Results 131 to 140 of about 11,408,683 (276)

What can be measured asymptotically?

Journal of High Energy Physics
We consider asymptotic observables in quantum field theories in which the S-matrix makes sense. We argue that in addition to scattering amplitudes, a whole compendium of inclusive observables exists where the time-ordering is relaxed.
Simon Caron-Huot, Mathieu Giroux, Holmfridur S. Hannesdottir, Sebastian Mizera   +3 more
doaj   +1 more source

Limits of TMD evolution in SIDIS at moderate Q

EPJ Web of Conferences, 2015
We investigate semi-inclusive deep inelastic scattering measurements in the region of relatively small Q, where sensitivity to nonperturbative transverse momentum dependence can dominate the evolution.
Gamberg Leonard
doaj   +1 more source

Nonperturbative effects in the proton sea

, 1999
We revisit the evaluation of the pionic mechanism of the $\bar{u}-\bar{d}$-asymmetry in the proton structure function. Our analysis is based on the unitarity relation between contributions of different mechanisms to the inclusive particle production and the total photoabsorption cross-section (i.e. the proton structure function).
Schäfer, W., Speth, J.
openaire   +2 more sources

Reducible contributions to quantum electrodynamics in external fields

Journal of High Energy Physics, 2019
We consider one-particle reducible (1PR) contributions to QED and scalar QED processes in external fields, at one-loop and two-loop order. We investigate three cases in detail: constant crossed fields, constant magnetic fields, and plane waves.
Naser Ahmadiniaz, James P. Edwards, Anton Ilderton   +2 more
doaj   +1 more source

Electroweak vacuum stability in the Higgs-Dilaton theory

Journal of High Energy Physics, 2017
We study the stability of the Electroweak (EW) vacuum in a scale-invariant extension of the Standard Model and General Relativity, known as a Higgs-Dilaton theory.
A. Shkerin
doaj   +1 more source

Tadpole diagrams in constant electromagnetic fields

Journal of High Energy Physics, 2017
We show how all possible one-particle reducible tadpole diagrams in constant electromagnetic fields can be constructed from one-particle irreducible constant-field diagrams.
Felix Karbstein
doaj   +1 more source

Nonperturbative interaction effects in the thermodynamics of disordered wires

, 2007
We study nonperturbative interaction corrections to the thermodynamic quantities of multichannel disordered wires in the presence of the Coulomb interactions.
A. M. Finkelstein, A. V. Andreev, B. I. Shklovskii, B. L. Altshuler, D. A. Pesin, K. B. Efetov, K. B. Efetov, K. B. Efetov, P. M. Morse, S. E. Korshunov, S. E. Korshunov   +10 more
core   +1 more source

UNIVERSAL NONPERTURBATIVE EFFECTS IN EVENT SHAPES FROM SOFT-COLLINEAR EFFECTIVE THEORY [PDF]

Modern Physics Letters A, 2007
Two-jet event shape distributions, traditionally studied in the language of perturbative QCD, can be described naturally in soft-collinear effective theory. In this language, we demonstrate factorization of event shape distributions into perturbatively-calculable hard and jet functions and nonperturbative soft functions, and show how the latter ...
openaire   +3 more sources

Experimental targets for photon couplings of the QCD axion

Journal of High Energy Physics, 2018
The QCD axion’s coupling to photons is often assumed to lie in a narrow band as a function of the axion mass. We demonstrate that several simple mechanisms, in addition to the photophilic clockwork axion already in the literature, can significantly ...
Prateek Agrawal, JiJi Fan, Matthew Reece, Lian-Tao Wang   +3 more
doaj   +1 more source

Scalar-fermion analytic bootstrap in 4D

Journal of High Energy Physics, 2019
In this work we discuss an analytic bootstrap approach [1, 2] in the context of spinning 4D conformal blocks [3, 4]. As an example we study the simplest spinning case, the scalar-fermion correlator ϕ ψ ϕ ψ ¯ $$ \left\langle \phi\ \psi\ \phi\ \overline ...
Emtinan Elkhidir, Denis Karateev
doaj   +1 more source