Prescise measurement of jet energies with the ZEUS detector

TL;DR

This paper presents a new method for precisely measuring jet energies in the ZEUS detector by combining tracking and calorimeter data, achieving better than 3% uncertainty and improving jet structure analysis.

Contribution

The paper introduces an energy correction technique using Energy Flow Objects that enhances jet energy resolution and kinematic variable accuracy in deep inelastic scattering events.

Findings

Achieved jet energy uncertainty better than 3%.

Improved measurement of jet internal structure.

Validated method on both real and simulated data.

Abstract

A method to correct the jet transverse energy has been developed for the ZEUS detector which attains an uncertainty better than 3%. The procedure is based on a combination of tracking and calorimeter information that optimises the resolution of reconstructed kinematic variables. The selected calorimeter clusters and tracks are referred to as Energy Flow Objects (EFOs). The conservation of energy and momentum in neutral current deep inelastic $e^+p$ scattering events is exploited to determine the required energy corrections by balancing the scattered positron with the hadronic final state. The method has been applied to data and simulated events independently. The corrected EFOs are used as input to a $k_T$-cluster jet algorithm to reconstruct the jets and to determine kinematic variables. In addition, the corrected EFOs allow an improved measurement of the internal structure of a jet.