2010
DOI: 10.1103/physrevd.82.113011
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Isospin symmetry breaking in the chiral quark model

Abstract: We discuss the isospin symmetry breaking (ISB) of the valence-and sea-quark distributions between the proton and the neutron in the framework of the chiral quark model. We assume that isospin symmetry breaking is the result of mass differences between isospin multiplets and then analyze the effects of isospin symmetry breaking on the Gottfried sum rule and the NuTeV anomaly.We show that, although both flavor asymmetry in the nucleon sea and the ISB between the proton and the neutron can lead to the violation o… Show more

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Cited by 6 publications
(5 citation statements)
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“…As can be seen in this figure, the absolute amount of 'mesonic' and 'gluonic' parts of the polarized quark densities grow by increasing the cut-off parameter value. This behaviour is also seen in [18].…”
Section: Resultssupporting
confidence: 65%
See 1 more Smart Citation
“…As can be seen in this figure, the absolute amount of 'mesonic' and 'gluonic' parts of the polarized quark densities grow by increasing the cut-off parameter value. This behaviour is also seen in [18].…”
Section: Resultssupporting
confidence: 65%
“…The cut off parameter, Λ χ , is determined by the experimental data, concerning the Gottfried sum rule [17,18]. We can find in [19,20] other numerical values for ′ g A based on different approaches.…”
Section: Unpolarized Parton Distributions In the Chiral Quark Modelmentioning
confidence: 99%
“…In this model, the minor effects of the internal gluons are neglected, and the valence quarks contained in the nucleon fluctuate into quarks plus Goldstone bosons, which spontaneously break the chiral symmetry. This model is successful in explaining a number of problems, including the violation of the Gottfried sum rule from the aspect of the flavor asymmetry in the nucleon sea [12][13][14], the NuTeV anomaly resulting from the strange-antistrange asymmetry [15], and the isospin symmetry breaking between the proton and the neutron [16]. It is also proposed by Cheng and Li [17] that the proton spin problem can be accounted for by the quark splitting into a quark plus a Goldstone boson in the chiral quark model from an intuitive argument.…”
Section: Chiral Quark Modelmentioning
confidence: 99%
“…It has been known that the relativistic effect due to transversal motions of quarks [15,16,17,18,19] and the sea content of the nucleon [20] play important roles to understand the proton spin problem. A number of models concerning the sea content of the nucleon, such as the baryon-meson fluctuation model [21] and the chiral quark model [22,23], not only play significant roles to understand the proton spin structure [20,21,24], but also show their remarkable significance to explain the flavor asymmetry of the nucleon sea [21,25,26,27] reported by the NMC collaboration [28,29]. More interestingly, the baryon-meson fluctuation model and the chiral quark model have been also found to produce a strange-antistrange asymmetry of the nucleon, and such strangeness asymmetry with natural model estimations [30,31,32] can explain the NuTeV anomaly [33,34] of the deviation of the NuTeV measured value of weak mixing angle compared with other measurements.…”
mentioning
confidence: 99%
“…Furthermore, the meson-baryon fluctuations of the nucleon sea produce a striking quark/antiquark asymmetry in the momentum distributions for the nucleon strangeness, and such asym- metry provides a natural explanation [30] of the NuTeV anomaly within the standard model. The intrinsic quarks of the nucleon sea can be also alteratively modeled by the chiral quark model [27,31], and all of the above mentioned anomalies can be also understood as well.…”
mentioning
confidence: 99%