Journal of High Energy Physics

, 2019:78 | Cite as

Uniqueness from locality and BCFW shifts

  • Laurentiu RodinaEmail author
Open Access
Regular Article - Theoretical Physics


We introduce a BCFW shift that can be used to recursively build the full YangMills tree-level amplitude as a function of polarization vectors. Furthermore, in line with the recent results of [1], we conjecture that the Yang-Mills tree-level scattering amplitude is uniquely fixed by locality and demanding the usual asymptotic behavior under a sufficient number of shifts. Unitarity therefore emerges from locality and constructability. We prove this statement at the leading order in the soft expansion.


Scattering Amplitudes Gauge Symmetry Perturbative QCD 


Open Access

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Copyright information

© The Author(s) 2019

Authors and Affiliations

  1. 1.Department of PhysicsPrinceton UniversityPrincetonU.S.A.

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