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On-shell diagrams, Graßmannians and integrability for form factors

  • Regular Article - Theoretical Physics
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  • Published: 29 January 2016
  • Volume 2016, article number 182, (2016)
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Journal of High Energy Physics Aims and scope Submit manuscript
On-shell diagrams, Graßmannians and integrability for form factors
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  • Rouven Frassek1,
  • David Meidinger2,
  • Dhritiman Nandan2 &
  • …
  • Matthias Wilhelm2 

  • 465 Accesses

  • 40 Citations

  • 1 Altmetric

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A preprint version of the article is available at arXiv.

Abstract

We apply on-shell and integrability methods that have been developed in the context of scattering amplitudes in \( \mathcal{N}=4 \) SYM theory to tree-level form factors of this theory. Focussing on the colour-ordered super form factors of the chiral part of the stress-tensor multiplet as an example, we show how to systematically construct on-shell diagrams for these form factors with the minimal form factor as further building block in addition to the three-point amplitudes. Moreover, we obtain analytic representations in terms of Graßmannian integrals in spinor helicity, twistor and momentum twistor variables. While Yangian invariance is broken by the operator insertion, we find that the form factors are eigenstates of the integrable spin-chain transfer matrix built from the monodromy matrix that yields the Yangian generators. Constructing them via the method of R operators allows to introduce deformations that preserve the integrable structure. We finally show that the integrable properties extend to minimal tree-level form factors of generic composite operators as well as certain leading singularities of their n-point loop-level form factors.

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  1. Department of Mathematical Sciences, Durham University, South Road, Durham, DH1 3LE, U.K.

    Rouven Frassek

  2. Institut für Mathematik und Institut für Physik, Humboldt-Universität zu Berlin, IRIS Gebäude, Zum Großen Windkanal 6, 12489, Berlin, Germany

    David Meidinger, Dhritiman Nandan & Matthias Wilhelm

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Frassek, R., Meidinger, D., Nandan, D. et al. On-shell diagrams, Graßmannians and integrability for form factors. J. High Energ. Phys. 2016, 182 (2016). https://doi.org/10.1007/JHEP01(2016)182

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  • Received: 02 October 2015

  • Accepted: 14 January 2016

  • Published: 29 January 2016

  • DOI: https://doi.org/10.1007/JHEP01(2016)182

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Keywords

  • Scattering Amplitudes
  • Integrable Field Theories
  • Supersymmetric gauge theory
  • AdS-CFT Correspondence
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