arXiv 2005.064752020-05hep-phhep-ex

大型强子对撞机上的轻子-夸克碰撞

Lepton-quark collisions at the Large Hadron Collider

Luca Buonocore, Ulrich Haisch, Paolo Nason, Francesco Tramontano, Giulia Zanderighi

备注：: 7 pages, 4 figures, v2: extended version of the manuscript that has been accepted for publication by PRL
DOI：: 10.1103/PhysRevLett.125.231804

摘要：

在大型强子对撞机（LHC）中通常研究的过程是由LHC光束中质子内部的夸克和胶子引起的。在这封信中，我们证明，由于质子也包含轻子，它是可能的目标轻子诱导的过程在大型强子对撞机以及。特别地，通过从一束光中拾取轻子，从另一束光中拾取夸克，我们首次全面分析了强子对撞机共振单轻子夸克（LQ）的产生。在最小标量LQs的情况下，我们得到新的界限，从大型强子对撞机运行II考虑所有可能的味道组合的电子或μ子和一个向上（$u$），向下（$d$），一个奇怪的或魅力夸克。对于具有$u$或$d$夸克的风味组合，所获得的极限代表了迄今为止对这种类型的LQ的最严格的约束。我们的方法在未来的LHC运行的前景进行了探讨。考虑到拟议的LQ签名的发现范围，我们认为，在具有单个轻轻子和单个光味喷流的最终状态下的专用共振搜索应该添加到ATLAS和CMS合作的异国情调搜索佳能。

英文摘要：

Processes commonly studied at the Large Hadron Collider (LHC) are induced by quarks and gluons inside the protons of the LHC beams. In this letter we demonstrate that, since protons also contain leptons, it is possible to target lepton-induced processes at the LHC as well. In particular, by picking a lepton from one beam and a quark from the other beam, we present for the first time a comprehensive analysis of resonant single leptoquark (LQ) production at a hadron collider. In the case of minimal scalar LQs, we derive novel bounds that arise from the LHC Run II considering all possible flavour combinations of an electron or a muon and an up ($u$), a down ($d$), a strange or a charm quark. For the flavour combinations with a $u$ or a $d$ quark, the obtained limits represent the most stringent constraints to date on LQs of this type. The prospects of our method at future LHC runs are also explored. Given the discovery reach of the proposed LQ signature, we argue that dedicated resonance searches in final states featuring a single light lepton and a single light-flavour jet should be added to the exotics search canon of both the ATLAS and the CMS collaboration.

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