The onset of spin rotation effects in electroproduction of heavy quarkonia

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 potent...

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Published in2019 European Physical Society Conference on High Energy Physics, EPS-HEP 2019,Ghent, Belgium,2019-07-10 - 2019-07-17 Vol. 364
Main Authors Krelina, M., Nemchik, J., Pasechnik, R., Cepila, J.
Format Conference Proceeding
LanguageEnglish
Published 2019
Subjects
Fysik
Natural Sciences
Naturvetenskap
Physical Sciences
Subatomic Physics
Subatomär fysik
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Summary: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.
ISSN:1824-8039
1824-8039
DOI:10.22323/1.364.0496