Author: Dabrowski, A.E.
Paper Title Page
TUA2C1
 Beam-Beam Effects: Modelling, Measurements and Correction Strategy on the Luminosity Calibration Measurements at the Large Hadron Collider Experiments  
 
  • T. Pieloni, J.M. Wańczyk
    EPFL, Lausanne, Switzerland
  • X. Buffat, A.E. Dabrowski, R. Tomás García, J.M. Wańczyk
    CERN, Meyrin, Switzerland
  • W. Kozanecki
    CEA, Gif-sur-Yvette, France
  • D.P. Stickland
    PU, Princeton, New Jersey, USA
  
  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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