A New Method for Resolving Combinatorial Ambiguities at Hadron Colliders

TL;DR

This paper introduces a novel method for resolving combinatorial ambiguities in multi-particle decay chains at hadron colliders, significantly improving signal retention over traditional methods by using selection cuts based on transverse momentum and invariant mass.

Contribution

The paper proposes a new approach that outperforms traditional hemisphere methods in resolving decay chain ambiguities at hadron colliders.

Findings

Signal retention increased by up to a factor of 2.

Method effectively reduces combinatorial ambiguities.

Superior performance for a broad class of decay chains.

Abstract

We present a new method for resolving combinatorial ambiguities that arise in multi-particle decay chains at hadron colliders where the assignment of visible particles to the different decay chains has ambiguities. Our method, based on selection cuts favoring high transverse momentum and low invariant mass pairings, is shown to be significantly superior to the more traditional hemisphere method for a large class of decay chains, producing an increase in signal retention of up to a factor of 2. This new method can thus greatly reduce the combinatorial ambiguities of decay chain assignments.