J/ψ-Nucleon Scattering Length and In-Medium Mass Shift of J/ψ in QCD Sum Rule Analysis : Nuclear Physics

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概要

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• We calculate the spin-averaged J/ψ-nucleon scattering length a_<J/ψ> by directly applying the QCD sum rule to the J/ψ-N forward scattering amplitude. Our result, a_<J/ψ> = -0.10±0.02 fm, implies the possibility of bound states with nuclei, though the force is weaker than that of the light vector mesons (ρ,ω,φ)-N cases. Up to dimension-4 gluonic operators, we evaluate the scattering length with a twist-2 contribution. This increases the absolute value of the scattering length by about 30%. If we apply a_<J/ψ> to the effective mass of J/ψ in nuclear matter on the basis of the linear density approximation, it exhibits very slight decrease (4-7 MeV) at normal matter density.

• 理論物理学刊行会の論文
• 1999-04-25

著者

• Hayashigaki Arata

  Yukawa Institute For Theoretical Physics Kyoto University

• HAYASHIGAKI Arata

  Yukawa Institute for Theoretical Physics, Kyoto University

関連論文

• J/ψ-Nucleon Scattering Length and In-Medium Mass Shift of J/ψ in QCD Sum Rule Analysis : Nuclear Physics

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