The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment
High Energy Physics - Experiment
2019-11-01 v1
Abstract
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.
Keywords
Cite
@article{arxiv.1910.14066,
title = {The factorization bias in the Van der Meer method: Run 2 experiences at the CMS experiment},
author = {Joscha Knolle},
journal= {arXiv preprint arXiv:1910.14066},
year = {2019}
}
Comments
Presented at the LHC Lumi Days 2019, Pr\'evessin, France, June 04-05, 2019