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(Seminar) Pfaffian Diagrams for Gluon Tree Amplitudes

05/28 2018
  • Title (Seminar) Pfaffian Diagrams for Gluon Tree Amplitudes
  • Speaker
  • Date
  • Venue
  • Abstract

    CAS Key Laboratory of Theoretical Physics

    Institute of Theoretical Physics

     Chinese Academy of Sciences

    Seminar

    Title

    题目

    Pfaffian Diagrams for Gluon Tree Amplitudes

    Speaker

    报告人

    C.S. Lam

    Affiliation

    所在单位

    McGill/UBC

    Date

    日期

    2018年5月28日 13:00

    Venue

    地点

    Conference Room 6420, ITP new building

    Abstract

    摘要

    n-gluon scattering amplitudes are usually represented by Feynman diagrams. In this talk, I will discuss a completely different diagrammatic description based on the CHY theory. Whereas Feynman diagrams build up the final amplitufe from local interactions and propagations,  pfaffian diagrams give an integral approach describing the final result in one shot. They may be thought of as a way to regroup Feynman diagrams with similar numerators in the amplitude. This regrouping produce subsets of diagrams that are gauge-invariant for n-2 gluons, a property that is very useful in checking correctness of the calculation. Since the amplitude has been partly processed, Pfaffian diagrams often give rise to fewer number of terms than Feynman diagrams.

    Contact person

    所内联系人

    Song He