The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment

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The luminosity measurement of the CMS experiment at the CERN LHC is calibrated with Van der Meer (VdM) scans. A bias occurs in the VdM method due to the assumption of transversely factorizable proton densities of the LHC beams. Here, the different methods applied in Run 2 to estimate the size of the...

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Detalles Bibliográficos
Autor principal: Knolle, Joscha
Lenguaje:eng
Publicado: 2019
Materias:
Detectors and Experimental Techniques
Acceso en línea:http://cds.cern.ch/record/2715626
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author Knolle, Joscha
author_facet Knolle, Joscha
author_sort Knolle, Joscha
collection CERN
description The luminosity measurement of the CMS experiment at the CERN LHC is calibrated with Van der Meer (VdM) scans. A bias occurs in the VdM method due to the assumption of transversely factorizable proton densities of the LHC beams. Here, the different methods applied in Run 2 to estimate the size of the factorization bias are reported. The beam-imaging method reconstructs the transverse proton densities from beam-imaging scans. Additional methods exploit offset scans, analyze the evolution of the measured luminous region, and evaluate diagonal scans.
id cern-2715626
institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2019
record_format invenio
spelling cern-27156262020-04-20T20:01:30Zhttp://cds.cern.ch/record/2715626engKnolle, JoschaThe factorization bias in the Van der Meer method: Run 2 experiences at the CMS experimentDetectors and Experimental TechniquesThe luminosity measurement of the CMS experiment at the CERN LHC is calibrated with Van der Meer (VdM) scans. A bias occurs in the VdM method due to the assumption of transversely factorizable proton densities of the LHC beams. Here, the different methods applied in Run 2 to estimate the size of the factorization bias are reported. The beam-imaging method reconstructs the transverse proton densities from beam-imaging scans. Additional methods exploit offset scans, analyze the evolution of the measured luminous region, and evaluate diagonal scans.CMS-CR-2019-129oai:cds.cern.ch:27156262019-09-04
spellingShingle Detectors and Experimental Techniques
Knolle, Joscha
The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment
title The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment
title_full The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment
title_fullStr The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment
title_full_unstemmed The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment
title_short The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment
title_sort factorization bias in the van der meer method: run 2 experiences at the cms experiment
topic Detectors and Experimental Techniques
url http://cds.cern.ch/record/2715626
work_keys_str_mv AT knollejoscha thefactorizationbiasinthevandermeermethodrun2experiencesatthecmsexperiment
AT knollejoscha factorizationbiasinthevandermeermethodrun2experiencesatthecmsexperiment

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