosity upgrade. As a benchmark scenario, we work in the context of the Phenomenological Type I Seesaw model, relying on a simulation up to next-to-leading order in QCD with parton shower matching. After extensively studying the phenomenology of the $pp\to\mu^\pm\mu^\pm j j$ process at the amplitude and differential levels, we design a simple collider analysis with remarkable signal-background separation power. At 95\% confidence level we find that the squared muon-heavy neutrino mixing element $\vert V_{\mu N} \vert^{2}$ can be probed down to about $0.06-0.3 ~ (0.03-0.1)$ for $m_N = 1-10~{\rm TeV}$ with $\mathcal{L}=300$ fb$^{-1}~(3$ ab$^{-1})$. For heavier masses of $m_N = 20~{\rm TeV}$, we report sensitivity for $\vert V_{\mu N} \vert^{2}\gtrsim 0.5~(0.3)$. The $W^\pm W^\pm$ scattering channel can greatly extend the mass range covered by current LHC searches for heavy Majorana neutrinos and particularly adds invaluable sensitivity above a few hundred GeV. We comment on areas where the analysis can be improved as well as on the applicability to other tests of neutrino mass models.