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DTSTART;TZID=America/Los_Angeles:20181023T160000
DTEND;TZID=America/Los_Angeles:20181023T170000
DTSTAMP:20260413T135352
CREATED:20180917T145120Z
LAST-MODIFIED:20180917T145120Z
UID:911-1540310400-1540314000@rpm.physics.lbl.gov
SUMMARY:Matthias Neubert (U. Mainz) "Effective Field Theory after a New-Physics Discovery"
DESCRIPTION:ABSTRACT: \n\nWhen a new heavy particle is discovered at the LHC\, it will be interesting to study its decays into Standard Model particles using an effective field-theory framework. We point out that the proper effective theory must be based on non-local operators defined in soft-collinear effective theory (SCET). For the interesting case where the new resonance is a gauge-singlet spin-0 boson\, which is the first member of a new sector governed by a mass scale M\, we show how a consistent scale separation between M and the electroweak scale v is achieved up to next-to-next-to-leading order in \lambda~v/M. The Wilson coefficients in the effective Lagrangian depend in a non-trivial way on the mass of the new resonance and the masses of yet undiscovered heavy particles. Large logarithms of the ratio M/v can be systematically resummed using the renormalization group. We develop a SCET toolbox\, with which it is straightforward to construct the relevant effective Lagrangians for new heavy particles with other charges and spin.
URL:https://rpm.physics.lbl.gov/event/matthias-neube-u-mainz-tba/
LOCATION:HYBRID 50A-5132 (Sessler Conference Room)\, https://lbnl.zoom.us/j/91782268585\, 50A-5132
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