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UID:cf117f453ac94de3b8e998ff8cd4c44c
DTSTAMP:20260718T191037Z
SUMMARY:HEP seminar: Chris Palmer (Maryland) – Precision at peak performa
 nce: CMS Delivers the Most Precise Luminosity Measurement at any bunched-b
 eam hadron collider
DESCRIPTION:Luminosity measurements are foundational elements of collider p
 hysics measurements and searches. Its precise determination is essential f
 or accurate cross-section measurements and new physics searches. In this t
 alk\, the most precise luminosity measurement ever achieved at a bunched-b
 eam hadron collider\, based on data collected by the CMS experiment during
  the LHC Run 2 (2015-2018) at sqrt(s) = 13 TeV. Leveraging van der Meer sc
 ans\, advanced extrapolation techniques\, and a suite of calibrated lumino
 meters\, CMS reached a relative uncertainty of 0.82% for 2017 and 0.84% fo
 r 2018. Combining these updated measurements with the previous 2015 and 20
 16 precision publications\, the CMS luminosity for Run 2 data is just 0.73
 %–a new benchmark in collider performance. We detail the methodology beh
 ind the beam-separation (van der Meer) scans\, corrections for detector no
 nlinearity and efficiency\, and the use of Z boson rates to cross check co
 nsistency across multiple data-taking periods. This achievement not only e
 nhances the precision of CMS physics results but also establishes a new st
 andard for future luminosity determinations at high-energy colliders.
URL:https://www.imperial.ac.uk/events/199322/hep-seminar-chris-palmer-maryl
 and-precision-at-peak-performance-cms-delivers-the-most-precise-luminosity
 -measurement-at-any-bunched-beam-hadron-collider/
DTSTART;TZID=Europe/London:20251003T133000
DTEND;TZID=Europe/London:20251003T143000
LOCATION:539\, Blackett Building\, South Kensington Campus\, Imperial Colle
 ge London\, London\, SW7 2AZ\, United Kingdom
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