Results 21 to 30 of about 886,321 (128)
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
The H2 Molecule; Test of QED and Varying Constants [PDF]
, 2013 Calculations of QED effects in molecules are tested by precision laser spectroscopy in H2, HD and D2. The same hydrogen molecule is used to probe variation of the proton-electron mass ratio on a cosmological time ...
Wim Ubachs, Ubachs, Wim; id_orcid
core +2 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
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
Photon splitting corrections to soft-photon resummation
Journal of High Energy Physics, 2023 In this paper we present an algorithm to add photon-splitting corrections to the Yennie-Frautschi-Suura-style soft-photon resummation available in the Sherpa MonteCarlo event generator.
Lois Flower, Marek Schönherr
doaj +1 more source
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
Initial conditions for electron and photon structure and fragmentation functions
Journal of High Energy Physics, 2019 In the computation of short-distance cross sections initiated by electrons and photons one can adopt the so-called structure-function approach, in which these particles play formally the same roles as hadrons do in QCD factorisation theorems, and must ...
S. Frixione
doaj +1 more source
Axial-vector transition form factors and e + e − → f 1 π + π −
Journal of High Energy Physics, 2023 We study the transition form factors (TFFs) of axial-vector mesons in the context of currently available experimental data, including new constraints from e + e − → f 1(1285)π + π − that imply stringent limits on the high-energy behavior and, for the ...
Martin Hoferichter +2 more
doaj +1 more source
Threshold corrections in precision LHC physics: QED x QCD
, 2004 With an eye toward LHC processes in which theoretical precisions of 1 percent are desired, we introduce the theory of the simultaneous YFS resummation of QED and QCD to compute the size of the expected resummed soft radiative threshold effects in ...
Jadach, S. +5 more
core +1 more source
High precision tests of QED and physics beyondthe standard model [PDF]
, 1998 We study the four most significant high precision observables of QED - the anomalous electron and muon magnetic moments, the hydrogen Lamb shift and muonium hyperfine splitting - in the context of gauge-invariant effective Lagrangians.
Escribano, Rafel +3 more
core +1 more source