Abstract
In 2013, the Large Hadron Collider provided proton-lead and lead-proton collisions at the center-of-mass energy per nucleon pair √sNN=5.02 TeV . Van der Meer scans were performed for both configurations of colliding beams, and the cross section was measured for two reference processes, based on particle detection by the T0 and V0 detectors, with pseudo-rapidity coverage 4.6 < η < 4.9, -3.3 < η < -3.0 and 2.8 < η < 5.1, -3.7 < η < -1.7, respectively. Given the asymmetric detector acceptance, the cross section was measured separately for the two configurations. The measured visible cross sections are used to calculate the integrated luminosity of the proton-lead and lead-proton data samples, and to indirectly measure the cross section for a third, configuration-independent, reference process, based on neutron detection by the Zero Degree Calorimeters.
Highlights
Can be used, as well as numerical integration of the curve
Van der Meer scans were performed for both configurations of colliding beams, and the cross section was measured for two reference processes
The cross section was measured for two reference processes: one is based on the V0 detector, the other on the T0 detector
Summary
At the ALICE experiment, two vdM-scan sessions were carried out during the 2013 proton-lead data-taking campaign at the LHC. A similar trigger condition defines the T0-based reference process, with the additional condition that the longitudinal coordinate of the interaction vertex, evaluated by the trigger electronics via the difference of arrival times in the two arrays (measured with a resolution of 20 ps), lies in the range |z| < 30 cm (where z = 0 is the nominal IP2 position). This online cut aims to reject the background from beam-gas and beam-satellite interactions. This correction is implemented by multiplying the N1N2 product by both the ghost- and satellite-charge factors
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