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| CHY Formulae for Amplitudes from Higher-Dimensional Operators |
| 2017-06-07
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Institute of Theoretical Physics |
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Chinese Academy of Sciences |
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Key Laboratory of Theoretical Physics |
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Seminar |
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Title
题目 |
CHY Formulae for Amplitudes from Higher-Dimensional Operators |
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Speaker
报告人 |
Yong Zhang(张勇) |
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Affiliation
所在单位 |
Beijing Normal University |
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Date
日期 |
3:30pm, Wednesday, June 7, 2017 |
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Venue
地点 |
Conference Hall 322, ITP |
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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. |
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Contact person
所内联系人 |
Song He |
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