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SUMMARY:[Riken Seminar] Electroweak effective field theory from massive sc
attering amplitudes
DTSTART;VALUE=DATE-TIME:20201203T140000Z
DTEND;VALUE=DATE-TIME:20201203T160000Z
DTSTAMP;VALUE=DATE-TIME:20220924T165500Z
UID:indico-event-10085@indico.bnl.gov
DESCRIPTION:Speakers: Teppei Kitahara (Nagoya University)\n\nThe usual cal
culation method of field theory relies on Lagrangian under a certain symme
try. Then\, one can obtain amplitudes by using Feynman rules and diagrams.
In contrast\, a method called "scattering amplitudes" (on-shell amplitude
s\, modern amplitude method\, or spinor-helicity formalism) provides the a
mplitudes directly from symmetries without relying on Lagrangian. For exam
ple\, a calculation of gluon n-point scattering amplitudes can be greatly
reduced in this method. The scattering amplitude approach is expected to e
xtract some essences in field theory\, which are not obvious in the usual
Feynman methods. Conventional scattering amplitude methods are the theory
for massless particles\, basically. In 2017\, this method was generalized
to involve massive particles by Nima Arkani-Hamed group. In this talk\, fi
rst\, I will provide a brief review of the scattering amplitudes. Next\, I
will introduce the scattering amplitude calculations connected with elect
roweak symmetry breaking\, which are related to masses\, vev\, and longitu
dinal waves\, by using the generalized method. In particular\, we do not u
se Lagrangian. We derived (strictly speaking\, re-derived) several equatio
ns for electroweak symmetry breaking that are supposed to be inherent in f
ield theory. This talk is based on arXiv:1909.10551 and arXiv:2008.09652.\
n\nhttps://bluejeans.com/871723105\n\nhttps://indico.bnl.gov/event/10085/
URL:https://indico.bnl.gov/event/10085/
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