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  • 12.40.Aa  (1)
  • 13.25.−k  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    A study of meson-baryon couplings in the constituent quark model (1990)
    Springer
    The European physical journal 337 (1990), S. 451-463 
    Details
    ISSN: 1434-601X
    Keywords: 13.30.Eg ; 12.40.Aa ; 14.20.Gk
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Within the framework of the constituent quark model we discuss the effects of different types of meson-baryon-baryon vertex operators on the form factors and the coupling strengths of the lowest-lying positive and negative parity non-strange baryons. We compare the quark pair creation model (3P0-model) with the SU(6)-model in which mesons are treated as elementary fields that directly couple to the quarks. The latter model is employed both in the so-called static limit and in a modification motivated by Galilei invariance. It is demonstrated that the inclusion of non-static effects simulates some features of the3P0 vertex. Especially the reaction πN→ππN is found to be very sensitive to the different assumptions on the dynamics of theq¯q pair creation process. More indirect hints for the internal structure of the mesons might be obtained from the predicted asymmetry for the two form factors ofN→Δ+π andΔ→N+π, which occurs in the3P0-model, only.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01294983
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Quark-hadron duality and meson-meson scattering amplitudes (1995)
    Springer
    The European physical journal 351 (1995), S. 417-433 
    Details
    ISSN: 1434-601X
    Keywords: 12.39.−x ; 13.25.−k ; 13.75.Lb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We investigate a special concept of quarkhadron duality in meson physics at low and intermediate energies. With a relativistic propagator for confined quarks, we calculated masses and widths of the mesons which areS- andP-wave states ofq¯q (J P=0−, 1−, 0+, 1+c, 2+) as well as meson-meson scattering amplitudes at energies up totrs ≤ 1.3 GeV by including light pseudoscalar and vector mesons into the interaction dynamics. Our investigation shows that the influence of the light meson dynamics resutls in: 1. a contribution to the constituent quark mass of approximately 200 MeV. 2. the appearance of a new soft confinement force barrier responsible for the formation of the highly excited meson states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291148
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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