StandardModelCSCResultsQCD

Introduction

This page provides information and plots for QCD studies from ATLAS CSC book, as published in: Expected Performance of the ATLAS Experiment, Detector, Trigger and Physics, The ATLAS Collaboration, CERN-OPEN-2008-020, Geneva, 2008.

A Study of Minimum Bias Events

Find below the plots from the note A study of minimum bias events which is part of the ATLAS CSC book and can be used in public presentations by ATLAS members. More details can be found in the note itself.

Fig1: Central charged particle density for non-single diffractive inelastic events as a function of energy. The lines show predictions from PYTHIA using the ATLAS tune and CDF tune-A, and from PHOJET. The data points are from UA5 and CDF ppbar data.

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Fig2: Pseudorapidity (a) and transverse momentum distribution (b) of stable charged particles from simulated 14TeV pp inelastic collisions generated using PYTHIA and PHOJET event generators.

Fig3: Minimum bias trigger slice.

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Fig4: Trigger efficiency as a function of the number of pixel spacepoints (a) and the number of SCT spacepoints (b).

Fig5: Trigger efficiency as a function of the number of reconstructed tracks for events satisfying the L2 spacepoint requirement.

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Fig6: MBTS L1 trigger threshold scans for the two trigger configurations: (a) MBTS11 (b) and MBTS2.

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Fig7: The track-to-particle correction C_{trk} as a function of (a) \eta and (b) \pt.

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Fig8: The event-level vertex correction as a function of (a) v_z and (b) the number of reconstructed tracks (N).

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Fig9: The track-level vertex correction as a function of (a) v_z and (b) pt .

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Fig10: The event-level trigger bias correction for the NSD sample as a function of (a) v_z and (b) number of reconstructed tracks (N ).

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Fig11: The track-level trigger bias correction for the NSD sample as a function of (a) v_z and (b) pt.

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Fig12: Corrected normalised pseudorapidity and \pt~distributions, together with the input Monte Carlo truth (full line) for the MB sample (blue triangles). (a) \eta distributions for pt>150 MeV, where the lower part, the ratio of the analysis result over the Monte Carlo prediction is shown. The corresponding scale is drawn on the right axis. (b) pt spectra for |\eta|<2.5.

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Fig13: Corrected normalised pseudorapidity and \pt~distributions, together with the input Monte Carlo Truth (full line) for the NSD sample (blue triangles). (a) \eta distributions for pt>150 MeV, where the lower part, the ratio of the analysis result over the Monte Carlo prediction is shown. The corresponding scale is drawn on the right axis. (b) pt spectra for |\eta|<2.5.

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