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SUMMARY:Constructing Massive Scattering Amplitudes for Electroweak Effecti
ve Field Theory
DTSTART;VALUE=DATE-TIME:20211029T010000Z
DTEND;VALUE=DATE-TIME:20211029T030000Z
DTSTAMP;VALUE=DATE-TIME:20230610T072352Z
UID:indico-event-90@indico.nitep.osaka-cu.ac.jp
DESCRIPTION:\n日時：2021年10月29日(金) 午前10時\n講演者：
北原 鉄平氏（名古屋大）\nタイトル：Constructing Massive Sc
attering Amplitudes for Electroweak Effective Field Theory\n\nアブスト
ラクト： Usual calculation for quantum field theory relies on Lagrangi
an under a certain symmetry. Then\, one can obtain amplitudes by taking Fe
ynman rules and diagrams. In contrast\, a method called ''scattering ampli
tudes'' (also called on-shell \namplitudes\, modern amplitude method\, or
spinor-helicity formalism) directly provides the amplitudes from symmetrie
s without relying on Lagrangian. For example\, calculations of gluon n-poi
nt scattering amplitudes can be greatly reduced in \nthis method. This app
roach is expected to extract some essences in quantum field theory\, which
are not obvious in the usual Feynman methods. Basically\, conventional sc
attering amplitudes are methods for the massless theory. From 2017\, \nthi
s method has been generalized to involve any-spin massive particles by Nim
a Arkani-Hamed group. In this talk\, first\, I will provide a brief review
of the massless and massive scattering amplitudes. Next\, I will introduc
e the scattering amplitude \ncalculations connected with electroweak symme
try breaking\, which are related to masses\, vev\, and longitudinal waves.
In particular\, we do not use the standard model Lagrangian. We derived (
strictly speaking\, we re-derived) several equations \nfor electroweak sym
metry breaking that are supposed to be inherent in field theory. Also\, in
such a bottom-up approach\, we present the systematic derivation of indep
endent three-point and four-point contact terms. This talk is based on arX
iv:1909.10551 and arXiv:2008.09652.\n\nhttps://indico.nitep.osaka-cu.ac.jp
/event/90/
LOCATION:Zoom
URL:https://indico.nitep.osaka-cu.ac.jp/event/90/
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