Min-Bias and the Underlying Event at the LHC

Details Min-Bias and the Underlying Event at the LHC Min-Bias and the Underlying Event at the LHC

2011-10-25

arxiv.org/abs/1110.5530v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Lectures presented at the 51st Cracow School of Theoretical Physics: "The Soft Side of the LHC"

Scientific paper

In a very short time the experiments at the LHC have collected a large amount of data that can be used to study minimum bias (MB) collisions and the underlying event (UE) in great detail. The CDF PYTHIA 6.2 Tune DW predictions for the LHC 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 LHC PYTHIA 6.4 Tune Z1 does an excellent job describing the LHC UE data. The modeling of MB (i.e. the overall inelastic cross section) is more complicated because one must include a model of diffraction. The ability of PYTHIA Tune DW and Tune Z1 to simultaneously describe both the UE in a hard scattering process and MB collisions are studied. No model describes perfectly all the features of MB collisions at the LHC.

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