Reference cross section measurements with ALICE in pp and Pb-Pb collisions at LHC

Abstract

Cross sections of reference trigger processes were obtained based on beam property measurements in dedicated luminosity calibration experiments (van der Meer scans). These cross-sections are essential for absolute cross section determinations of physics processes. The reference cross sections are presented for pp collisions at two center of mass energies; 2.76 TeV and 7 TeV, and for Pb-Pb collisions at 2.76 TeV together with a discussion of the systematic uncertainty originating from beam intensity and rate measurement uncertainties.

An updated version of proceedings contribution for workshop "LHC Lumi Days 2012", 29 Feb. (2012) at CERN. 11 pages, 8 figures

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