共查询到20条相似文献,搜索用时 15 毫秒
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D. B. Lichtenberg E. Predazzi J. G. Wills 《Zeitschrift fur Physik C Particles and Fields》1983,17(1):57-60
The magnetic moments of baryons are calculated in a dynamical quark-diquark model using current-quark masses as input. Except for theΞ ? moment, results are in fairly good agreement with experiment. 相似文献
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Ground-state baryon magnetic moments and nucleon axial vector coupling are calculated usingqcd inspired configuration mixing and relativistic corrections. Unlike earlier attempts, we incorporate a natural mass scale
for quarks, taken as one third the nucleon mass for up and down quarks, and the strange quark mass suggested by the Lipkin’s
sum rule. In the parameter-free non-relativistic limit, we find a fairly good fit, which improves upon including relativistic
corrections. 相似文献
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《Nuclear Physics A》1988,489(4):557-611
The weak interaction form factors and the magnetic moments of the octet baryons are calculated in the volume-type cloudy bag model including clouds of all the octet mesons. In addition, one-gluon exchange effects are also evaluated. The theoretical predictions including both the mesonic and gluonic effects are compared, wherever possible, with experimental data. 相似文献
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In this work we use the Nambu-Jona-Lasinio (NJL) model as an effective quark theory based on QCD to describe the structure of baryons. Based on the solutions of the relativistic 3-quark Faddeev equation in the ladder approximation, we discuss the masses of the nucleon and the delta, the static properties of the nucleon, and the quark light cone momentum distributions in the nucleon. 相似文献
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Using the single particle states and the residual interaction derived from the relativistic point-coupling model with the PC-F1 parameter set,the second-order core polarization corrections to nuclear magnetic moments of LS closed shell nuclei ±1 nucleon with A = 15,17,39 and 41 are studied and compared with previous non-relativistic results.It is found that the second-order corrections are significant.With these corrections,the isovector magnetic moments of the concerned nuclei are well reproduced,especiall... 相似文献
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We present a broken SU(3) gauge model of strong and electromagnetic interactions with the usual vector mesons. All particles (9 vectors, 8 baryons and 9 pseudoscalars) have the right masses by means of the Higgs mechanism. We study the consequences of Sakuraï's idea that strong and electromagnetic interactions are mediated by vector mesons universally coupled to nearly conserved currents: one finds encouraging values for scattering lengths except for P-wave parameters in the meson-baryon sector that are too small. The calculation of the baryon anomalous magnetic moments also gives too-small numbers. 相似文献
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Recoil corrections to magnetic moments of charmed baryons are studied in themit bag model. It is noticed that such corrections which improve the octet baryon magnetic moments have considerably significant
contributions to charmed baryon’s moments also. 相似文献
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The magnetic moments of charmed baryons are studied in the covariant oscillator quark model including isospin symmetry breaking
effect. In the uncharmed sector, the results differ from those obtained using conventional non-relativistic quark model (nrqm). But in the charmed sector the present values are much nearer to thenrqm results than those calculated using models with hadron mass dependence. 相似文献
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W-Y. P. Hwang 《Zeitschrift fur Physik C Particles and Fields》1983,16(4):327-330
The presence of certain recoil corrections in the determination of baryon magnetic moments is described and taken into account for the octet members. Inclusion of these recoil corrections makes the MIT bag model, even in its zeroth-order version, very appealing, if the sum of many other corrections is not important by comparison. 相似文献
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It is shown that the original version of the sum rule relating the isovector part of the nucleon magnetic moment to aπ N scattering amplitude is not consistent with the experimental data. However there is good agreement for the corrected version ofMaiani andPreparata. 相似文献
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Incorporating the lowest-order pionic correction, the magnetic moments of the nucleon octet have been calculated in a chiral
potential model. The potential, representing phenomenologically the nonperturbative gluon interactions including gluon self-couplings,
is chosen with equally mixed scalar and vector parts in a power-law form. The results are in reasonable agreement with experiment. 相似文献
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I. C. Cloët G. Eichmann V. V. Flambaum C. D. Roberts M. S. Bhagwat A. Höll 《Few-Body Systems》2008,42(1-4):91-113
A calculation of the current quark-mass dependence of nucleon static electromagnetic properties is necessary in order to use observational data as a means to place constraints on the variation of Nature’s fundamental parameters. A Poincaré-covariant Faddeev equation, which describes baryons as composites of confined quarks and nonpointlike diquarks, is used to calculate this dependence. The results indicate that, like observables dependent on the nucleons’ magnetic moments, quantities sensitive to their magnetic and charge radii, such as the energy levels and transition frequencies in hydrogen and deuterium, might also provide a tool with which to place limits on the allowed variation in Nature’s constants. 相似文献