TUA2C1
EPFL, Lausanne, Switzerland
CERN, Meyrin, Switzerland
CEA, Gif-sur-Yvette, France
PU, Princeton, New Jersey, USA
| Paper | Title | Page |
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TUA2C1 |
Beam-Beam Effects: Modelling, Measurements and Correction Strategy on the Luminosity Calibration Measurements at the Large Hadron Collider Experiments | |
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| At the Large Hadron Collider (LHC), absolute luminosity calibrations obtained by the van der Meer (vdM) method and operational luminosity variations during physics fills are biased by the mutual electromagnetic interaction of the two beams, the beam-beam effects. The colliding bunches experience relative orbit shifts, optical distortions as well as transverse distribution deviations from Gaussians that must be accounted and corrected for when deriving the absolute luminosity scale and when monitoring detector performances during physics runs. In this study the impact of beam-beam effects on the absolute luminosity measurements will be shown by means of numerical simulations, together with the associated systematic uncertainties to the visible cross sections. The biases to the absolute calibrations are also described together with the correction scheme developed and used as part of the detector data analysis. Simulation studies will be compared to data collected during a dedicated experimental study with the CMS, ATLAS and ALICE detectors. Models and experimental data are compared at 1% level, showing an impressive agreement between numerical expectations and experimental data. | ||
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Slides TUA2C1 [3.967 MB] | |
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