Drawbacks of Applying Perturbative Schemes to Meson Spectroscopy(Particles and Fields)

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概要

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• We study meson-meson scattering in a soluble model which describes asymptotically free mesons and confined quark-antiquark pairs via coupled channels. Concretely, the two scattered mesons are assumed to interact through s-channel meson-exchange diagrams. Furthermore, we develop a perturbative expansion of the model, and show that the thus found resonance pole positions, including contributions up to fourth order in perturbation theory, progressively deviate from the exact results as the coupling between the quarks and mesons increases. This shows that the resonance predictions based on perturbative approximations in quark models may be reliable only in those cases where the coupling to the scattering channels is ⪅0.5, on a scale of 0 to 1.

• 2011-03-25

著者

• Khemchandani K.

  Centro De Fisica Computacional Departamento De Fisica Universidade De Coimbra:(present Office)resear

• BEVEREN Eef

  Centro de Fisica Computacional, Departamento de Fisica, Universidade de Coimbra

• RUPP George

  Centro de Fisica das Interaccoes Fundamentais, Instituto Superior Tecnico, Universidade Tecnica de L

• Beveren Eef

  Centro De Fisica Computacional Departamento De Fisica Universidade De Coimbra

• Rupp George

  Centro De Fisica Das Interaccoes Fundamentais Instituto Superior Tecnico Universidade Tecnica De Lis

• Van Beveren

  Centro De Fisica Computacional Departamento De Fisica Universidade De Coimbra

• RUPP George

  Centro de Fisica das Interaccoes Fundamentais, Instituto Superior Tecnico, Universidade Tecnica de Lisboa

• KHEMCHANDANI K.

  Centro de Fisica Computacional, Departamento de Fisica, Universidade de Coimbra:(Present office)Research Center of Nuclear Physics (RCNP)

関連論文

• Drawbacks of Applying Perturbative Schemes to Meson Spectroscopy(Particles and Fields)

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