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SUMMARY:Precision at Peak Performance: CMS Delivers the Most Precise Lumin
 osity Measurement at any bunched-beam hadron collider - Dr. Christopher Pa
 lmer\, University of Maryland
DTSTART:20251007T100000Z
DTEND:20251007T110000Z
UID:TALK236056@talks.cam.ac.uk
CONTACT:Dr. Aashaq Shah
DESCRIPTION:Luminosity measurements are foundational elements of\ncollider
  physics measurements and searches. Its precise determination is essential
  for accurate cross-section measurements and new physics searches. In this
  talk\, the most precise luminosity measurement ever\nachieved at a bunche
 d-beam hadron collider\, based on data collected by\nthe CMS experiment du
 ring the LHC Run 2 (2015-2018) at sqrt(s) = 13\nTeV. Leveraging van der Me
 er scans\, advanced extrapolation techniques\,\nand a suite of calibrated 
 luminometers\, CMS reached a relative\nuncertainty of 0.82% for 2017 and 0
 .84% for 2018. Combining these\nupdated measurements with the previous 201
 5 and 2016 precision\npublications\, the CMS luminosity for Run 2 data is 
 just 0.73%--a new\nbenchmark in collider performance. We detail the method
 ology behind\nthe beam-separation (van der Meer) scans\, corrections for d
 etector\nnonlinearity and efficiency\, and the use of Z boson rates to cro
 ss\ncheck consistency across multiple data-taking periods. This\nachieveme
 nt not only enhances the precision of CMS physics results but\nalso establ
 ishes a new standard for future luminosity determinations\nat high-energy 
 colliders.
LOCATION:Ray Dolby Center -- Seminar Room: D2.002 
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