相互难以捉摸：类矢量反轻子与轻子夸克
Mutually elusive: vectorlike antileptons and leptoquarks
AI总结：
本文研究了具有与标准模型轻子二重态相同规范荷但轻子数相反的类矢量费米子的性质，发现其通过重标量轻子夸克介导衰变，且模型对称性使其免受现有对撞机标准衰变探测，导致其比标准衰变模型更难以捉摸。
摘要：
我们研究了类矢量费米子的性质，它们具有与标准模型轻子二重态相同的规范荷，但轻子数相反。这些反轻子通过更重的标量轻子夸克介导进行衰变，而该可重整化模型的对称性保护了类矢量费米子和轻子夸克免受迄今为止在 collider 中探测到的标准衰变的影响。如果新粒子主要与第二代夸克耦合，那么它们的 collider 探测涉及多喷流和两个 tau 轻子或中微子，并受到大背景的阻碍。如果与第三代夸克的耦合很大，那么 collider 信号涉及 top 夸克，并且可以在 LHC 中更有效地探测。即使在那种情况下，类矢量费米子二重态和轻子夸克仍然比具有标准衰变的模型更难以捉摸。
英文摘要：
We study the properties of vectorlike fermions that have the same gauge charges as the Standard Model lepton doublets, but opposite lepton number. These antileptons undergo decays mediated by heavier scalar leptoquarks, while the symmetries of this renormalizable model protect the vectorlike fermions and the leptoquarks from standard decays probed so far at colliders. If the new particles couple predominantly to second-generation quarks, then their collider probes involve multiple jets and two taus or neutrinos, and are hampered by large backgrounds. If couplings to third-generation quarks are large, then the collider signals involve top quarks, and can be probed more efficiently at the LHC. Even in that case, both the vectorlike fermion doublet and the leptoquarks remain more elusive than in models with standard decays.
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