Mass Measurement in Boosted Decay Chains with Missing Energy

TL;DR

This paper introduces a new mass reconstruction technique for collider events with missing energy, leveraging collinearity in boosted decay chains to improve the measurement of exotic particle masses.

Contribution

It presents a novel collinear approximation method for mass reconstruction in boosted decay chains with missing energy at hadron colliders.

Findings

Effective mass reconstruction in simulated boosted decay events.

Improved accuracy over traditional methods in specific kinematic regimes.

Potential application to new physics searches at colliders.

Abstract

We explore a novel method of mass reconstruction in events with missing transverse momentum at hadron colliders. In events with sizeable boost factors in the final steps of dual multi-stage decay chains, the missing energy particles may each be approximately collinear with a visible standard model particle, spanning a narrow "MET-cone." We exploit this collinear approximation, when applicable, to reconstruct the masses of exotica.