منابع مشابه
Strange Mesonic Transition Form Factor in the Chiral Constituent Quark Model
The form factor g (S) ρπ (Q2) of the strange vector current transition matrix element 〈ρ|s̄γμs|π〉 is calculated within the chiral quark model. A strange vector current of the constituent U andD-quarks is induced by kaon radiative corrections and this mechanism yields the nonvanishing values of g (S) ρπ (0). The numerical result at the photon point is consistent with the one given by the φ-meson ...
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The strange-quark vector current ρ-to-π meson transition form factor is computed at one-loop order using strange meson intermediate states. A comparison is made with a φ-meson dominance model estimate. We find that one-loop contributions are comparable in magnitude to those predicted by φ-meson dominance. It is possible that the one-loop contribution can make the matrix element as large as thos...
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The pion electromagnetic form factor is often considered a good observable for studying the relative accuracy of perturbative and nonperturbative descriptions of QCD as the energy scale varies. It is hoped that because the pion is the lightest and simplest hadron that perturbative descriptions will remain accurate at lower energy scales than predictions for heavier and more complicated hadrons,...
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The ηcγ transition form factor is calculated in a model based on a modified hard scattering approach to exclusive reactions, in which transverse degrees of freedom are taken into account. For the ηc-meson a distribution amplitude of the Bauer-Stech-Wirbel type is used, where the two free parameters, namely the decay constant fηc and the transverse size of the wave function, are related to the F...
متن کاملImportance of multi-mesonic fusion processes on (strange) antibaryon production
Sufficiently fast chemical equilibration of (strange) antibaryons in an environment of nucleons, pions and kaons during the course of a relativistic heavy ion collision can be understood by a ‘clustering’ of mesons to buildt up baryon-antibaryon pairs. This multi-mesonic (fusion-type) process has to exist in medium due to the principle of detailed balance. Novel numerical calculations for a dyn...
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ژورنال
عنوان ژورنال: Physical Review C
سال: 1996
ISSN: 0556-2813,1089-490X
DOI: 10.1103/physrevc.53.399