Results 241 to 250 of about 215,997 (253)

Quark model and the triton

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 Quark Model for Baryons

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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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, 2011
We 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, Elena Santopinto, Alejandro Ayala, Guillermo Contreras, Ildefonso Leon, Pedro Podesta   +5 more
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Heavy-quark mesons in a relativistic quark model

Physical Review D, 1991
The 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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Massive quarks and the quark-parton model

Physical Review D, 1974
The 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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Deuteron photodisintegration and quark models

Physical Review C, 1990
We 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, L.A. Kondratyuk, A.B. Kaidalov   +2 more
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Ideal quarks and mesons in the relativistic quark model

Physical Review C, 1994
We 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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The nonrelativistic quark model

Uspekhi Fizicheskih Nauk, 1968
CONTENTS Introduction I. The Nonrelativistic Quark Model and the Classification of Hadrons 109 II. Mass Formulas in the Quark Model 110 III. Electromagnetic Properties of Hadrons 112 IV. Weak Interactions of Hadrons 115 V. Scattering of High-energy Particles (Description of the Model) 116 VI.
L. L. Frankfurt, E.M. Levin
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The Simplest Quark Model

Science, 1974
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