Distinguishing Standard Model Extensions using Monotop Chirality at the LHC

TL;DR

This paper proposes minimal Standard Model extensions involving heavy scalars and a Majorana fermion, predicting monotop events at the LHC, and demonstrates how top quark chirality can be used to distinguish these models through detailed simulations.

Contribution

It introduces two minimal SM extensions with unique collider signatures and provides a method to determine the chiral nature of interactions via top quark polarization analysis.

Findings

Top quark chirality can be distinguished in LHC events.

Simulations show clear differences in decay spectra for polarized top quarks.

Models predict distinctive monotop signals at the LHC.

Abstract

We present two minimal extensions of the standard model, each giving rise to baryogenesis. They include heavy color-triplet scalars interacting with a light Majorana fermion that can be the dark matter (DM) candidate. The electroweak charges of the new scalars govern their couplings to quarks of different chirality, which leads to different collider signals. These models predict monotop events at the LHC and the energy spectrum of decay products of highly polarized top quarks can be used to establish the chiral nature of the interactions involving the heavy scalars and the DM. Detailed simulation of signal and standard model background events is performed, showing that top quark chirality can be distinguished in hadronic and leptonic decays of the top quarks.