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VERSION:2.0
CALSCALE:GREGORIAN
PRODID:UW-Madison-Physics-Events
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SEQUENCE:3
UID:UW-Physics-Event-9588
DTSTART:20260413T180000Z
DTEND:20260413T193000Z
DTSTAMP:20260413T070221Z
LAST-MODIFIED:20260406T201915Z
LOCATION:Chamberlin 5280
SUMMARY:Constructibility of Massive Helicity Amplitudes and the ALT Sh
 ift\, Theory Seminar (High Energy/Cosmology)\, Zhen Liu\, Minnesota U.
DESCRIPTION:Recursive constructions in amplitudes are a strong feature
  that requires careful analytic continuation with momentum shift to yi
 eld the full\, correct\, physical amplitudes. If not done systematical
 ly\, an undetermined contact term would arise. We study the All-Line T
 ransverse (ALT) shift\, which we developed for on-shell recursion of a
 mplitudes for particles of any mass. Our method allows for a nice and 
 clean determination of the constructibility of the underlying theory. 
 We apply the shift to the QED\, electroweak theory\, and higher-spin C
 ompton scattering. The ALT shift framework allows consistent treatment
  in dealing with contact term ambiguities for renormalizable massive a
 nd massless theories\, which we show can be useful in studying real-wo
 rld amplitudes with massive spinors.
URL:https://www.physics.wisc.edu/events/?id=9588
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