Quantum Electrodynamics (QED) serves as a useful toy model for classical observables in gravitational two-body systems with reduced complexity due to the linearity of QED. We investigate scattering scalar QED at sixth order charges (two-loop order) regime analogous post-Minkowskian expansion General Relativity. employ modern amplitude tools and extract by both eikonal methods formalism Kosower,...

The intrinsic decay rate of orthopositronium formed in SiO2 powder is measured using the direct 2γ correction method such that the time dependence of the pick-off annihilation rate is precisely determined using high energy-resolution germanium detectors. As a systematic test, two different types of SiO2 powder are used with consistent findings. The intrinsic decay rate of orthopositronium is fo...

QED, Hadronic, and Electroweak Standard Model contributions to the muon anomalous magnetic moment, aμ ≡ (gμ − 2)/2, are reviewed. Theoretical uncertainties in the prediction a μ = 116 591 597(67)× 10 are scrutinized. Effects due to “New Physics” are described. Implications of the current experiment vs. theory constraint a μ −aSM μ = 453(465)×10−11 and anticipated near term error reduction to ±1...

Order α 2 corrections to the decay rate of orthopositronium are calculated in the framework of nonrelativistic QED. The resulting contribution is found to be in significant disagreement with one set of experimental measurements, though another experiment is in agreement with theory. The discrepancy between theory and experiment for the decay rate of orthopositronium has long been one of the out...

The standard determination of the QED coupling on the Z pole is performed using the latest available data for R. The direct application of analytic continuation techniques is found not to improve the accuracy of the value of α(M2 Z). However they help to resolve an ambiguity in the values of R in the energy region √ s ∼ 2 GeV, which, in turn, reduces the uncertainty in α(M2 Z). Moreover, they p...

Higher order renormalons beyond the chain of one-loop bubbles are discussed. A perturbation method for the infrared renormalon residue is found. The large order behavior of the current-current correlation function due to the first infrared renormalon is determined in both QED and QCD to the first three orders.

The present status of the calculation of radiative corrections to chargino and neutralino pair production processes in the MSSM is summarized. The main focus will be on the use of the on-shell renormalization scheme for charginos and neutralinos in conjunction with DR-bar parameters, such as those of the SPA conventions. Associated soft and hard bremsstrahlung and an appropriate separation of Q...

Order α 2 corrections to the decay rate of orthopositronium are calculated in the framework of nonrelativistic QED. The resulting contribution is found to be in significant disagreement with one set of experimental measurements, though another experiment is in agreement with theory. The discrepancy between theory and experiment for the decay rate of orthopositronium has long been one of the out...

Radiative corrections to the Casimir force between two parallel plates are considered in both scalar field theory of one massless and one massive field and in QED. Full calculations are contrasted with calculations based on employing “boundary-free” effective field theories. The difference between two previous results on QED radiative corrections to the Casimir force between two parallel plates...

We prove existence of a ground state and resonances in the standard model of the non-relativistic quantum electro-dynamics (QED). To this end we introduce a new canonical transformation of QED Hamiltonians and use the spectral renormalization group technique with a new choice of Banach spaces.