Semi-abelian Z-theory: NLSM+phi^3 from the open string

Abstract : We continue our investigation of Z-theory, the second double-copy component of open-string tree-level interactions besides super-Yang-Mills (sYM). We show that the amplitudes of the extended non-linear sigma model (NLSM) recently considered by Cachazo, Cha, and Mizera are reproduced by the leading alpha'-order of Z-theory amplitudes in the semi-abelian limit. The extension refers to a coupling of NLSM pions to bi-adjoint scalars, and the semi-abelian limit refers to a partial symmetrization over one of the color orderings that characterize the Z-theory amplitudes. Alternatively, the partial symmetrization corresponds to a mixed interaction among abelian and non-abelian states in the underlying open-superstring amplitude. We simplify these permutation sums via monodromy relations which greatly increase the efficiency in extracting the alpha'-expansion of these amplitudes. Their alpha'-corrections encode higher-derivative interactions between NLSM pions and bi-colored scalars all of which obey the duality between color and kinematics. Through double copy, these results can be used to generate the predictions of supersymmetric Dirac-Born-Infeld-Volkov-Akulov theory coupled with sYM as well as a complete tower of higher-order alpha'-corrections.
Type de document :
Pré-publication, Document de travail
27 pages. 2017
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Contributeur : John Joseph Carrasco <>
Soumis le : mercredi 4 janvier 2017 - 17:28:54
Dernière modification le : lundi 27 août 2018 - 09:44:01
Document(s) archivé(s) le : mercredi 5 avril 2017 - 15:01:17


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  • HAL Id : cea-01426648, version 1
  • ARXIV : 1612.06446


John Joseph M. Carrasco, Carlos R. Mafra, Oliver Schlotterer. Semi-abelian Z-theory: NLSM+phi^3 from the open string. 27 pages. 2017. 〈cea-01426648〉



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