Description:

LHC, besides its amazing success in confirming our Standard Model predictions, has (so far) not delivered any direct evidence of Physics beyond the Standard Model. Part of the LHC legacy will be to put the collected data into perspective and efficiently constrain new physics 

The Standard Model Effective Theory (SMEFT) is the appropriate tool for analyzing the data and constraining new Physics in a model independent way. I will give a general introduction to the philosophy and toolkit of SMEFT, specifically with attention to how higher-order corrections are incorporated into the framework. Going beyond leading order is often necessary, not only to increase the precision of the bounds but also to access operators that are not present in a leading-order analysis.

As concrete examples I will present a recent project (arXiv 1907.00997) in which we investigated the bounds derived from top quark decay. This served as an opportunity to clear out the subtleties associated with chirality and the treatment of \gamma_5 that arise when performing one-loop SMEFT calculations in dimensional regularization.​

Seminar Speaker: Daniel Wiegand, Northwestern

Keywords: Physics, Astronomy, HEP