Results 31 to 40 of about 36,776 (204)

Comment on nonperturbative effects in [PDF]

Physics Letters B, 1997
Abstract Uncertainties in the theoretical prediction for the inclusive B → X s γ decay rate are discussed. We emphasize that there is no operator product expansion for this process. Nonetheless, some nonperturbative effects involving a virtual c c loop are calculable using the operator product expansion.
Zoltan Ligeti, Lisa Randall, Mark B. Wise   +2 more
openaire   +1 more source

Gentle introduction to rigorous Renormalization Group: a worked fermionic example

Journal of High Energy Physics, 2021
Much of our understanding of critical phenomena is based on the notion of Renormalization Group (RG), but the actual determination of its fixed points is usually based on approximations and truncations, and predictions of physical quantities are often of
Alessandro Giuliani, Vieri Mastropietro, Slava Rychkov   +2 more
doaj   +1 more source

Quantum unitary dynamics of a charged fermionic field and Schwinger effect

Journal of High Energy Physics, 2021
In quantum field theory, particle creation occurs, in general, when an intense external field, such as an electromagnetic field, breaks time translational invariance. This leads to an ambiguity in the definition of the vacuum state.
Álvaro Álvarez-Domínguez, Luis J. Garay, David García-Heredia, Mercedes Martín-Benito   +3 more
doaj   +1 more source

Nonperturbative QED effective action at finite temperature [PDF]

Physical Review D, 2010
RevTex4, 6pages, no figure; replaced by the version to be published in Phys.
Kim, Sang Pyo, Lee, Hyun Kyu, Yoon, Yongsung   +2 more
openaire   +2 more sources

Nonperturbative versus perturbative effects in generalized parton distributions [PDF]

, 2004
Generalized parton distributions (GPDs) are studied at the hadronic (nonperturbative) scale within different assumptions based on a relativistic constituent quark model.
A. Mair, A. V. Belitsky, A. V. Belitsky, A. V. Radyushkin, A. W. Thomas, B. Pasquini, D. Diakonov, E. Witten, G. Altarelli, G. Parisi, H. Holtmann, J. Speth, M. Diehl, M. Glück, M. Glück, M. Traini, M. Traini, P. Faccioli, R. L. Jaffe, R. P. Feynman, S. Boffi, S. Boffi, S. Boffi, T. Weigl, V. R. Zoller, V. R. Zoller   +25 more
core   +2 more sources

Emergent symmetry in Brownian SYK models and charge dependent scrambling

Journal of High Energy Physics, 2022
In this work, we introduce a symmetry-based approach to study the scrambling and operator dynamics of Brownian SYK models at large finite N and in the infinite N limit.
Lakshya Agarwal, Shenglong Xu
doaj   +1 more source

Scattering amplitudes from dispersive iterations of unitarity

Journal of High Energy Physics, 2023
We present and numerically implement a computational method to construct relativistic scattering amplitudes that obey analyticity, crossing, elastic and inelastic unitarity in three and four spacetime dimensions.
Piotr Tourkine, Alexander Zhiboedov
doaj   +1 more source

Nonperturbative decoupling and effective field theory [PDF]

Physical Review D, 1995
12 pages no figures.
openaire   +3 more sources

Quantum distillation of Hilbert spaces, semi-classics and anomaly matching

Journal of High Energy Physics, 2018
A symmetry-twisted boundary condition of the path integral provides a suitable framework for the semi-classical analysis of nonperturbative quantum field theories (QFTs), and we reinterpret it from the viewpoint of the Hilbert space. An appropriate twist
Gerald V. Dunne, Yuya Tanizaki, Mithat Ünsal   +2 more
doaj   +1 more source

Drell-Yan angular lepton distributions at small x from TMD factorization.

Journal of High Energy Physics, 2021
The Drell-Yan process is studied in the framework of TMD factorization in the Sudakov region s » Q 2 » q ⊥ 2 $$ {q}_{\perp}^2 $$ corresponding to recent LHC experiments with Q 2 of order of mass of Z-boson and transverse momentum of DY pair ∼ few tens ...
Ian Balitsky
doaj   +1 more source