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SUMMARY:Putting SMEFT Fits to Work: Lessons from Matching Simple Models - 
 Sam Homiller (Harvard)
DTSTART:20220513T150000Z
DTEND:20220513T160000Z
UID:TALK173243@talks.cam.ac.uk
CONTACT:Maeve Madigan
DESCRIPTION:The Standard Model Effective Field Theory (SMEFT) has become t
 he preferred tool for parameterizing potential beyond the Standard Model p
 hysics effects in precision measurements at the LHC. While the observation
  of a nonzero operator coefficient in the SMEFT would be a clear sign of n
 ew physics\, gleaning information about the nature of the underlying model
  at the high scale presents a number of challenges. In this talk\, I will 
 discuss recent progress in using SMEFT fits to LHC and electroweak precisi
 on data to constrain the parameters of simple extensions of the Standard M
 odel\, focusing in particular on the examples of a singlet scalar\, a righ
 t-handed top partner\, and a 2HDM. Focusing on these simple extensions all
 ows us to study the process of extracting limits from SMEFT fits in detail
 \, including the effects of running between the matching scale and the wea
 k scale\, the impact of one loop matching contributions\, and the relative
  importance of dimension-8 operators. Including dimension-8 operators high
 lights interesting subtleties in the matching procedure that can affect th
 e interpretation of SMEFT fit results. 
LOCATION:Potter Room (B1.19)
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