Underlying events in p+p collisions at LHC energies

TL;DR

This paper investigates the properties of hadron production outside jet cones in proton-proton collisions at LHC energies, introducing new methods to analyze underlying events and comparing results with existing techniques.

Contribution

It introduces improved definitions and a novel method for studying underlying events in p+p collisions, enabling detailed analysis of multiple jet events.

Findings

Enhanced understanding of hadron distributions outside jets

Comparison of new and traditional analysis methods

Insights into underlying event characteristics at 7 TeV

Abstract

General properties of hadron production are investigated in proton-proton collisions at LHC energies. We are interested in the characteristics of hadron production outside the identified jet cones. We improve earlier definitions and introduce surrounding rings/belts around the cone of identified jets. In this way even multiple jet events can be studied in details. We define the underlying event as collected hadrons from outside jet cones and outside surrounding belts, and investigate the features of these hadrons. We use a PYTHIA generated data sample of proton-proton collisions at s = (7 TeV)^2. This data sample is analysed by our new method and the widely applied CDF method. Angular correlations and momentum distributions have been studied and the obtained results are compared and discussed.