Orateur
Mme
Carolina Gabaldon
(CERN)
Description
The luminosity is measured in ATLAS by several detectors and methods, both online and offline.
This poster will present briefly the luminosity detectors in ATLAS and explain in some detail
how they were used to extract and publish luminosity during the 2010 data taking. One of the
challenges in measuring the luminosity at the LHC comes from the fact that many interactions
typically occur in every bunch crossing. Comparisons of the number of interactions as measured
by different detectors and methods will be presented. The very successful collaboration with the
LHC machine has recently lead to a calibration, via beam separation scans, which is now
estimated to have a systematic error of 3.4% for 2010 and a similar value fopr 2011 is expected.
Since the error in the luminosity analysis was the limiting factor in the precision of many
cross section measurements in ATLAS during 2010, this error analysis will also be discussed in some detail.
Auteur principal
Prof.
Beate Heinemann
(UC Berkeley and Lawrence Berkeley National Lab)
