A. P. Martynenko

Proton-polarizability effect in the lamb shift for the hydrogen atom

The proton-polarizability contribution to the Lamb shift for the ordinary and muonic hydrogen atoms is calculated on the basis of the isobar model and experimental data on structure functions for deep-inelastic lepton-nucleon scattering. The contributions of Born terms, vector mesons, and nucleon resonances are taken into account in constructing cross sections for the absorption of transversely and longitudinally polarized virtual photons, σT,L.The proton polarizability correction to the Lamb shift of electronic and muonic hydrogen is calculated on the basis of isobar model and experimental data on the structure functions of deep inelastic lepton-nucleon scattering. The contributions of the Born terms, vector-meson exchanges and nucleon resonances are taken into account in the construction of the photoabsorption cross sections for transversely and longitudinally polarized virtual photons sigma_{T,L}.

Fine and hyperfine structure of P-wave levels in muonic hydrogen

Corrections of order α5 and α6 are calculated for muonic hydrogen in the fine-structure interval ΔEfs = E(2P3/2) − E(2P1/2) and in the hyperfine structure of the 2P1/2-and 2P3/2-wave energy levels. The resulting values of ΔEfs = 8352.08 µeV, ΔẼhfs(2P1/2) = 7819.80 µeV, and ΔẼhfs(2P3/2) = 3248.03 µeV provide reliable guidelines in performing a comparison with relevant experimental data and in more precisely extracting the experimental value of the (2P–2S) Lamb shift in the muonic-hydrogen atom.

Properties of doubly heavy baryons in the relativistic quark model

Mass spectra and semileptonic decay rates of baryons consisting of two heavy (b or c) and one light quark are calculated in the framework of the relativistic quark model. The doubly heavy baryons are treated in the quark-diquark approximation. The ground and excited states of both the diquark and quark-diquark bound systems are considered. The quark-diquark potential is constructed. The light quark is treated completely relativistically, while the expansion in the inverse heavy-quark mass is used. The weak transition amplitudes of heavy diquarks bb and bc going, respectively, to bc and cc are explicitly expressed through the overlap integrals of the diquark wave functions in the whole accessible kinematic range. The relativistic baryon wave functions of the quark-diquark bound system are used for the calculation of the decay matrix elements, the Isgur-Wise function, and decay rates in the heavy-quark limit.

Fine and hyperfine structure of the muonic 3He ion

AbstractOn the basis of quasipotential approach to the bound state problem in QED we calculate the vacuum polarization, relativistic, recoil, structure corrections of orders α5 and α6 to the fine structure interval ΔEfs = E(2P3/2) − E(2P1/2) and to the hyperfine structure of the energy levels 2P1/2 and 2P3/2 in muonic 23He ion. The resulting values ΔEfs = 144 803.15 µeV, Δ

Theory of the lamb shift in muonic deuterium

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Hyperfine structure of S- and P-wave states in muonic-helium ion

hfs(2P1/2) = −58 712.90 µeV, Δ

Heavy baryons in the relativistic quark model

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