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Spin rotation effects in diffractive electroproduction of heavy quarkonia
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- Krelina, Michal (författare)
- Czech Technical University in Prague,Federico Santa Maria Technical University
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- Nemchik, Jan (författare)
- Czech Technical University in Prague
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- Pasechnik, Roman (författare)
- Lund University,Lunds universitet,Teoretisk partikelfysik - Geonomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Theoretical Particle Physics - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science,Federal University of Santa Catarina,Nuclear Physics Institute of the Academy of Sciences, Czech Republic
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- 2019-02-20
- 2019
- Engelska.
- Ingår i: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 79:2
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- 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 Schrödinger 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 ψ ′ (2 S) these effects are even stronger leading to an increase of the photoproduction cross section by a factor of 2 ÷ 3 depending on the photon energy. Even in production of radially excited Υ ′ (2 S) and Υ ′ ′ (3 S) 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 Q 2 following universality properties in production of different heavy quarkonia as a function of Q2+MV2.
Ämnesord
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
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- Krelina, Michal
- Nemchik, Jan
- Pasechnik, Roman
- Čepila, Jan
- Om ämnet
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- NATURVETENSKAP
- NATURVETENSKAP
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- Lunds universitet
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