Precision luminosity measurements at LHCb
Name
The_LHCb_collaboration_2014_J._Inst._9_P12005.pdf
Description
Published version
Size
5.48 MB
Format
Adobe PDF
Checksum (MD5)
939e87be0ad00e943e18cfda8435ceeb
Author(s)
The LHCb Collaboration
Counts, Ian Thomas Hunt
Ilten, Philip J
Williams, Michael
Date Issued
December 1, 2014
Journal
Journal of Instrumentation
Publisher
IOP Publishing
Citation
Aaij, R., et al. "Precision Luminosity Measurements at Lhcb." Journal of Instrumentation 9 (2014).
Version
Final published version
Abstract
© CERN 2014 for the benefit of the LHCb collaboration.. Measuring cross-sections at the LHC requires the luminosity to be determined accurately at each centre-of-mass energy s. In this paper results are reported from the luminosity calibrations carried out at the LHC interaction point 8 with the LHCb detector for s = 2.76, 7 and 8 TeV (proton-proton collisions) and for sNN = 5 TeV (proton-lead collisions). Both the "van der Meer scan" and "beam-gas imaging" luminosity calibration methods were employed. It is observed that the beam density profile cannot always be described by a function that is factorizable in the two transverse coordinates. The introduction of a two-dimensional description of the beams improves significantly the consistency of the results. For proton-proton interactions at s = 8 TeV a relative precision of the luminosity calibration of 1.47% is obtained using van der Meer scans and 1.43% using beam-gas imaging, resulting in a combined precision of 1.12%. Applying the calibration to the full data set determines the luminosity with a precision of 1.16%. This represents the most precise luminosity measurement achieved so far at a bunched-beam hadron collider.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 3.0 unported license
Persistent DSpace Link
DOI of Published Version
10.1088/1748-0221/9/12/P12005
https://doi.org/10.1088/1748-0221/9/12/P12005
