Results 21 to 30 of about 35,230 (208)

Study of hyperfine structure in simple atoms and precision tests of the bound state QED [PDF]

, 2006
We consider the most accurate tests of bound state QED, precision theory of simple atoms, related to the hyperfine splitting in light hydrogen-like atoms.
Bennett, Czarnecki, Davier, Eidelman, Eidelman, Eides, Fischer, Heberle, Hughes, Karshenboim, Karshenboim, Karshenboim, Karshenboim, Kolachevsky, Kolachevsky, Mohr, N.N. Kolachevsky, Niering, P. Fendel, Prior, Reich, Rothery, S.G. Karshenboim, S.I. Eidelman, Sapirstein, T.W. Hänsch, V.A. Shelyuto, V.G. Ivanov   +27 more
core   +2 more sources

Rational terms of UV origin at two loops

Journal of High Energy Physics, 2020
The advent of efficient numerical algorithms for the construction of one-loop amplitudes has played a crucial role in the automation of NLO calculations, and the development of similar algorithms at two loops is a natural strategy for NNLO automation ...
Stefano Pozzorini, Hantian Zhang, Max F. Zoller   +2 more
doaj   +1 more source

QED Bremsstrahlung in decays of electroweak bosons [PDF]

, 2012
Isolated lepton momenta, in particular their directions are the most precisely measured quantities in pp collisions at LHC. This offers opportunities for multitude of precision measurements.
Arbuzov, A. B., Sadykov, R. R., Was, Z.
core   +2 more sources

NNLO virtual and real leptonic corrections to muon-electron scattering

Journal of High Energy Physics, 2021
The recently proposed MUonE experiment at CERN aims at providing a novel determination of the leading order hadronic contribution to the muon anomalous magnetic moment through the study of elastic muon-electron scattering at relatively small momentum ...
Ettore Budassi, Carlo M. Carloni Calame, Mauro Chiesa, Clara Lavinia Del Pio, Syed Mehedi Hasan, Guido Montagna, Oreste Nicrosini, Fulvio Piccinini   +7 more
doaj   +1 more source

PROBING HIGH-ENERGY PHYSICS WITH HIGH-PRECISION QED MEASUREMENTS [PDF]

HEP-MAD '01, 2002
I summarize our self-contained determinations of the lowest order hadronic contributions to the anomalous magnetic moments a_{ , } of the muon and tau leptons, the running QED coupling (M_Z) and the muonium hyperfine splitting . Using as a revised estimate of the light-by light scattering: a_ (LL)=85(18) 10^{-11}, we deduce: a_ ^{SM} = 116 591 ...
openaire   +2 more sources

The two-loop perturbative correction to the (g − 2) μ HLbL at short distances

Journal of High Energy Physics, 2021
The short-distance behaviour of the hadronic light-by-light (HLbL) contribution to (g − 2) μ has recently been studied by means of an operator product expansion in a background electromagnetic field.
Johan Bijnens, Nils Hermansson-Truedsson, Laetitia Laub, Antonio Rodríguez-Sánchez   +3 more
doaj   +1 more source

Vacuum birefringence in strong inhomogeneous electromagnetic fields [PDF]

, 2015
Birefringence is one of the fascinating properties of the vacuum of quantum electrodynamics (QED) in strong electromagnetic fields. The scattering of linearly polarized incident probe photons into a perpendicularly polarized mode provides a distinct ...
Gies, Holger, Karbstein, Felix, Reuter, Maria, Zepf, Matt   +3 more
core   +2 more sources

Isospin-breaking effects in the three-pion contribution to hadronic vacuum polarization

Journal of High Energy Physics, 2023
Isospin-breaking (IB) effects are required for an evaluation of hadronic vacuum polarization at subpercent precision. While the dominant contributions arise from the e + e − → π + π − channel, also IB in the subleading channels can become relevant for a ...
Martin Hoferichter, Bai-Long Hoid, Bastian Kubis, Dominic Schuh   +3 more
doaj   +1 more source

Isospin-breaking effects in the two-pion contribution to hadronic vacuum polarization

Journal of High Energy Physics, 2022
Isospin-breaking (IB) effects in the two-pion contribution to hadronic vacuum polarization (HVP) can be resonantly enhanced, if related to the interference of the ρ(770) and ω(782) resonances.
Gilberto Colangelo, Martin Hoferichter, Bastian Kubis, Peter Stoffer   +3 more
doaj   +1 more source

Radiative corrections in e+e− collisions with the BabaYaga event generator

EPJ Web of Conferences, 2017
The Monte Carlo event generator BabaYaga has been developed in the last decade for high precision simulation of QED processes (e+e− → e+e−, e+e− → μ+μ− and e+e− → γγ) at flavour factories, mainly for luminometry purposes, with an estimated theoretical ...
Carloni Calame Carlo M.
doaj   +1 more source