Asymmetric Leptoquark Pair Production at LHC

TL;DR

This paper explores a novel asymmetric leptoquark pair production mechanism at the LHC, highlighting its unique features, conditions for occurrence, and implications for constraining leptoquark models using existing search results.

Contribution

It introduces the concept of asymmetric leptoquark pair production, details conditions for its occurrence, and reinterprets existing experimental results within this framework.

Findings

Identifies conditions for asymmetric leptoquark pair production.

Reinterprets LHC search results considering asymmetric production.

Provides updated parameter space constraints for specific leptoquark models.

Abstract

We investigate asymmetric leptoquark pair production mechanism at the Large Hadron Collider to advocate its potential relevance to establish reliable constraints on the leptoquark parameter space and its ability to aid in correct identification of these attractive sources of new physics. The main feature of asymmetric pair production that genuinely distinguishes it from the usual leptoquark pair production is given by the fact that the two leptoquarks that are produced in proton-proton collisions through a $t$-channel lepton exchange are not charge conjugates of each other. Hence the proposed name of asymmetric leptoquark pair production for this type of process. We spell out prerequisite conditions for the asymmetric leptoquark pair production mechanism to be operational and enumerate all possible combinations of leptoquark multiplets that can potentially generate it. We finally reinterpret existing leptoquark pair production search results within several simple scalar leptoquark extensions of the Standard Model, assuming that the leptoquarks exclusively couple to either electrons or muons and the first generation quarks, to demonstrate proper inclusion of asymmetric pair production. We consequently present accurate parameter space constraints for the $S_1$, $S_3$, $R_2$, $S_1$+$S_3$, and $S_1$+$R_2$ leptoquark scenarios.