TL;DR
This paper provides an introductory overview of scattering amplitudes, covering key concepts, computational techniques, and recent advances like color-kinematics duality, with applications across gravity, gauge theory, and effective field theories.
Contribution
It offers a comprehensive tutorial on on-shell methods and highlights recent developments in field theoretic structures such as color-kinematics duality.
Findings
Introduction to spinor helicity formalism
Tutorial on tree-level amplitude bootstrapping
Discussion of color-kinematics duality
Abstract
These lectures are a brief introduction to scattering amplitudes. We begin with a review of basic kinematical concepts like the spinor helicity formalism, followed by a tutorial on bootstrapping tree-level scattering amplitudes. Afterwards, we discuss on-shell recursion relations and soft theorems, emphasizing their broad applicability to gravity, gauge theory, and effective field theories. Lastly, we report on some of the new field theoretic structures which have emerged from the on-shell picture, focusing primarily on color-kinematics duality.
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