Early LHC Underlying Event Data - Findings and Surprises
Rick Field

TL;DR
This paper evaluates PYTHIA tunes against early LHC underlying event data, finding improved descriptions with Tune Z1 but highlighting persistent challenges in modeling minimum-bias events.
Contribution
It provides a detailed comparison of PYTHIA 6.2 and 6.4 tunes against LHC data, revealing strengths and limitations in current event modeling.
Findings
PYTHIA 6.4 Tune Z1 better describes UE data than 6.2
Models struggle to accurately predict min-bias features at LHC energies
Underlying event behavior aligns roughly with expectations
Abstract
The CDF PYTHIA 6.2 Tune DW predictions of the LHC underlying event (UE) data at 900 GeV and 7 TeV are examined in detail. The behavior of the UE at the LHC is roughly what we expected. The new LHC PYTHIA 6.4 Tune Z1 does an even better job describing the UE data at 900 GeV and 7 TeV. However, the modeling of "min-bias" at the LHC (i.e. the overall inelastic cross section) is a very different story. No model describes all the features of "min-bias" collisions at 900 GeV and 7 TeV.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · High-Energy Particle Collisions Research · Quantum Chromodynamics and Particle Interactions
