KEK Theory Seminar/Dr. Vazquez-Mozo

Category
Start2017/10/17(Tue)11:00 AM
End2017/10/17(Tue)12:00 PM
Venue Kenkyu-Honkan 1F, Meeting Room 3
TitlePlanar Zeros in Field and String Theory Amplitudes
SpeakerDr. Miguel Vazquez-Mozo (Universidad de Salamanca)
Language英語/English
ContactTakao Suyama/tsuyama-AT-post.kek.jp
Website
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Abstract


Abstract:
Planar zeros are an interesting feature of certain scattering amplitudes
with one or more gauge bosons radiated, consisting in the vanishing of
the
amplitude for configurations where all momenta lie on a single plane. In
this talk I shall study these planar zeros in various field theories at
tree-level. In the case of theories with gauge invariance, the zeros are
determined by the vanishing of a homogeneous polynomial in the
stereographic coordinates determining the direction of flight of the
particles involved. This projective property is absent in pure scalar
theories. In gravitational theories, on the other hand, amplitudes
vanish
whenever the scattering is planar. String theory corrections to the
field
theory amplitudes spoil the projective nature of gauge planar zeros, as
well as the vanishing of gravitational planar amplitudes.

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