24 research outputs found
Quantum Field Theory and the Electroweak Standard Model
Lecture notes with a brief introduction to Quantum field theory and the
Standard Model are presented. The lectures were given at the 2017 European
School of High-Energy Physics. The main features, the present status, and
problems of the Standard Model are discussed.Comment: 35 page
Radiative Corrections to High Energy Lepton Bremsstrahlung on Heavy Nuclei
One-loop radiative corrections to the leptonic tensor in high energy
bremsstrahlung on heavy nuclei are calculated. Virtual and real photon
radiation is taken into account. Double bremsstrahlung is simulated by means of
Monte Carlo. Numerical results are presented for the case of muon
bremsstrahlung in conditions of the COMPASS experiment at CERN.Comment: 7 pages, 1 figur
Radiative Corrections to Neutrino Deep Inelastic Scattering Revisited
Radiative corrections to neutrino deep inelastic scattering are revisited.
One-loop electroweak corrections are re-calculated within the automatic SANC
system. Terms with mass singularities are treated including higher order
leading logarithmic corrections. Scheme dependence of corrections due to weak
interactions is investigated. The results are implemented into the data
analysis of the NOMAD experiment. The present theoretical accuracy in
description of the process is discussed.Comment: 19 pages, two figures are added, discussion of theoretical
uncertainties is extende
O(\alpha^2 \ln(m_\mu/m_e)) Corrections to Electron Energy Spectrum in Muon Decay
O(\alpha^2 \ln(m_\mu/m_e)) corrections to electron energy spectrum in muon
decay are computed using perturbative fragmentation function approach. The
magnitude of these corrections is comparable to anticipated precision of the
TWIST experiment at TRIUMF where Michel parameters will be extracted from the
measurement of the electron energy spectrum in muon decay.Comment: 8 pages, LaTeX, revtex4.cls, 1 PostScript figur
On relativization of the Sommerfeld-Gamow-Sakharov factor
The Sommerfeld-Gamow-Sakharov factor is considered for the general case of
arbitrary masses and energies. It is shown that the scalar triangular one-loop
diagram gives the Coulomb singularity in radiative corrections at the
threshold. The singular part of the correction is factorized at the complete
Born cross section regardless of its partial wave decomposition. Different
approaches to generalize the factor are discussed.Comment: 9 pages, 4 figures; references and discussion are extende
QED Corrections to Deep Inelastic Scattering with Tagged Photons at HERA
We calculate the QED corrections to deep inelastic scattering with tagged
photons at HERA in the leading logarithmic approximation. Due to the special
experimental setup, two large scales appear in the calculation that lead to two
large logarithms of comparable size. The relation of our formalism to the
conventional structure function formalism is outlined. We present some
numerical results and compare with previous calculations.Comment: 7 pages, REVTeX, 2 figures; published versio