Charmonium production in fixed-target experiments with SPS and LHC beams at CERN |
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Authors: | A B Kurepin N S Topilskaya M B Golubeva |
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Institution: | 1.Institute for Nuclear Research,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The possibility of measuring cross sections for the production of J/ψ mesons in fixed-target experiments with the proton and ion beams of the Large Hadron Collider (LHC) at CERN (Switzerland)
is considered. At the present time, measurements of charmonium production in proton-proton collisions at an energy of 7 TeV
have begun at LHC. Previously, the production of J/ψ and ψ′ mesons was studied in the NA38, NA50, and NA60 fixed-target experiments with beams of the CERN synchrotron (SPS) and in the
PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC, Brookhaven National Laboratory, USA). A normal nuclear absorption
of J/ψ mesons in proton-nucleus collisions and an enhanced, anomalous, suppression of the production of charmonium states in central
collisions of relativistic nuclei were observed. At the present time, there are no theoretical models that could describe
the entire body of experimental data. Measurements over a broad interval of proton and ion energies are required. Measurements
of charmonium production using LHC beams with fixed targets in the energy range between the SPS and RHIC energies-a beam of
7-TeV protons (√s = 114.6 GeV) and a beam of 2.75-TeV/nucleon lead ions (√s = 71.8 GeV)-will provide an additional possibility for studying the charmonium-production mechanism. Estimates of the geometric
acceptance, luminosity, and counting rate for the production of J/ψ mesons are presented. |
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