A bstract We present the Standard Model Effective Field Theories (SMEFT) from purely on-
shell arguments. Starting from few basics assumptions such as Poincaré invariance and …

A bstract We bootstrap the three-point form factor of the chiral part of the stresstensor
supermultiplet in planar\(\mathcal {N}\)= 4 super-Yang-Mills theory, obtaining new results at …

Form factors are quantities that involve both asymptotic on-shell states and gauge invariant
operators. They provide a natural bridge between on-shell amplitudes and off-shell …

An analytic formula is given for the three-point energy correlator at leading order in
maximally supersymmetric Yang-Mills theory (N= 4 sYM). This is the first analytic calculation …

A bstract We introduce a new class of collider-type observables in conformal field theories
which we call generalized event shapes. They are defined as matrix elements of light-ray …

A bstract We present the detailed computation of full-color three-loop three-point form factors
of both the stress-tensor supermultiplet and a length-three BPS operator in 𝒩= 4 SYM. The …

A bstract The construction of perturbative quantities on non-linear backgrounds leads to the
possibility of incorporating strong field effects in perturbation theory. We continue a …

A bstract In the low-energy effective action of string theories, non-abelian gauge interactions
and supergravity are augmented by infinite towers of higher-mass-dimension operators. We …

A bstract Form factors, as quantities involving both local operators and asymptotic particle
states, contain information of both the spectrum of operators and the on-shell amplitudes. So …

This chapter introduces the foundational concepts and techniques for scattering amplitudes.
It is meant to be accessible to readers with only a basic understanding of quantum field …