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Near-threshold J/ψ-meson photoproduction on nuclei

  • Elementary Particles and Fields
  • Theory
  • Published:
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Abstract

On the basis of the first-collision model that relies on the nuclear spectral function and which includes incoherent processes involving charmonium production in proton–nucleon collisions, the photoproduction of J/ψ mesons on nuclei is considered at energies close to the threshold for their production on a nucleon. The absorption of final J/ψ mesons, their formation length, and the binding and Fermi motion of target nucleons are taken into account in this model along with the effect of the nuclear potential on these processes. The A dependences of the absolute and relative charmonium yields are calculated together with absolute and relative excitation functions under various assumptions on the magnitude of the cross section for J/ψN absorption, the J/ψ-meson formation length, and their inmedium modification. It is shown that, at energies above the threshold, these features are virtually independent of the formation length and the change in the J/ψ-meson mass in nuclear matter but are rather highly sensitive to the cross section for J/ψN interaction. The calculations performed in the present study can be used to determine the unknown cross section for J/ψ-meson absorption in nuclei from a comparison of their results with data expected from experiments in the Hall C of the CEBAF (USA) facility upgraded to the energy of 12 GeV. It is also shown that the absolute and relative excitation functions for J/ψ mesons in photon–nucleus reactions at subthreshold energies are sensitive to the change in the meson mass and, hence, carry information about the properties of charmonium in nuclear matter.

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Authors and Affiliations

  1. Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312, Russia

    E. Ya. Paryev

  2. Institute for Theoretical and Experimental Physics, National Research Centre Kurchatov Institute, Bol’shaya Cheremuskinskaya ul. 25, Moscow, 117218, Russia

    E. Ya. Paryev & Yu. T. Kiselev

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  1. E. Ya. Paryev
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  2. Yu. T. Kiselev
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Correspondence to Yu. T. Kiselev.

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Original Russian Text © E.Ya. Paryev, Yu.T. Kiselev, 2017, published in Yadernaya Fizika, 2017, Vol. 80, No. 1, pp. 70–80.

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Paryev, E.Y., Kiselev, Y.T. Near-threshold J/ψ-meson photoproduction on nuclei. Phys. Atom. Nuclei 80, 67–76 (2017). https://doi.org/10.1134/S1063778817010148

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