Zobrazeno 1 - 10
of 74
pro vyhledávání: '"Krachkov, P. A."'
We discuss the single-quantum positron annihilation with a bound electron in the near threshold region. The angular distribution and the total cross section are considered. We obtain a simple analytical expression for the Coulomb potential and for th
Externí odkaz:
http://arxiv.org/abs/2409.20061
Autor:
Krachkov, P. A.
Publikováno v:
Phys. Rev. D 109, 076002 (2024)
In the present paper, we consider processes involving the emission of soft photons in the presence of a strong laser field. We demonstrate that the matrix element $S$ for a process $\text{i} \rightarrow \text{f} + \gamma$, with a soft photon $\gamma$
Externí odkaz:
http://arxiv.org/abs/2312.17477
Autor:
Krachkov, Petr A., Lee, Roman N.
We derive an analytical expression for the contribution of the order $m\alpha^2 (Z\alpha)^6$ to the hydrogen Lamb shift which comes from the diagrams for radiative corrections to the Wichmann-Kroll potential. We use modern methods of multiloop calcul
Externí odkaz:
http://arxiv.org/abs/2311.05860
Autor:
Krachkov, P. A., Milstein, A. I.
The effect of screening by atomic electrons on the behavior of electron and positron wave functions in the continuous spectrum at small distances is studied. It is shown that these asymptotics are affected not only by the static potential of atomic e
Externí odkaz:
http://arxiv.org/abs/2307.03383
Autor:
Krachkov, Petr A., Lee, Roman N.
We revisit the contributions of order $\alpha^2(Z\alpha)^5m$ and $\alpha^2(Z\alpha)E_F$, respectively, to the Lamb shift and to the hyperfine splitting from mixed self-energy-vacuum-polarization diagrams, involving fermionic loop. We use modern multi
Externí odkaz:
http://arxiv.org/abs/2306.13369
It is shown that the influence of the undulator field on the motion of a relativistic electron leads to a significant increase of the bremsstrahlung cross section on an atom near the end of the spectrum of undulator radiation. Observation of this eff
Externí odkaz:
http://arxiv.org/abs/2212.12172
Autor:
Krachkov, Petr A., Lee, Roman N.
We calculate the first Coulomb correction to the spectra of two processes: the electron bremsstrahlung and electron-positron photoproduction in the Coulomb field. We show that, in contrast to the results obtained in the Born approximation and in the
Externí odkaz:
http://arxiv.org/abs/2212.00978
We consider the electron-positron pair production by a photon in Coulomb field near threshold. We obtain the analytical results for the particle energy spectrum and angular distribution exactly in the parameter $Ze^2/\hbar v$. We show that Furry-Somm
Externí odkaz:
http://arxiv.org/abs/2209.03566
Autor:
Peter A. Krachkov, Simon V. Sorokin
Publikováno v:
Physics Letters B, Vol 859, Iss , Pp 139129- (2024)
We discuss the low-energy single-quantum positron annihilation with a bound electron. The angular distribution and the total cross section are considered. We obtain a simple analytical expression for the Coulomb potential and for the screened potenti
Externí odkaz:
https://doaj.org/article/b1a8fa468eb14260b4e945aa88c12060
Autor:
Petr A. Krachkov, Roman N. Lee
Publikováno v:
Journal of High Energy Physics, Vol 2023, Iss 12, Pp 1-9 (2023)
Abstract We derive an analytical expression for the contribution of the order mα 2(Zα)6 to the hydrogen Lamb shift which comes from the diagrams for radiative corrections to the Wichmann-Kroll potential. We use modern methods of multiloop calculati
Externí odkaz:
https://doaj.org/article/e29f18504d4b472c93e0f9fd21300638