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DTSTART;TZID=America/Chicago:20261113T110000
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DTSTAMP:20261113T145051Z
SUMMARY:Special A&I Colloquium\, Jonah Berean-Dutcher: Soft theorems: from higher symmetry to effective field theory
UID:648126@northwestern.edu
TZID:America/Chicago
DESCRIPTION: I will discuss recently derived soft theorems obeyed by scattering amplitudes. For scattering amplitudes involving a class of Goldstone bosons\, such as pions\, a generalized double-soft theorem is obeyed when the associated quantum field theory possesses a spontaneously broken higher-group symmetry. This theorem can be derived from the algebra of symmetry currents in the quantum field theory. The contribution sensitive to the higher-group structure appears at sub-leading order in the double-soft expansion. Treated within the context of the chiral effective field theory\, there are further\, non-universal contributions to the sub-leading soft theorem which depend on Wilson coefficients of higher-derivative operators. I will describe how these terms within the soft factors are renormalized at 1-loop\, with structure dictated by symmetry and the principles of effective field theory. 
LOCATION:Technological Institute\, F210\, 2145 Sheridan Road\, Evanston\, IL 60208
TRANSP:OPAQUE
URL:https://planitpurple.northwestern.edu/event/648126
CREATED:20261104T060000Z
STATUS:CONFIRMED
LAST-MODIFIED:20261108T204008Z
PRIORITY:0
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