Results 61 to 70 of about 217,791 (313)

Structure of massive gauge/gravity scattering amplitudes, equivalence theorems, and extended double-copy with compactified warped space

Journal of High Energy Physics
We study the structure of scattering amplitudes of massive Kaluza-Klein (KK) states in the compactified 5-dimensional warped gauge and gravity theories.
Yanfeng Hang, Wei-Wei Zhao, Hong-Jian He, Yin-Long Qiu   +3 more
doaj   +1 more source

Massive scattering amplitudes in six dimensions

Journal of High Energy Physics, 2019
We show that a natural spinor-helicity formalism that can describe massive scattering amplitudes exists in D = 6 dimensions. This is arranged by having helicity spinors carry an index in the Dirac spinor 4 of the massive little group, SO(5) ∼ Sp(4).
Rishabh Jha, Chethan Krishnan, K. V. Pavan Kumar   +2 more
doaj   +1 more source

The edge visualization metric: Quantifying the improvement of lung SBRT target definition with 4D CBCT

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose Four‐dimensional cone‐beam CT (4D CBCT) incorporates oversampling of 3D data to reconstruct multi‐phase CBCT data sets representing distinct phases of the breathing cycle based on a diaphragmatic correlate of respiratory motion. Motion artifacts and blurring can be reduced relative to three‐dimensional cone‐beam (3D CBCT), allowing ...
Colton Baley, Sam Andersen, Clark Anderson, Shraddha Dalwadi, Daniel L. Saenz   +4 more
wiley   +1 more source

AN INTEGRAL EQUATION FOR SCATTERING AMPLITUDES

Physical Review Letters, 1969
We outline a dynamical scheme for studying Regge behavior of scattering amplitudes. It is based on unitarity and the concept of short-range momentum-space correlations in high-energy processes.
Chew, G. F., Goldberger, M. L., Low, F. E.   +2 more
openaire   +4 more sources

Superstring Scattering from D-Branes

, 1996
We derive fully covariant expressions for all two-point scattering amplitudes of two massless closed strings from a Dirichlet $p$-brane. This construction relies on the observation that there is a simple relation between these D-brane amplitudes in type ...
Dai, Duff, Friedan, Friedan, Friedan, Gibbons, Green, Green, Hofava, Hull, Kawai, Klebanov, Kostelecky, Leigh, Lu, Lu and C.N. Pope, Mandl, Mohammad R. Garousi, Peskin, Polchinski, Polchinski, Polchinski, Robert C. Myers, Schwarz, Schwarz, Townsend, Veltman, Witten, Witten, Witten   +29 more
core   +2 more sources

Localization accuracy of 6‐second CBCT for lung IGRT with various breathing patterns

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose The 6‐second cone beam computed tomography (CBCT) acquisition of the Ethos HyperSight (Varian Medical Systems, Inc. Palo Alto, CA, USA) on‐board imaging system offers benefits, but could be too fast to accurately capture an average target position in a free‐breathing lung cancer patient. This study aimed to ascertain whether a 6‐second
Jihye Koo, Gage Redler, Vladimir Semenenko, Stephen A. Rosenberg, Emily Keit, Jacqueline M. Andreozzi   +5 more
wiley   +1 more source

High-energy fixed-angle meson scattering and the constituent counting rule in holographic QCD

Journal of High Energy Physics
We investigate the high-energy fixed-angle scattering of pions and ρ-mesons in a bottom-up holographic QCD model. To this end, we generalise the approach of Polchinski and Strassler [1] to write an ansatz for meson scattering amplitudes based on ...
Adi Armoni, Bartosz Pyszkowski, Shigeki Sugimoto, Dorin Weissman   +3 more
doaj   +1 more source

Loop Amplitudes and Quantum Homotopy Algebras

Journal of High Energy Physics, 2020
We derive a recursion relation for loop-level scattering amplitudes of La- grangian field theories that generalises the tree-level Berends-Giele recursion relation in Yang-Mills theory.
Branislav Jurčo, Tommaso Macrelli, Christian Sämann, Martin Wolf   +3 more
doaj   +1 more source

The Amplituhedron [PDF]

, 2013
Perturbative scattering amplitudes in gauge theories have remarkable simplicity and hidden infinite dimensional symmetries that are completely obscured in the conventional formulation of field theory using Feynman diagrams. This suggests the existence of
Arkani-Hamed, Nima, Trnka, Jaroslav
core   +3 more sources

Spinning amplitudes from scalar amplitudes

Journal of High Energy Physics, 2021
We provide a systematic method to compute tree-level scattering amplitudes with spinning external states from amplitudes with scalar external states in arbitrary spacetime dimensions.
Mahesh K. N. Balasubramanian, Raj Patil, Arnab Rudra   +2 more
doaj   +1 more source