1,032 research outputs found
Radiative nonrecoil nuclear finite size corrections of order to the Lamb shift in light muonic atoms
On the basis of quasipotential method in quantum electrodynamics we calculate
nuclear finite size radiative corrections of order to the
Lamb shift in muonic hydrogen and helium. To construct the interaction
potential of particles, which gives the necessary contributions to the energy
spectrum, we use the method of projection operators to states with a definite
spin. Separate analytic expressions for the contributions of the muon
self-energy, the muon vertex operator and the amplitude with spanning photon
are obtained. We present also numerical results for these contributions using
modern experimental data on the electromagnetic form factors of light nuclei.Comment: 8 pages, 1 Figur
Hyperfine structure of S-states in muonic deuterium
On the basis of quasipotential method in quantum electrodynamics we calculate
corrections of order and to hyperfine structure of S-wave
energy levels of muonic deuterium. Relativistic corrections, effects of vacuum
polarization in first, second and third orders of perturbation theory, nuclear
structure and recoil corrections are taken into account. The obtained numerical
values of hyperfine splitting meV (1S state) and
meV (2S state) represent reliable estimate for a
comparison with forthcoming experimental data of CREMA collaboration. The
hyperfine structure interval meV can be used for precision check of quantum
electrodynamics predictions for muonic deterium.Comment: 18 pages, 7 figure
The correction of hadronic nucleus polarizability to hyperfine structure of light muonic atoms
The calculation of hadronic polarizability contribution of the nucleus to
hyperfine structure of muonic hydrogen and helium is carried out within the
unitary isobar model and experimental data on the polarized structure functions
of deep inelastic lepton-proton and lepton-deuteron scattering. The calculation
of virtual absorption cross sections of transversely and longitudinally
polarized photons by nucleons in the resonance region is performed in the
framework of the program MAID.Comment: 8 pages, 3 figures, Talk presented at 23th International Workshop on
High Energy Physics and Quantum Field Theory (QFTHEP 2017
Energy levels of mesonic helium in quantum electrodynamics
On the basis of variational method we study energy levels of pionic helium
and kaonic helium with an electron in ground state and
a meson in excited state with principal and orbital quantum numbers . Variational wave functions are taken in the Gaussian form. Matrix
elements of the basic Hamiltonian and corrections to vacuum polarization and
relativism are calculated analytically in a closed form. We calculate some
bound state energies and transition frequencies which can be studied in the
experiment.Comment: 12 pages, 6 figure
Contribution of hadronic light-by-light scattering to the hyperfine structure of muonium
The contribution of hadronic scattering of light-by-light 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 exchange are
constructed. The contributions due to the exchange of pseudoscalar, axial
vector, scalar and tensor mesons are taken into account.Comment: 13 pages, 1 figur
Proton polarizability effect in the hyperfine splitting of the hydrogen atom
The contribution of the proton polarizability to the ground state hyperfine
splitting in the hydrogen atom is evaluated on the basis of isobar model and
evolution equations for the parton distributions. The contributions of the Born
terms, vector meson exchanges and nucleon resonances are taken into account in
the construction of the proton polarized structure functions .
Numerical values of this effect are equal times
the Fermi splitting in electronic hydrogen and
times the Fermi splitting in muonic hydrogen.Comment: 11 pages, 5 figure
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