Results 31 to 40 of about 33,765 (166)
Status of the BabaYaga event generator [PDF]
EPJ Web of Conferences, 2019 The Monte Carlo event generator BabaYaga has been developed for high precision simulation of QED processes (e+e−→ e+ e− , e+e−→ µ+µ− and e+e−→ γγ) at flavour factories, chiefly for luminometry purposes, with an estimated theoretical accuracy at the 0.1 ...
Carloni Calame Carlo M. +3 more
doaj +1 more source
Higher-order QED corrections to single-W production in electron-positron collisions [PDF]
, 2000 Four-fermion processes with a particle lost in the beam pipe are studied at LEP to perform precision tests of the electroweak theory. Leading higher-order QED corrections to such processes are analyzed within the framework of the Structure Functions (SF)
Montagna, G. +4 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 +2 more
doaj +1 more source
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 +7 more
doaj +1 more source
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 +3 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
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 +3 more
doaj +1 more source
QED effects in molecules: test on rotational quantum states of H$_2$ [PDF]
, 2011 Quantum electrodynamic effects have been systematically tested in the progression of rotational quantum states in the $X ^{1}\Sigma_{g}^{+}, v=0$ vibronic ground state of molecular hydrogen. High-precision Doppler-free spectroscopy of the $EF ^{1}\Sigma_{
Dickenson, G. D. +3 more
core +3 more sources
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 +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 +3 more
core +2 more sources