Now showing items 10-13 of 13

    • Scattering equations and a new factorization for amplitudes. Part I. Gauge theories 

      Gomez, Humberto (Springer Verlag, 2019-05-01)
      In this work we show how a double-cover (DC) extension of the Cachazo, He and Yuan formalism (CHY) can be used to provide a new realization for the factorization of the amplitudes involving gluons and scalar fields. First, ...
    • Scattering equations and a new factorization for amplitudes. Part II. Effective field theories 

      Gomez, Humberto; Helset, Andreas (Springer Verlag, 2019-05-01)
      We continue the program of extending the scattering equation framework by Cachazo, He and Yuan to a double-cover prescription. We discuss how to apply the double-cover formalism to effective field theories, with a special ...
    • Two-loop superstring five-point amplitude and S -duality 

      Gomez, Humberto; Mafra, Carlos R.; Schlotterer, Oliver (American Physical Society, 2016-02-24)
      The low-energy limit of the massless two-loop five-point amplitudes for both type IIA and type IIB superstrings is computed with the pure spinor formalism and its overall coefficient determined from first principles. For ...
    • Λ scattering equations 

      Gomez, Humberto (Springer Verlag, 2016-06-01)
      Abstract: The CHY representation of scattering amplitudes is based on integrals over the moduli space of a punctured sphere. We replace the punctured sphere by a double-cover version. The resulting scattering equations ...