Theory Seminar

KEK Theory Seminar/Dr. Vazquez-Mozo

Start:2017/10/17 (Tue) 11:00 AM
End:2017/10/17 (Tue) 12:00 PM
Location: Kenkyu-Honkan 1F, Meeting Room 3

Speaker:Dr. Miguel Vazquez-Mozo (Universidad de Salamanca)
Lecture:Planar Zeros in Field and String Theory Amplitudes
Contact:Takao Suyama/


Planar zeros are an interesting feature of certain scattering amplitudes
with one or more gauge bosons radiated, consisting in the vanishing of
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
whenever the scattering is planar. String theory corrections to the
theory amplitudes spoil the projective nature of gauge planar zeros, as
well as the vanishing of gravitational planar amplitudes.

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