Results 91 to 100 of about 2,316,597 (371)

Scattering amplitudes and contour deformations [PDF]

Physical Review D, 2019
We employ a scalar model to exemplify the use of contour deformations when solving Lorentz-invariant integral equations for scattering amplitudes. In particular, we calculate the onshell 2 -> 2 scattering amplitude for the scalar system. The integrals produce branch cuts in the complex plane of the integrand which prohibit a naive Euclidean ...
Pedro Duarte, Gernot Eichmann, Alfred Stadler, Alfred Stadler, M. T. Peña   +4 more
openaire   +3 more sources

Scattering amplitudes and electromagnetic horizons

Journal of High Energy Physics, 2023
Abstract We consider the scattering of charged particles on particular electromagnetic fields which have properties analogous to gravitational horizons. Classically, particles become causally excluded from regions of spacetime beyond a null surface which we identify as the ‘electromagnetic horizon’.
Anton Ilderton, William Lindved
openaire   +3 more sources

On the relation between the Deuteron Form Factor at High Momentum Transfer and the High Energy Neutron-Proton Scattering Amplitude [PDF]

, 2004
A non-relativistic potential-model version of the factorization assumption, used in perturbative QCD calculations of hadronic form factors, is used, along with the Born approximation valid at high energies, to derive a remarkably simple relationship ...
Gerald A. Miller, J. Carbonell, M. M. Giannini, Mark Strikman   +3 more
core   +1 more source

The SAGEX review on scattering amplitudes Chapter 7: Positive geometry of scattering amplitudes

Journal of Physics A: Mathematical and Theoretical, 2022
Abstract Scattering amplitudes are both a wonderful playground to discover novel ideas in quantum field theory and simultaneously of immense phenomenological importance to make precision predictions for e.g. particle collider observables and more recently also for gravitational wave signals. In this review chapter, we give an overview of
Enrico Herrmann, Jaroslav Trnka
openaire   +2 more sources

Early metastasis is characterized by Gr1+ cell dysregulation and is inhibited by immunomodulatory nanoparticles

Molecular Oncology, EarlyView.
Breast cancer metastasis is associated with myeloid cell dysregulation and the lung‐specific accumulation of tumor‐supportive Gr1+ cells. Gr1+ cells support metastasis, in part, through a CHI3L1‐mediated mechanism, which can be targeted and inhibited with cargo‐free, polymeric nanoparticles.
Jeffrey A. Ma, Sophia M. Orbach, Kate V. Griffin, Kathryn Kang, Yining Zhang, Rebecca S. Pereles, Ian A. Schrack, Guillermo Escalona, Jacqueline S. Jeruss, Lonnie D. Shea   +9 more
wiley   +1 more source

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. In this note, we point out that scattering amplitudes can also have another class of singularities called natural boundaries of analyticity.
openaire   +3 more sources

Biophysical characterization and ion transport with cell‐based and proteoliposome reconstitution assays of invertebrate K+‐Cl− cotransporters

FEBS Open Bio, EarlyView.
The K+‐Cl− cotransporters (KCCs) facilitate the symport of ions across the plasma membrane. They participate in physiological processes including neuronal regulation. Here, we characterized KCCs from Drosophila and Hydra vulgaris. Comparative analyses of transporters provide insights into the mechanism of KCC ion transport, regulation, and evolution ...
Satoshi Fudo, Marina Verkhovskaya, Coralie Di Scala, Claudio Rivera, Tommi Kajander   +4 more
wiley   +1 more source

Diffractive and deeply virtual Compton scattering in holographic QCD [PDF]

, 2012
We further analyze the holographic dipole-dipole scattering amplitude developed in arXiv:1202.0831, 1205.3223. Gribov diffusion at strong coupling yields the scattering amplitude in a confining background.
Stoffers, Alexander, Zahed, Ismail
core  

Relativistic theory of magnetic scattering of x rays: Application to ferromagnetic iron [PDF]

, 1997
We present a detailed description of a first-principles formalism for magnetic scattering of circularly polar- ized x rays from solids in the framework of the fully relativistic spin-polarized multiple-scattering theory.
%F. E. Low, A. Fasolino, A. H. MacDonald, B. L. Gyorffy, C. Giorgetti, C. Kao, C.-C. Kao, D. D. Johnson, D. Gibbs, E. Arola, E. Arola, F. de Bergevin, G. Schütz, J. C. Lang, J. J. Sakurai, J. P. Hannon, J. P. Hill, J. S. Faulkner, K. Namikawa, L. V. Keldysh, M. Blume, M. Blume, M. E. Rose, M. Gell-Mann, O. Keski-Rahkonen, P. Carra, P. M. Platzman, P. Rennert, P. Strange, P. Strange, P. Strange, V. L. Moruzzi   +31 more
core   +1 more source

Scattering of spinning black holes from exponentiated soft factors [PDF]

Journal of High Energy Physics, 2018
We provide evidence that the classical scattering of two spinning black holes is controlled by the soft expansion of exchanged gravitons. We show how an exponentiation of Cachazo-Strominger soft factors, acting on massive higher-spin amplitudes, can be ...
A. Guevara, Alexander Ochirov, J. Vines
semanticscholar   +1 more source