What is soft-QCD? - High Energy Physics

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Minimum bias measurements Minimum bias adj. experimental term, to select events with the minimum possible requirements that ensure an inelastic collision occurred. – Exact definition depends on detector (and analysis) – Typically measure kinematics (multiplicity, p T and η spectra, etc) of charged particles in “minimum bias” events using central tracking detectors – Monte Carlo parameters will be tuned to these distributions Charged particles moving through a magnetic field will bend by an amount inversely proportional to p T e.g. ATLAS: (a) At least two charged particles with p T > 100 MeV, |η| < 2.5 (most inclusive) (b) At least six charged particles with p T > 500 MeV, |η| < 2.5 (suppresses diffraction) definition of minimum bias in each analysis Emily Nurse Soft-QCD 16
Measurement philosophy How should you do a measurement that is optimally useful for theory validation and MC tuning? Correct measurements for detector inefficiencies and resolutions (e.g. measure p T spectrum of charged particles, not of ATLAS tracks) No extrapolations into regions not “seen” by ATLAS (such as very low p T or far-forward particles) - We measure what we see, not what the MC tells us we should have seen! No corrections for diffractive events (rather make reproducible cuts that suppress diffraction) Non-Single-Diffractive - On an event-by-event basis we do not know what process occurred Emily Nurse Soft-QCD 17
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: 1. Minimum Bias 2. Underlying Event
Page 19 and 20: Correcting the data • Trigger eff
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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