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J/(psi) suppression in electro-and hadroproduction : a conventional physics explanation

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J/(psi) suppression in electro-and hadroproduction : a conventional physics explanation

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Título J/(psi) suppression in electro-and hadroproduction : a conventional physics explanation
Autor Doncheski, M.A.
Gay Ducati, Maria Beatriz
Halzen, Francis
Abstract Having in mind the importance of the phenomenon for the search for the quark-gluon plasma in the collision of heavy nuclei, we study the suppression of J/Ψ production in leptoproduction and hadroproduction on heavy nuclear targets. We here show that this phenomenon can be understood in terms of conventional physics, i.e., (i) perturbative QCD, (ii) the parton recombination implementation of shadowing in the initial state, (iii) the EMC efFect, and (iv) final state interactions of the produced J/Ψ with the hadronic debris of the nuclear target. Unlike previous calculations we include both the direct J/Ψ production and its production via radiative g decays (xj → J/Ψ + γ). We are able to reproduce the experimental data including their small-x behavior. We emphasize the importance of studying the xz dependence of the ratio σ(bA)/σ(bN), where b designates the beam and x2 is the momentum fraction of the parton from the nuclear target.
Contido em Physical Review. D, Particles and fields. Woodbury. Vol. 49, no. 3 (Feb. 1994), p. 1231-1236
Assunto Cromodinamica quantica
Fisica de particulas elementares e campos
Fisica nuclear
Hadrons
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/103707
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