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SUMMARY:The Standard Model as an Effective Field Theory - Tevong You (King
 's College London)
DTSTART:20150508T150000Z
DTEND:20150508T160000Z
UID:TALK59175@talks.cam.ac.uk
CONTACT:Damien George
DESCRIPTION:Particle physics in the last century can be described as a ser
 ies of effective theories\, each predicting its own range of validity beyo
 nd which a more fundamental theory must take over. This program culminated
  in the Standard Model (SM)\, with all its constituent particles now exper
 imentally established following the 2012 discovery of a Higgs boson. The S
 M is a renormalizable theory valid to arbitrarily high scales but there is
  evidence new degrees of freedom must exist. If this new physics is decoup
 led at higher energies\, as suggested by null experimental searches so far
 \, then the SM must also be considered as an effective field theory with h
 igher-dimensional operators suppressed by a cut-off scale. The sensitivity
  to this scale is quantified by the effects of operator coefficients on Hi
 ggs physics\, triple-gauge couplings\, and electroweak precision tests. Li
 mits on these Wilson coefficients can be translated to a particular UV the
 ory by integrating out heavy particles. As an example we illustrate this f
 or a stop in the MSSM using the path integral method to obtain the one-loo
 p effective Lagrangian. A universality in the result facilitates matching 
 to any other model.
LOCATION:Seminar Room B\, Rutherford Building\, Cavendish Laboratory
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