Early LHC Underlying Event Data - Findings and Surprises

By R. Field. 2010

337 citations recorded by the source corpus.

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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b9daedf1ba9639acd642571cf3c1b2d71ce1b72a

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In Nuclear and High Energy Physics

1. Cms Collaboration
2. The Cms Collaboration
3. Atlas Collaboration
4. M. Raidal
5. Carlo Rovelli
6. Philip C. Harris
7. A. Gritsan
8. Nhan Tran

Citations in the corpus

• Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS (2011, methodology): “22 [22], tune Z2 (the Z2 tune is identical to the Z1 tune described in [23] except that Z2 uses the CTEQ6L PDF, while Z1 uses CTEQ5L) and processed through the CMS detector simulation, based on GEANT4 [24].”
• Performance of the CMS missing transverse momentum reconstruction in pp data at √s = 8 TeV (2014, background): “24 program has been set up with a parameter set description for the underlying event referred to as tune Z2* [16, 17].”
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• Measurement of the inelastic proton-proton cross section at s√=7 TeV (2012, background): “The first group comprises several versions of pythia: pythia 6 (tunes D6T, Z1_LEP [17], AMBT1, DW-Pro, and Pro-PT0 Table 4 List of systematic sources and their effects on the value of the inelastic cross section measured using the vertex-counting method.”
• Measurement of the top quark mass using proton-proton data at √s=7 and 8 TeV (2016, background): “The most recent PYTHIA Z2* tune is derived from the Z1 tune [18], which uses the CTEQ5L parton distribution function (PDF) set, whereas Z2* uses CTEQ6L [19].”
• Measurement of the Inclusive W and Z Production Cross Sections in pp Collisions at sqrt(s) = 7 TeV (2011, methodology): “Samples of EWK processes with Z and W bosons, both for signal and background events, are generated using POWHEG [28– 30] interfaced with the PYTHIA [31] parton-shower generator and the Z2 tune (the PYTHIA6 Z2 tune is identical to the Z1 tune described in [32] except that Z2 uses the CTEQ6L PDF, whil”
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