Results 251 to 260 of about 1,229,152 (264)
Reports on Progress in Physics, 1978 The quark model is reviewed in a version which includes three colours and at least five quark flavours. Methods are discussed which are applicable to any number of flavours, provided the underlying symmetry is SU(n). The relation between quark bound states and hadron spectroscopy is discussed, and sum rules are given for baryon magnetic moments and ...
D B Lichtenberg, A W Hendry
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Quark-Quark Interaction and the Nonrelativistic Quark Model
Physical Review Letters, 1980This Letter demonstrates that the nonrelativistic approximation breaks down for the lighter hadrons with the conventional $\mathrm{qq}$ one-gluon exchnage potential. This is mainly due to the Coulomb and the short-range hyperfine interactions. To overcome this difficulty, some phenomenological interactions with a long-range spin dependence are proposed.
Y. Nogami +2 more
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Physical Review C, 1988
The Virginia NN potential, which is based on an effective quark interchange mechanism at medium and long distances and is supplemented by a six-quark core potential with a P-matrix type parametrization, is used for calculating the triton binding energy.
T. Sasakawa, S. Ishikawa, T. Inaba
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The Virginia NN potential, which is based on an effective quark interchange mechanism at medium and long distances and is supplemented by a six-quark core potential with a P-matrix type parametrization, is used for calculating the triton binding energy.
T. Sasakawa, S. Ishikawa, T. Inaba
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International Journal of Modern Physics E, 1992
This is an elementary introduction to Quark Models for Baryons. The emphasis is on quick ways of computing matrix elements, especially for axial vector currents and magnetic moments. Various ways of expressing baryon wavefunctions are discussed, especially for the spin-flavor part, and some short explanations for orbital wavefunctions and negative ...
Gabriel Karl, Gabriel Karl
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This is an elementary introduction to Quark Models for Baryons. The emphasis is on quick ways of computing matrix elements, especially for axial vector currents and magnetic moments. Various ways of expressing baryon wavefunctions are discussed, especially for the spin-flavor part, and some short explanations for orbital wavefunctions and negative ...
Gabriel Karl, Gabriel Karl
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A quark statistical model for quark fragmentation [PDF]
Lettere al Nuovo Cimento, 1982 A simple model for fragmentation of a quark into a jet of hadrons is presented. It is based on a quark statistical consideration and treats both mesons and baryons on equal footing.
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Quark-antiquark pairs in the quark model
AIP Conference Proceedings, 2011We study the structure of the spin of the proton and the Λ hyperon in an unquenched quark model which incorporates the effects of quark‐antiquark pair creation via a microscopic, QCD‐inspired, quark‐antiquark creation mechanism. It is shown that the inclusion of the qq pairs leads to a sizeable contribution of the orbital angular momentum to the spin ...
Roelof Bijker +5 more
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Massive quarks and the quark-parton model
Physical Review D, 1974The parton-model result $\ensuremath{\nu}{W}_{2}(x)=\ensuremath{\Sigma}{i}^{}{{e}_{i}}^{2}x{f}_{i}(x)$ is derived for massive quarks in the case where partons are identified as quarks. A simple model of a bound-quark system is also given in order to illuminate the ideas behind the derivation.
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Heavy-quark mesons in a relativistic quark model
Physical Review D, 1991The Coulomb-gauge QCD Hamiltonian, augmented by a term which produces linear, scalar confinement is used to generate kernels for the bound-state amplitudes and eigenvalues of heavy quarkonium. The model generates all the correct perturbative physics up to order {alpha}{sub {ital s}}{sup 4} and is applied to the {ital c{bar c}} and {ital b{bar b ...
Roman Koniuk, Tao Zhang
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Ideal quarks and mesons in the relativistic quark model
Physical Review C, 1994We propose a microscopic theory for interacting mesons and ideal quarks in the relativistic quark model using the time-dependent mean-field theory technique. For simplicity we examined the Nambu--Jona-Lasinio model. The dynamical chiral-symmetry breaking leads to a zero-frequency mode (pion) due to the restoration of chiral symmetry.
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Deuteron photodisintegration and quark models
Physical Review C, 1990We have examined the behavior of the forward-to-backward ratio {ital R} of the cross section for the {sup 2}H({gamma},{ital p}){ital n} reaction. The data show a weak dependence of {ital R} on the photon energy and group around a value of 1.5 which agrees with the prediction of a simple quark model.
E. De Sanctis +2 more
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