The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here:

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Typical working day..

Roman Pasechnik

Senior lecturer

Typical working day..

The onset of spin rotation effects in electroproduction of heavy quarkonia


  • M. Krelina
  • J. Nemchik
  • R. Pasechnik
  • J. Cepila

Summary, in English

We discuss the Melosh spin rotation effects in diffractive photo- and electroproduction of heavy quarkonia off a nucleon target in the dipole picture. The quarkonium light-front wave functions are obtained in the Schroedinger equation based formalism using the realistic interquark interaction potentials. A strong onset of spin rotation effects predicted in the case of J/ψ(1S) photoproduction enables us to reach a reasonable agreement with the available data. In the case of radially excited 2S and 3S states these effects are even stronger as a direct manifestation of the nodal structure of their wave functions. In particular, the spin effects enhance the Ψ0(2S) cross section by a factor of 2 − 3 and therefore cause a substantial increase of the Ψ0(2S)-to-J/Ψ(1S) ratio improving the description of experimental data.


  • Theoretical Particle Physics

Publishing year





Proceedings of Science



Document type

Conference paper


  • Subatomic Physics

Conference name

2019 European Physical Society Conference on High Energy Physics, EPS-HEP 2019

Conference date

2019-07-10 - 2019-07-17

Conference place

Ghent, Belgium




  • ISSN: 1824-8039