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SUMMARY:Jonathan Hermann - The impact of top-quark modelling on the exclus
 ion limits in tt+DM searches at the LHC - Jonathan Hermann (RWTH Aachen)
DTSTART:20220225T160000Z
DTEND:20220225T170000Z
UID:TALK168275@talks.cam.ac.uk
CONTACT:Rene Poncelet
DESCRIPTION:*The seminar will take place via Zoom "here":https://maths-cam
 -ac-uk.zoom.us/j/95215212460?pwd=TWN5cjJ3azErSUYremw5UWRKL0NKUT09.*\n\nAbs
 tract: In this talk\, I will demonstrate the importance of properly modell
 ing Standard Model backgrounds in tt-associated Dark Matter production. Sp
 ecifically\, I will discuss higher-order corrections and off-shell effects
  for the two dominant background processes tt and ttZ in the presence of e
 xtremely exclusive cuts. I will present exclusion limits for state-of-the-
 art NLO full off-shell tt and ttZ predictions and compare those to limits 
 computed with backgrounds in the NWA and / or at LO.\n\nIn addition\, seve
 ral new-physics sensitive observables will be compared to decide which obs
 ervables should be used to obtain the most stringent limits and the effect
 s of the central scale choice and integrated luminosity on the exclusion l
 imits will be assessed.
LOCATION:Potter Room (B1.19)
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