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Title: Near-threshold J/ψ-meson photoproduction on nuclei

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 themore » 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.« less

Authors:
 [1];  [2]
  1. Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation)
  2. National Research Centre Kurchatov Institute, Institute for Theoretical and Experimental Physics (Russian Federation)
Publication Date:
OSTI Identifier:
22614000
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 80; Journal Issue: 1; Other Information: Copyright (c) 2017 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; ABSORPTION; CEBAF ACCELERATOR; CHARMONIUM; EXCITATION FUNCTIONS; GEV RANGE 10-100; NUCLEAR MATTER; NUCLEAR POTENTIAL; PHOTON-NUCLEON INTERACTIONS; PHOTONUCLEAR REACTIONS; PHOTOPRODUCTION; PROTON-NUCLEON INTERACTIONS; REST MASS; SPECTRAL FUNCTIONS; FUNDAMENTAL INTERACTIONS

Citation Formats

Paryev, E. Ya., and Kiselev, Yu. T., E-mail: yurikis@itep.ru. Near-threshold J/ψ-meson photoproduction on nuclei. United States: N. p., 2017. Web. doi:10.1134/S1063778817010148.
Paryev, E. Ya., & Kiselev, Yu. T., E-mail: yurikis@itep.ru. Near-threshold J/ψ-meson photoproduction on nuclei. United States. doi:10.1134/S1063778817010148.
Paryev, E. Ya., and Kiselev, Yu. T., E-mail: yurikis@itep.ru. Sun . "Near-threshold J/ψ-meson photoproduction on nuclei". United States. doi:10.1134/S1063778817010148.
@article{osti_22614000,
title = {Near-threshold J/ψ-meson photoproduction on nuclei},
author = {Paryev, E. Ya. and Kiselev, Yu. T., E-mail: yurikis@itep.ru},
abstractNote = {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.},
doi = {10.1134/S1063778817010148},
journal = {Physics of Atomic Nuclei},
number = 1,
volume = 80,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2017},
month = {Sun Jan 15 00:00:00 EST 2017}
}