LHC的轻子信号中新物理的多喷流鉴别器
Multijet Discriminators for New Physics in Leptonic Signals at the LHC
摘要：
在LHC的早期运行中，新物理学的一些最干净的信号将涉及强产生的粒子，这些粒子通过弱相互作用态到稳定粒子的级联衰变产生多轻子。一些最壮观的末态将涉及三个或更多的轻子，多个喷流，通常也缺少能量动量。我们知道，新物理学中最有趣的三种模型中，有三种能引起这种信号：（1）具有R-宇称守恒的超对称性;（2）具有KK-宇称守恒的普适额外维;（3）具有T-宇称守恒的小希格斯模型。如果标准模型增加了第四代连续的重费米子，也可能出现类似的信号。我们研究了所有这些可能性，并表明，一组明智选择的观测，关键涉及可识别的喷气机和轻子的数量，可以共同提供这些模型的每个不同的足迹。事实上，这种观测量的简单的成对相关性可以使基础模型的明确识别，即使是相对较小的数据样本。
英文摘要：
Some of the cleanest signals for new physics in the early runs of the LHC will involve strongly-produced particles which give rise to multiple leptons by undergoing cascade decays through weakly-interacting states to stable particles. Some of the most spectacular final states will involve three or more leptons, multiple jets and generally missing energy-momentum as well. A triad of the most interesting models of new physics which induce such signals is known to consist of (i) supersymmetry with R-parity conservation, (ii) a universal extra dimension with conservation of KK-parity and (iii) little Higgs models with conserved T-parity. Similar signals could also arise if the Standard Model is augmented with a fourth sequential generation of heavy fermions. We study all these possibilities and show that a judiciously chosen set of observables, critically involving the number of identifiable jets and leptons, can collectively provide distinct footprints for each of these models. In fact, simple pairwise correlation of such observables can enable unambiguous identification of the underlying model, even with a relatively small data sample.
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