The soft limits of scattering amplitudes have been extensively studied due to their essential
role in the computation of physical observables in collider physics. The universal …

Infrared divergences in the perturbative expansion of gauge theory amplitudes and cross
sections have been a focus of theoretical investigations for almost a century. New insights …

A bstract We study the variance in the measurement of observables during scattering events,
as computed using amplitudes. The classical regime, characterised by negligible …

A bstract A number of important observables exhibit logarithms in their perturbative
description that are induced by emissions at widely separated rapidities. These include …

A bstract We present a factorization theorem valid near the kinematic threshold\(z={Q}^
2/\hat {s}\to 1\) of the partonic Drell-Yan process\(q\overline {q}\to {\gamma}^{\ast}+ X\) for …

The N-jettiness observable TN provides a way of describing the leading singular behavior of
the N-jet cross section in the τ= TN/Q→ 0 limit, where Q is a hard interaction scale. We …

Cachazo and Strominger recently proposed an extension of the soft-graviton theorem found
by Weinberg. In addition, they proved the validity of their extension at tree level. This was …

We apply recently developed path integral resummation methods to perturbative quantum
gravity. In particular, we provide supporting evidence that eikonal graviton amplitudes …

A bstract We sum the leading logarithms\({\alpha} _s^ n {\ln}^{2n-1}\left (1-z\right)\), n= 1,
2,..., near the kinematic threshold\(z={m} _H^ 2/\hat {s}\to 1\) at next-to-leading power in the …

We show that at tree level, on-shell gauge invariance can be used to fully determine the first
subleading soft-gluon behavior and the first two subleading soft-graviton behaviors. Our …