563 research outputs found
Nuclear Structure-Dependent Radiative Corrections to the Hydrogen Hyperfine Splitting
Radiative corrections to the Zemach contribution of the hydrogen hyperfine
splitting are calculated. Their contributions amount to ppm to the
HFS. The radiative recoil corrections are estimated to be ppm and
heavy particle vacuum polarization shifts the HFS by ppm. The status
of the nuclear-dependent contributions are considered. From the comparison of
theory and experiment the proton polarizability contribution of ppm is
found. The nuclear structure-dependent corrections to the difference
are also obtained.Comment: 19 pages, 3 tables, 2 Postscript figure
Delbruck scattering and the g-factor of a bound electron
The leading contribution of the light-by-light scattering effects to g-factor
of a bound electron is derived. The corresponding amplitude is expressed in
terms of low-energy Delbruck scattering of a virtual photon. The result reads
Delta g = (7/216) alpha (Z alpha)^5
Vacuum polarization in muonic and antiprotonic atoms: the fine structure at medium Z
Effects of vacuum polarization modify the energy levels in atoms with an
orbiting particle heavier than an electron. The dominant effect is due to the
Uehling potential. In this paper we consider the relativistic corrections to
the energy levels caused by the Uehling potential and in particular the fine
structure in muonic and antiprotonic atoms. We derive general expressions and
consider in detail specific regions of parameters which allow simple asymptotic
expansion. We take into account the recoil effects and anomalous magnetic
moment in the case of an antiproton as the orbiting particle
Hadronic Vacuum Polarization Contribution to the Muonium Hyperfine Splitting
We discuss hadronic effects in the muonium hyperfine structure and derive an
expression for the hadronic contribution to the hfs interval in form of the
one-dimensional integral of the cross section of e+e- annihilation into
hadrons. Higher-order hadronic contributions are also considered
Comments to On the Accuracy of Lamb Shift Measurements in Hydrogen (Physica Scripta, 55 (1997) 33-40) by V. G. Pal'chikov, Yu. L. Sokolov, and V. P. Yakovlev
The work is a comments on the article of V. G. Pal'chikov, Yu. L. Sokolov,
and V. P. Yakovlev, devoted to the measurement of the Lamb shift in the
hydrogen atom and published in Physica Scripta, 55 (1997) 33-40.Comment: 4 pages; [email protected]
Constraints on a long-range spin-dependent interaction from precision atomic physics
We present a phenomenological constraint on a pseudovector light boson beyond
the Standard Model, which can induce a long-range spin-dependent interaction
. In
the range of masses from to those related to macroscopic
distances (of cm) the spin-dependent coupling constant
of the electron-muon interaction is constrained at the
level below a part in . The constraint is weakened while extending to
higher masses. The strongest constraint is related to the lepton-lepton
interaction. Constraints on spin-dependent interactions of some other particles
are also discussed. The results are obtained from data on the HFS interval of
the ground state in muonium and a few other light hydrogen-like atoms.Comment: Cross references to Arxiv are updated (arXiv:1005.4859,
arXiv:1005.4872
Three-Loop Radiative-Recoil Corrections to Hyperfine Splitting in Muonium: Diagrams with Polarization Loops
We consider three-loop radiative-recoil corrections to hyperfine splitting in
muonium generated by the diagrams with electron and muon vacuum polarizations.
We calculate single-logarithmic and nonlogarithmic contributions of order
generated by gauge invariant sets of diagrams with electron
and muon polarization insertions in the electron and muon factors. Combining
the new contributions with our older results we present complete result for all
three-loop radiative-recoil corrections generated by the diagrams with electron
and muon polarization loops.Comment: 8 pages, 10 figures. Editorial changes, results unchanged. Version
published in Phys.Rev.Let
Precision Optical Measurements and Fundamental Physical Constants
A brief overview is given on precision determinations of values of the
fundamental physical constants and the search for their variation with time by
means of precision spectroscopy in the optical domain
The Uehling correction to the energy levels in a pionic atom
We consider a correction to energy levels in a pionic atom induced by the
Uehling potential, i.e., by a free electron vacuum-polarization loop. The
calculation is performed for circular states (l=n-1). The result is obtained in
a closed analytic form as a function of and the pion-to-electron
mass ratio. Certain asymptotics of the result are also presented
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