Precision luminosity measurements at LHCb
© 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 LHC...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2021
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| Online Access: | https://hdl.handle.net/1721.1/134588 |
| _version_ | 1826188044596674560 |
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| author | The LHCb Collaboration Counts, Ian Thomas Hunt Ilten, Philip J Williams, Michael |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics The LHCb Collaboration Counts, Ian Thomas Hunt Ilten, Philip J Williams, Michael |
| author_sort | The LHCb Collaboration |
| collection | MIT |
| description | © 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. |
| first_indexed | 2024-09-23T07:53:45Z |
| format | Article |
| id | mit-1721.1/134588 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T07:53:45Z |
| publishDate | 2021 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1345882023-01-06T18:20:31Z Precision luminosity measurements at LHCb The LHCb Collaboration Counts, Ian Thomas Hunt Ilten, Philip J Williams, Michael Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science © 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. 2021-10-27T20:05:40Z 2021-10-27T20:05:40Z 2014-12-01 2021-03-26T18:03:55Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134588 Aaij, R., et al. "Precision Luminosity Measurements at Lhcb." Journal of Instrumentation 9 (2014). en 10.1088/1748-0221/9/12/P12005 Journal of Instrumentation Creative Commons Attribution 3.0 unported license https://creativecommons.org/licenses/by/3.0/ application/pdf IOP Publishing IOP Publishing |
| spellingShingle | The LHCb Collaboration Counts, Ian Thomas Hunt Ilten, Philip J Williams, Michael Precision luminosity measurements at LHCb |
| title | Precision luminosity measurements at LHCb |
| title_full | Precision luminosity measurements at LHCb |
| title_fullStr | Precision luminosity measurements at LHCb |
| title_full_unstemmed | Precision luminosity measurements at LHCb |
| title_short | Precision luminosity measurements at LHCb |
| title_sort | precision luminosity measurements at lhcb |
| url | https://hdl.handle.net/1721.1/134588 |
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