We calculate the cross section for the dissociation of J / by kaons within the framework of a mesonexchange model including anomalous parity interactions. Off-shell effects at the vertices were handled with QCD sum rule estimates for the running coupling constants. The total J / -kaon cross section was found to be 1.0-1.6 mb for 4.1ഛ ͱ s ഛ 5 GeV.
Este trabalho expõe uma dedução da intensidade da luz espalhada por pequenas partículas na atmosfera, o que explica o porquê do azul do céu e o vermelho do pôr-do-sol. Mostramos, também, uma experiência bem simples, sobre os temas abordados, que foi elaborada com o intuito de aplicar a alunos do Ensino Médio
We calculate the cross section for the dissociation of J/ψ by kaons within the framework of a meson exchange model. We find that, depending on the values of the coupling constants used, the cross section can vary from 5 mb to 30 mb at √ s ∼ 5 GeV.In relativistic heavy ion collisions J/ψ suppression has been recognized as an important tool to identify the possible phase transition to quark-gluon plasma (QGP) [1] (for a review of data and interpretations see refs. [2,3]). Since there is no direct experimental information on J/ψ absorption cross sections by hadrons, several theoretical approaches have been proposed to estimate their values. In order to elaborate a theoretical description of the phenomenon, we have first to choose the relevant degrees of freedom. Some approaches were based on charm quark-antiquark dipoles interacting with the gluons of a larger (hadron target) dipole [4][5][6] or quark exchange between two (hadronic) bags [7,8], or QCD sum rules [9][10][11], whereas other works used the meson exchange mechanism [12][13][14][15][16][17]. In this case it is not easy to decide in favor of quarks or hadrons because we are dealing with charm quark bound states, which are small and massive enough to make perturbation theory meaningful, but not small enough to make non-perturbative effects negligible [9][10][11]18].The meson exchange approach was applied basically to J/ψ −π and J/ψ −ρ cross sections, with the only exception of ref. [13] where J/ψ −K cross section was also estimated.
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