Underlying Event in pp Collisions at LHC Energies

TL;DR

This paper investigates hadron production in 7 TeV proton-proton collisions at the LHC, introducing new geometrical regions around jets to better understand the underlying event, and compares different methods using PYTHIA simulations.

Contribution

It proposes a new ring/belt method around jets to improve the analysis of underlying events in pp collisions at LHC energies.

Findings

The SB method provides different insights into hadron production outside jets.

Comparison shows the SB approach can refine underlying event characterization.

Results suggest improved modeling of underlying events in PYTHIA simulations.

Abstract

Hadron production is investigated in proton-proton (pp) collisions at \surds = 7 TeV LHC energy - especially outside the cones of identified jets. We improved the original CDF definition of underlying event and introduce surrounding rings/belts (SB) around the cone of identified jets. We compare the characteristics of hadron production using the original CDF-based and the new SB-based via analysing PYTHIA generated fluxes of these hadrons within the geometrical regions of pp collisions.