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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:20220121T144146Z
UID:indico-event-10085@indico.bnl.gov
DESCRIPTION:The usual calculation method of field theory relies on Lagrang
ian under a certain symmetry. Then\, one can obtain amplitudes by using Fe
ynman rules and diagrams. In contrast\, a method called "scattering amplit
udes" (on-shell amplitudes\, modern amplitude method\, or spinor-helicity
formalism) provides the amplitudes directly from symmetries without relyin
g on Lagrangian. For example\, a calculation of gluon n-point scattering a
mplitudes can be greatly reduced in this method. The scattering amplitude
approach is expected to extract some essences in field theory\, which are
not obvious in the usual Feynman methods. Conventional scattering amplitud
e methods are the theory for massless particles\, basically. In 2017\, thi
s method was generalized to involve massive particles by Nima Arkani-Hamed
group. In this talk\, first\, I will provide a brief review of the scatte
ring amplitudes. Next\, I will introduce the scattering amplitude calculat
ions connected with electroweak symmetry breaking\, which are related to m
asses\, vev\, and longitudinal waves\, by using the generalized method. In
particular\, we do not use Lagrangian. We derived (strictly speaking\, re
-derived) several equations for electroweak symmetry breaking that are sup
posed to be inherent in field theory. This talk is based on arXiv:1909.105
51 and arXiv:2008.09652.\n\nhttps://bluejeans.com/871723105\n\nhttps://ind
ico.bnl.gov/event/10085/
LOCATION:
URL:https://indico.bnl.gov/event/10085/
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