Minimum Bias Triggers at ATLAS, LHC

Details Minimum Bias Triggers at ATLAS, LHC Minimum Bias Triggers at ATLAS, LHC

2008-12-02

arxiv.org/abs/0812.0613v1

Physics

High Energy Physics

High Energy Physics - Experiment

3 pages, 4 figures, poster proceedings for ICHEP 2008

Scientific paper

In the first phase of LHC data-taking ATLAS will measure the charged-particle density at the initial center-of-mass energy of 10 TeV and then at 14 TeV. This will allow us improve our knowledge of soft QCD models and pin-down cross-sections of different classes of inelastic collisions at LHC energies. In particular, the dominant non-diffractive interaction is a key process to understanding QCD backgrounds when we reach higher luminosities. We highlight two minimum-bias triggers, sensitive to particles in complementary ranges in pseudo-rapidity, one based on signals from the Inner Detector, the other explicitly designed to trigger on inelastic processes. Studies of their trigger efficiencies as well as possible trigger biases are presented.

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