Reconstructing the heavy resonance at hadron colliders

TL;DR

This paper presents a method using the MAOS approximation to reconstruct the invariant mass of heavy resonances at hadron colliders, providing a model-independent way to identify new particles and measure their masses.

Contribution

It introduces a flexible MAOS-based invariant mass reconstruction technique that reliably peaks at the resonance mass, independent of the specific decay scheme.

Findings

MAOS invariant mass peaks at the resonance mass

Method is effective across different MAOS schemes

Provides a model-independent approach for new particle detection

Abstract

We investigate the method for constructing the invariant mass using the M_T2-assisted on-shell (MAOS) approximation to the invisible particle momenta in the cascade decays of a new particle resonance produced at hadron colliders. We note that the MAOS reconstruction can be defined in several different ways, while keeping the efficiency of approximation at a similar level, and one of them provides a unique solution for each event. It is shown that the invariant mass distribution constructed with the MAOS momenta exhibits a peak at the heavy resonance mass, regardless of the chosen MAOS scheme and the detailed mass spectrum of the particles in the cascade. We stress that the MAOS invariant mass can be used as a clean signal of new particle resonance produced at the LHC, as well as a model-independent method to measure the masses of new particles involved in the event.