QED structure and fragmentation functions are systematically derived within the next-to-leading order approximation. DGLAP evolution equations are solved by iterations. Perturbative results are shown for electron parton distribution functions up to O(\alpha^3L^2), where L=\ln(\mu^2/m^e^2) is the large logarithm and \mu is the factorization energy scale. The results are relevant for the present...
The complete one-loop electroweak radiative corrections
to the cross section of the process
$e^{+}e^{-} \to e^{-}e^{+}(\gamma) $
are evaluated at low angles with the help of the SANC system.
Numerical results are given center-of-mass energy for the resonant energy of Z boson and 240 GeV in full phase space
with various experimental cuts.
In the relativistic quark model, based on point form of poincare-invariant quantum mechanics, the form-factors of pseudoscalar meson radiative decay $P^{\pm}(q\bar{Q})\rightarrow \ell^{\pm}~\nu_{\ell^{\pm}}\gamma$ are investigated. It's show that taking into account constituent quark structure functions leads to numerical evaluation close to modern experimental data.
Recent results on a study of exclusive processes of $e^+e^-$ annihilation into hadrons with the SND detector at the VEPP-2000 collider at center-of-mass energies below 2 GeV are presented. In particular, we discuss new data on the processes $e^+e^- \to n\bar{n}$, $p\bar{p}$, $\eta\gamma$, $\omega\pi^0$, $\pi^+\pi^-\pi^0$, $\pi^+\pi^-\pi^0\pi^0\eta$.
The contributions to the lepton magnetic moment anomaly, $a_L=(g-2)_L/2$, $L=e\ , \mu $ and $\tau$, generated by a specific class of QED diagrams are obtained explicitly up to the tenth order of the electromagnetic coupling constant. Calculations are performed within the Mellin-Barnes integral representation, which is widely used in consideration of multi-loop diagrams. The corresponding...
We report on newest results in kt-factorization for ep-processes. We describe HERA data on longitudinal structure function measurements as well as on associated prompt photon and jet photoproduction. The calculations include first application of the new LLM-2022 transverse momentum dependent gluon distribution developed by the authors. The study includes also the first implementation of parton...
Using first-principle numerical lattice simulations, we demonstrate that the hot gluon plasma develops strong inhomogeneity with angular rotation. In certain conditions the existence of mixed confinement-deconfinement phase, when the periphery and central regions of rotating system are in the different phases, becomes possible. We study the spatial distribution of the Polyakov loop in the...
Progress in applying the Bethe-Salpeter equation to study relativistic two-particle systems, in particular the deuteron at high energies [1] as well as recent successes in the application of the Bethe-Salpeter-Faddeev formalism for the study of three-nucleon nuclei (helion and triton) (binding energy, state amplitudes and electromagnetic form factors)[2] give a reason to assume that...
Energy levels of three-particle bound systems composed
of a helium nucleus, electron in 1S ground state and Pi^-, K^- mesons
in Rydberg state with principal and orbital momentum quantum
numbers of n\sim l+1\sim 17 are studied in variational approach
in quantum electrodynamics. Vacuum polarization and relativistic
corrections are taken into account.
The hadronic contribution of light-by-light scattering to the hyperfine structure of muonium is calculated using experimental data on the transition form factors of two photons into a hadron. The amplitudes of interaction between a muon and an electron with horizontal and vertical exchanges are constructed. The contributions due to the exchange of pseudoscalar, axial vector, scalar and tensor...
The Standard Model predicts a rapid enhancement of the cross section for scattering of electron antineutrinos on electrons at energies around the $W$ boson production threshold. This enhancement, usually referred to as the Glashow resonance, is currently searched for at the IceCube Neutrino Observatory and its discovery would be a crucial test of the lepton sector of the Standard Model. We...
One-loop electroweak radiative corrections to dilepton production in hadron collisions via photon fusion for Large Hadron Collider (LHC) experimental program are estimated, the most attention is paid to hard bremstrahlung. Discussed reaction follows the Drell-Yan process, its studying is the actual task of LHC experimental program. Detailed numerical analysis of electroweak radiative effects...
