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Träfflista för sökning "(WFRF:(Krelina Michal)) srt2:(2019)"

Sökning: (WFRF:(Krelina Michal)) > (2019)

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1.
  • Cepila, Jan, et al. (författare)
  • Theoretical uncertainties in exclusive electroproduction of S-wave heavy quarkonia
  • 2019
  • Ingår i: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 79:6
  • Tidskriftsartikel (refereegranskat)abstract
    • In this work, we revise the conventional description of J/ ψ(1 S) , Υ (1 S) , ψ′(2 S) and Υ ′(2 S) elastic photo- and electroproduction off a nucleon target within the color dipole picture and carefully study various sources of theoretical uncertainties in calculations of the corresponding electroproduction cross sections. For this purpose, we test the corresponding predictions using a bulk of available dipole cross section parametrisations obtained from deep inelastic scattering data at HERA. Specifically, we provide the detailed analysis of the energy and hard-scale dependencies of quarkonia yields employing the comprehensive treatment of the quarkonia wave functions in the Schrödinger equation based approach for a set of available c- c¯ and b- b¯ interquark interaction potentials. Besides, we quantify the effect of Melosh spin rotation, the Q2-dependence of the diffractive slope and an uncertainty due to charm and bottom quark mass variations.
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2.
  • Krelina, Michal, et al. (författare)
  • Spin rotation effects in diffractive electroproduction of heavy quarkonia
  • 2019
  • Ingår i: European Physical Journal C. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 79:2
  • Tidskriftsartikel (refereegranskat)abstract
    • 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.
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  • Resultat 1-2 av 2
Typ av publikation
tidskriftsartikel (2)
Typ av innehåll
refereegranskat (2)
Författare/redaktör
Pasechnik, Roman (2)
Cepila, Jan (2)
Krelina, Michal (2)
Nemchik, Jan (2)
Lärosäte
Lunds universitet (2)
Språk
Engelska (2)
Forskningsämne (UKÄ/SCB)
Naturvetenskap (2)
År
2019 (2)Ta bort avgränsningen

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