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SUMMARY:Charting the Unseen: From Precision Top Measurements to Global SME
 FT Fits at ATLAS
DTSTART:20261117T100000Z
DTEND:20261117T110000Z
DTSTAMP:20261112T152400Z
UID:indico-event-1751601@indico.cern.ch
CONTACT:ep-seminars.colloquia@cern.ch
DESCRIPTION:Speakers: Thomas James Stevenson (University of Sussex (GB))\n
 \n\nNew physics may be hiding in plain sight\, leaving subtle deviations f
 rom Standard Model predictions across a broad range of processes rather th
 an a striking signal in any single measurement. The Standard Model Effecti
 ve Field Theory (SMEFT) provides a powerful framework to search for such e
 ffects in a model-agnostic way. Since different processes can probe the sa
 me underlying interactions\, combining measurements is essential to disent
 angle their contributions\, resolve degeneracies\, and maximise sensitivit
 y to physics beyond the Standard Model.\nThis seminar presents different e
 xperimental approaches to this powerful framework.  A recent ATLAS measur
 ement using the associated production of top-quark events with bosons or o
 ther top quarks compares two different strategies: one based on isolating 
 specific Standard Model processes\, and a signature-based strategy where f
 inal states with different reconstructed physics objects are isolated. Add
 itionally\, a global SMEFT analysis using large datasets of Standard Model
  processes involving Higgs-boson\, vector-boson\, and top-quark production
  events\, as well as electroweak precision LEP data is also presented.\nTh
 ese results\, based on the full Run 2 dataset\, illustrate how complementa
 ry analysis strategies and the combination of diverse measurements can sha
 rpen our sensitivity to new interactions and reveal correlations that woul
 d otherwise remain hidden. They also lay the groundwork for an increasingl
 y comprehensive exploration of the SMEFT landscape with Run 3 data and bey
 ond.\n \n\n \nCoffee will be served at 10h30\n \n\nhttps://indico.cern.
 ch/event/1751601/\n\nZoom: https://cern.zoom.us/j/67447396511?pwd=Qld6REnB
 hEIQXzwdyburRoZZVoapoe.1
LOCATION:222/R-001 (CERN)
URL:https://indico.cern.ch/event/1751601/
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