Precision luminosity measurements at LHCb
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
Measuring cross-sections at the LHC requires the luminosity to be determined accu rately 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 8TeV (proton-proton collisions) and for √sNN = 5TeV (proton-lead collisions). Both the “van der Meer scan” and “beam-gas imaging” luminosity calibration methods were employed. It is ob served 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 = 8TeV 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.
improves significantly the consistency of the results. For proton-proton interactions at √s = 8TeV 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.
Date Issued
2014-12-01
Date Acceptance
2014-11-11
Citation
Journal of Instrumentation, 2014, 9
ISSN
1748-0221
Publisher
IOP Publishing
Journal / Book Title
Journal of Instrumentation
Volume
9
Copyright Statement
© CERN 2014 for the benefit of the LHCb collaboration, published under the terms of the Creative Commons Attribution 3.0 License by IOP Publishing Ltd and Sissa Medialab srl. Any further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation and DOI.
License URL
Identifier
https://www.webofscience.com/api/gateway?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000345859200021&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=a2bf6146997ec60c407a63945d4e92bb
Subjects
Instrumentation for particle accelerators and storage rings - high energy (linear accelerators, synchrotrons)
Instruments & Instrumentation
Pattern recognition, cluster finding, calibration and fitting methods
Science & Technology
Technology
Publication Status
Published
Article Number
P12005
Date Publish Online
2014-12-05