Tau lepton reconstruction at collider experiments using impact parameters

TL;DR

This paper introduces a new method for reconstructing tau lepton pairs at collider experiments that leverages impact parameters and vertex information, improving accuracy without relying on invariant mass assumptions.

Contribution

The paper presents a novel tau reconstruction technique that does not depend on invariant mass assumptions and is robust against momentum loss along the beam axis.

Findings

Effective reconstruction of tau pairs demonstrated in simulated e+e- events.

Method is insensitive to momentum loss along the beam direction.

Applicable to collider experiments with precise vertex and decay product measurements.

Abstract

We present a novel method for the reconstruction of events containing pairs of hadronically decaying tau leptons at collider experiments. This method relies on accurate knowledge of the tau production vertex and precise measurement of its charged decay products. The method makes no assumptions about the centre-of-mass or invariant mass of the tau pair, and is insensitive to momentum loss along the beam direction. We demonstrate the method using e+e- -> mu+ mu- tau+ tau- events fully simulated in the ILD detector.