在LHC上揭示重Majorana中微子的喷流子结构
Jet substructure shedding light on heavy Majorana neutrinos at the LHC
摘要：
微小中微子质量和味道混合的存在可以在各种跷跷板模型中自然地解释，其中许多模型通常具有额外的马约拉纳型SM规范单线态右手中微子（$N$）。如果它们在电弱尺度附近，并且与轻活性中微子有相当大的混合，它们可以在高能对撞机中产生，例如大型强子对撞机（LHC）。一个特征信号是相同符号的轻子对，违反轻子数，以及光喷流-- $pp\to N\ell^{\pm}, \; N\to\ell^{\pm}W^{\mp}, \; W^{\mp}\to jj$。我们提出了一个新的搜索策略，利用射流子结构技术，观察到一个沉重的右手中微子质量$M_N$远高于$M_{W^\pm}$，两个喷流出来的助推$W^\pm$可以被解释为一个单一的脂肪喷流（$J$）。因此，区分信号拓扑将是$\ell^{\pm}\ell^{\pm} J$。对不同的信号区域进行全面的研究，并进行完整的背景分析，结合检测器级模拟，我们计算统计显著性限值。我们发现对于质量范围为$300$ GeV $\leq M_N \leq 800$ GeV和不同轻重中微子混合$|V_{μN}|^{2}$的重中微子都能有效地探测到。在13 TeV的LHC与3000 $\mathrm{fb}^{-1}$的综合光度可以胜任探索混合角远低于目前的LHC的限制，而且超过了从电弱精度数据的界限。
英文摘要：
The existence of tiny neutrino masses and flavor mixings can be explained naturally in various seesaw models, many of which typically having additional Majorana type SM gauge singlet right handed neutrinos ($N$). If they are at around the electroweak scale and furnished with sizeable mixings with light active neutrinos, they can be produced at high energy colliders, such as the Large Hadron Collider (LHC). A characteristic signature would be same sign lepton pairs, violating lepton number, together with light jets -- $pp\to N\ell^{\pm}, \; N\to\ell^{\pm}W^{\mp}, \; W^{\mp}\to jj$. We propose a new search strategy utilising jet substructure techniques, observing that for a heavy right handed neutrino mass $M_N$ much above $M_{W^\pm}$, the two jets coming out of the boosted $W^\pm$ may be interpreted as a single fat-jet ($J$). Hence, the distinguishing signal topology will be $\ell^{\pm}\ell^{\pm} J$. Performing a comprehensive study of the different signal regions along with complete background analysis, in tandem with detector level simulations, we compute statistical significance limits. We find that heavy neutrinos can be explored effectively for mass ranges $300$ GeV $\leq M_N \leq 800$ GeV and different light-heavy neutrino mixing $|V_{μN}|^{2}$. At the 13 TeV LHC with 3000 $\mathrm{fb}^{-1}$ integrated luminosity one can competently explore mixing angles much below present LHC limits, and moreover exceed bounds from electroweak precision data.
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