Results 1 to 10 of about 31,625 (303)

Amplitudes, observables, and classical scattering [PDF]

Journal of High Energy Physics, 2019
We present a formalism for computing classically measurable quantities directly from on-shell quantum scattering amplitudes. We discuss the ingredients needed for obtaining the classical result, and show how to set up the calculation to derive the result
David A. Kosower, Ben Maybee, Donal O’Connell   +2 more
doaj   +10 more sources

Δ-algebra and scattering amplitudes [PDF]

Journal of High Energy Physics, 2019
In this paper we study an algebra that naturally combines two familiar operations in scattering amplitudes: computations of volumes of polytopes using triangulations and constructions of canonical forms from products of smaller ones.
Freddy Cachazo, Nick Early, Alfredo Guevara, Sebastian Mizera   +3 more
doaj   +4 more sources

Geometry in scattering amplitudes

Physical Review D, 2022
We formulate the field-space geometry for an effective field theory of scalars and gauge bosons. Geometric invariants such as the field-space curvature enter in both scattering amplitudes and the renormalization group equations, with the scalar and gauge results unified in a single expression.
Andreas Helset, Elizabeth E Jenkins, Aneesh V Manohar   +2 more
exaly   +4 more sources

Massive color-kinematics duality and double-copy for Kaluza-Klein scattering amplitudes

Journal of High Energy Physics, 2023
We study the structure of scattering amplitudes of massive Kaluza-Klein (KK) states under toroidal compactification. We present a shifting method to quantitatively derive the scattering amplitudes of massive KK gauge bosons and KK gravitons from the ...
Yao Li, Yan-Feng Hang, Hong-Jian He
doaj   +2 more sources

Natural boundaries for scattering amplitudes

SciPost Physics, 2023
Singularities, such as poles and branch points, play a crucial role in investigating the analytic properties of scattering amplitudes that inform new computational techniques.
Sebastian Mizera
doaj   +3 more sources

Positive moments for scattering amplitudes [PDF]

Physical Review D, 2021
We find the complete set of conditions satisfied by the forward $2\to2$ scattering amplitude in unitarity and causal theories. These are based on an infinite set of energy dependent quantities -- the arcs -- which are dispersively expressed as moments of a positive measure defined at (arbitrarily) higher energies.
Brando Bellazzini, Riccardo Rattazzi, Francesco Riva   +2 more
exaly   +4 more sources

Unifying relations for scattering amplitudes [PDF]

Journal of High Energy Physics, 2018
We derive new amplitudes relations revealing a hidden unity among a wideranging variety of theories in arbitrary spacetime dimensions. Our results rely on a set of Lorentz invariant differential operators which transmute physical tree-level scattering ...
Clifford Cheung, Chia-Hsien Shen, Congkao Wen   +2 more
doaj   +4 more sources

Scattering Amplitudes: Celestial and Carrollian

Physical Review Letters, 2022
21 ...
Arjun Bagchi, Rudranil Basu, Sudipta Dutta   +2 more
exaly   +4 more sources

Learning the simplicity of scattering amplitudes

SciPost Physics
The simplification and reorganization of complex expressions lies at the core of scientific progress, particularly in theoretical high-energy physics.
Clifford Cheung, Aurélien Dersy, Matthew D. Schwartz
doaj   +3 more sources

Resumming scattering amplitudes for waveforms

Journal of High Energy Physics
We develop a formalism to compute non-perturbative 5-point scattering amplitudes and apply it to gravitational waveforms in the two-body problem for arbitrary trajectories.
Katsuki Aoki, Andrea Cristofoli
doaj   +3 more sources