What is soft-QCD? - High Energy Physics

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Triggering the events • Measurement performed with early data • Few interactions per crossing (mean ~ 0.007) – ~ No additional interactions – But … 99.3% of beam crossings have no interaction! • Need to “trigger” on inelastic interactions • Use Minimum Bias Trigger Scintillators (very inclusive) Minimum Bias Trigger Scintillator disks trigger on any charged particle with 2.09 < |η| < 3.84 Emily Nurse Soft-QCD 18
Correcting the data • Trigger efficiency from data (small “control” sample recorded with different trigger) • Tracking efficiency from Monte Carlo with GEANT detector simulation (systematic uncertainties determined from checks with data) Emily Nurse Soft-QCD 19
Page 1 and 2: Soft-QCD at Hadron Colliders 1 st N
Page 3 and 4: Hadron colliders : recap LHC: pp @
Page 5 and 6: What is soft-QCD? cross-section for
Page 7 and 8: What is soft-QCD? Soft-QCD processe
Page 9 and 10: Pileup Important for understanding
Page 11 and 12: Soft-QCD models e.g. Pythia QCD 22
Page 13 and 14: Soft-QCD models Matter distribution
Page 15 and 16: 1. Minimum Bias 2. Underlying Event
Page 17: Measurement philosophy How should y
Page 21 and 22: η spectra lower p T particles Emil
Page 23 and 24: Results at 0.9, 2.36 and 7 TeV High
Page 25 and 26: Reminder : Underlying Event Soft-QC
Page 27 and 28: Underlying Event Measurements • H
Page 29 and 30: Underlying Event Measurements Emily
Page 31 and 32: Underlying Event Measurements Incon
Page 33 and 34: Double parton scattering The high p
Page 35 and 36: Inelastic cross-section measurement
Page 37 and 38: Gap cross-section • Diffractive e
Page 39 and 40: Other diffractive processes Not rea
Page 41 and 42: Two particle correlations R(Δη,Δ

What is soft-QCD? - High Energy Physics

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