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CHY Formulae for Amplitudes from Higher-Dimensional Operators
2017-06-07     Text Size:  A

Institute of Theoretical Physics

Chinese Academy of Sciences

 Key Laboratory of Theoretical Physics

Seminar

Title

题目

CHY Formulae for Amplitudes from Higher-Dimensional Operators

Speaker

报告人

Yong Zhang(张勇)

Affiliation

所在单位

Beijing Normal University

Date

日期

3:30pm, Wednesday, June 7, 2017

Venue

地点

Conference Hall 322, ITP

Abstract

摘要

We study tree-level amplitudes from higher-dimensional operators, including F^3 operator of gauge theory, and R^2 , R^3 operators of gravity, in the Cachazo-He-Yuan formulation. As a generalization of the reduced Pfaffian in Yang-Mills theory, we find a new, gauge-invariant object that leads to gluon amplitudes with a single insertion of F^3 , and gravity amplitudes by Kawai-Lewellen-Tye relations. When reduced to four dimensions for given helicities, the new object vanishes for any solution of scattering equations on which the reduced Pfaffian is non-vanishing. This intriguing behavior in four dimensions explains the vanishing of graviton helicity amplitudes produced by the Gauss-Bonnet R^2 term, and provides a scattering-equation origin of the decomposition into self-dual and anti-self-dual parts for F^3 and R^3 amplitudes.

Contact person

所内联系人

Song He
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