Spin rotation effects in diffractive electroproduction of heavy quarkonia

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389005%3A_____%2F19%3A00503168" target="_blank" >RIV/61389005:_____/19:00503168 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21340/19:00329677
Result on the web
<a href="https://doi.org/10.1140/epjc/s10052-019-6666-y" target="_blank" >https://doi.org/10.1140/epjc/s10052-019-6666-y</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1140/epjc/s10052-019-6666-y" target="_blank" >10.1140/epjc/s10052-019-6666-y</a>

Result language
angličtina
Original language name
Spin rotation effects in diffractive electroproduction of heavy quarkonia
Original language description
In this work we present for the first time the comprehensive study of the Melosh spin rotation effects in diffractive electroproduction of S-wave heavy quarkonia off a nucleon target. Such a study has been performed within the color dipole approach using, as an example and a reference point, two popular parametrizations of the dipole cross section and two potentials describing the interaction between Q and Q and entering in the Schrodinger equation based formalism for determination of the quarkonia wave functions. We find a strong onset of spin rotation effects in 1S charmonium photoproduction which is obviously neglected in present calculations of corresponding cross sections. For photoproduction of radially excited (2S) these effects are even stronger leading to an increase of the photoproduction cross section by a factor of 2 divided by 3 depending on the photon energy. Even in production of radially excited ?(2S) and ?(3S) they can not be neglected and cause the 20-30% enhancement of the photoproduction cross section. Finally, we predict that the spin effects vanish gradually with photon virtuality Q2 following universality properties in production of different heavy quarkonia as a function of Q2+MV2.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10303 - Particles and field physics

Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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