Reconstruction of $\tilde{\tau}_{1}$ mass at the LHC

TL;DR

This paper presents a method for reconstructing the lightest stau mass at the LHC using cascade decay analysis, achieving approximately 20% precision with simulated SUSY data.

Contribution

It introduces a cascade mass reconstruction approach assuming known masses of other SUSY particles, applied to simulated LHC data for the first time.

Findings

Reconstructed stau mass with about 20% accuracy.

Used 160k simulated events at 14 TeV for analysis.

Demonstrated feasibility of mass reconstruction with detector simulation.

Abstract

The cascade mass reconstruction approach was used for mass reconstruction of the lightest stau produced at the LHC in the cascade decay $\tilde{g} \to \tilde{b} b \to \tilde{\chi}_{2}^{0} b b \to \tilde{\tau}_{1} \tau b b \to \tilde{\chi}_{1}^{0} \tau \tau b b $. The stau mass was reconstructed assuming that masses of gluino, bottom squark and two lightest neutralinos were reconstructed in advance. SUSY data sample sets for the SU3 model point containing 160k events each were generated which corresponded to an integrated luminosity of about $8 \rm fb^{-1}$ at 14 TeV. These events were passed through the AcerDET detector simulator, which parametrized the response of a generic LHC detector. The mass of the $\tilde{\tau}_{1}$ was reconstructed with a precision of about 20% on average.