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SUMMARY:No Time to Be Transverse: Probing Electroweak Symmetry Breaking wi
 th Longitudinal Weak Bosons at ATLAS
DTSTART:20260728T090000Z
DTEND:20260728T100000Z
DTSTAMP:20260910T102300Z
UID:indico-event-1711686@indico.cern.ch
CONTACT:ep-seminars.colloquia@cern.ch
DESCRIPTION:Speakers: Lailin Xu (University of Science and  Technology of 
 China (CN))\n\n\n\nThe mechanism of electroweak symmetry breaking (EWSB)\,
  responsible for generating the masses of the W and Z bosons\, also gives 
 rise to their longitudinal polarization states. Measurements of weak-boson
  polarization therefore provide one of the most direct experimental probes
  of the EWSB mechanism and offer powerful sensitivity to physics beyond th
 e Standard Model. Although long considered beyond reach at hadron collider
 s because of the small production rates and the challenge of reconstructin
 g polarization states\, such measurements have recently become possible th
 anks to the large LHC datasets\, advances in machine-learning techniques\,
  and increasingly precise theoretical predictions.\nThis seminar presents 
 two recent ATLAS measurements of weak-boson polarization in diboson produc
 tion\, based on the full Run 2 dataset together with part of the Run 3 dat
 aset\, corresponding to an integrated luminosity of about 300 fb⁻¹. The
  first targets the simultaneous production of two longitudinally polarized
  Z bosons\, while the second probes the longitudinal component of the Z bo
 son in electroweak WZjj production. Both analyses exploit the clean lepton
 ic decays of the gauge bosons into electrons and muons and employ machine-
 learning techniques to maximize sensitivity. The resulting polarization fr
 actions and fiducial cross sections are compared with state-of-the-art Sta
 ndard Model predictions\, highlighting the growing power of weak-boson pol
 arization as a precision probe of the electroweak sector.\n \n\n\n \nCof
 fee will be served at 10h30\n \n\nhttps://indico.cern.ch/event/1711686/\n
 \nZoom: https://cern.zoom.us/j/65042463340?pwd=uWAZvSrxYvA8DqbcoHK0xBVY4Gr
 kPs.1
LOCATION:503/1-001 - Council Chamber (CERN)
URL:https://indico.cern.ch/event/1711686/
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