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High Energy Physics Seminar

Monday, February 27, 2023
4:00pm to 5:00pm
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Online and In-Person Event
SMEFT, loops and all that
Michael Trott, Neils Bohr Institute and Caltech,

The modern interpretation of collider data in effective field theory is usually done in
the Standard Model Effective Field Theory (SMEFT). This theory can be systematically improved
with loop corrections, and higher dimensional operators at dimension six, eight etc. It is important to carry out the procedure
of systematically improving the SMEFT description of some processes, to match the sensitivity of experimental results
now, and in the future. This enables interpretations of joint data sets with hierarchies of sensitivity
to be meaningfully combined in a global SMEFT interpretation.

In this talk I will:

1) introduce the SMEFT physics program,
2) explain how this connects to recent insights on using geometric field space approaches in particle physics,
3) directly address some standard arguments against this approach (regarding there being too many unknown parameters,
for this approach to be meaningful, etc) and
4) show some of the most precise theoretical results in this framework for the processes gg-> h and h-> gam gam,
including dimension eight and full two loop QCD interference corrections in the Background Field Method.
The later result for gg-> h is a remarkably compact expression that will be presented.The talk is in 469 Lauritsen.

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