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  • 1990-1994  (4)
  • 1985-1989  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Hadron spectroscopy with instanton induced quark forces (1990)
    Springer
    The European physical journal 337 (1990), S. 327-335 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 12.40.Qq ; 14.20.-c
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract It is shown that within the framework of a non-relativistic quark model with string-like confinement and an instanton induced residual quark-quark interaction it is possible to account simultaneously for the baryon and the meson spectra, including theπ- η- η′ splitting for pseudoscalar mesons, up to energies of roughly 2 GeV.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289701
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 13.30.Eg ; 12.40.Aa ; 14.20.Gk
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01294983
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Pion production in nuclear collisions (1991)
    Springer
    The European physical journal 340 (1991), S. 399-410 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 21.10.−k ; 24.90.+d ; 25.10.+s ; 25.70.−z
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The production of pions in nuclear collisions is analyzed in terms of a microscopic reaction model, where the free energy of the entrance channel is transferred to the final channel through the coupling of the relative motion to the internal excitation of N*-resonances. Such a model allows quite naturally for a consistent analysis of the exclusive and the inclusive production of pions. It turns out that the pionic fusion cross section is determined predominantly by the spectroscopic parentage between the initial target projectile combination and the final nucleus, whereas the inclusive part is dominated by the energy dependence of the phase space factor, i.e. by the number of the degrees of freedom which are relevant in a given kinematical situation. This model is applied to the analysis of available experimental data from threshold to the Δ(1232)-region. A consistent analysis of both the inclusive and the exclusive part of the pion spectrum is presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01290328
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  • 4
    Digitale Medien
    Digitale Medien
    Relativistic effects and the constituent quark model of heavy quarkonia (1992)
    Springer
    The European physical journal 55 (1992), S. 307-315 
    Details
    ISSN: 1434-6052
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Charmonium $$c\bar c$$ and bottomonium $$b\bar b$$ are investigated in the framework of a constituent quark model. A scalar confining and a one-gluon exchange (OGE) potential are used in a nonrelativistic reduction to order (p/m)2. Therefore the model includes spin dependent as well as spin independent terms. Their influence on the meson mass spectra and decay widths is analysed. We find that the experimental spectra can be reproduced by using a full model as well as by using a reduced version neglecting the spin independent terms. For both versions we calculate leptonic and radiative decay widths including relativistic corrections for the current operators. We find that for leptonic decays inclusion of all terms of the OGE potential gives better results than the non-relativistic formulas. For radiative transitions relativistic corrections are important.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01482594
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  • 5
    Digitale Medien
    Digitale Medien
    Baryon resonances as bound (q)3-states coupled to meson fields (1987)
    Springer
    The European physical journal 326 (1987), S. 413-420 
    Details
    ISSN: 1434-601X
    Schlagwort(e): 12.40.Qq ; 13.30.Eg ; 14.20.−c
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Within the framework of the non-relativistic quark model (NRQM) we discuss the influence of the coupling between baryonic excitations and meson fields. This leads to the interpretation of the baryon resonances as bound (q)3-configurations embedded in the corresponding meson-baryon continua. This concept is formulated analytically and applied to the description of the low-lying (N=0)- and (N=1)-multiplets with strangeness (S=0) and (S=−1). It turns out that the effects of this coupling are comparable in size to the effects induced by the hyperfine interaction. In particular, a remarkable cancellation of the spin-orbit forces of theqq-interaction and the meson-baryon interaction is observed. The implications of the strong baryon-meson coupling on the baryon-baryon interaction and on the formulation of the Hamiltonian for a multibaryon system are briefly discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01289545
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