Speaker
Daniel Wiegand
(University of Pittsburgh)
Description
Standard Model Effective Theory (SMEFT) is a powerful tool to constrain new physics in a rather model-independent way. A lot of work has been done to constrain the army of dimension-six operators at next-to-leading order but a rather important subset - four-fermi operators - has been neglected so far. We derive and put into perspective the bounds from the W-polarization fractions associated with top quark decay and Z decay partial widths as well as the weak mixing angle. On the technical side we work out the often neglected subtleties when treating chiral interactions in dimensional regularization.
Author
Daniel Wiegand
(University of Pittsburgh)
