Unconventional Searches for Exotic Particles at Future Lepton Colliders

TL;DR

This paper explores the potential of future lepton colliders, like the ILC and Muon Collider, to detect exotic particles predicted by BSM theories, especially those involving multiple BSM particles with distinctive high-multiplicity signatures.

Contribution

It introduces a specific BSM model with a fermionic quintuplet and scalar quartet, highlighting its unique signatures for detection at future lepton colliders.

Findings

Future lepton colliders can detect exotic particles below and above TeV scale.

The proposed model predicts high lepton and jet multiplicity signatures.

Distinctive signals make the model promising for experimental searches.

Abstract

The main aim of the the Large Hadron Collider (LHC) experiments is to search for exotic particles with masses in the TeV range as predicted by Beyond Standard Model (BSM) theories. However, there is no hint of BSM around TeV scale so far. Hence, it is possible that the exotic particles are heavier and larger centre of mass energy is needed to observe them. Alternatively, the future lepton colliders offer a comparatively cleaner environment than the LHC which is advantageous to detect light exotic particles. Lepton colliders, like the International Linear Collider, provide the opportunity to detect exotic particles at energies below the TeV scale. The Muon Collider, once fully operational, will have the capability to observe exotic particles at and beyond the TeV scale. The search for BSM particles typically assumes a minimal scenario where only one type of BSM particle couples with the Standard Model (SM) sector. But there are theories which involve such interactions of multiple BSM particles. Here I discusses a specific model featuring a fermionic quintuplet and a scalar quartet that interact before decaying into SM particles. This model yields distinctive signatures characterized by high lepton and jet multiplicities, making it a promising candidate for detection at future lepton colliders.