Axial form factor of the nucleon in the perturbative chiral quark model

Khosonthongkee, K.; Lyubovitskij, Valery E.; Gutsche, Th.; Faessler, Amand; Pumsa-ard, Kem; Cheedket, S.; Yan, Yupeng

doi:10.1088/0954-3899/30/6/009

Cited by 21 publications

(26 citation statements)

References 42 publications

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“…These studies demonstrate the PCQM is one of the effective models in the low energy hadron physics, and indicate that the virtual meson cloud exists mainly outside of the quark core. But the PCQM theoretical results [3][4][5][6] of the electromagnetic and axial form factors of baryons are in good agreement with experimental data only at very low momentum transfer, descending quickly with the momentum transfer increasing. In those works, 3-6 a variational Gaussian ansatz have been employed for the quark wave function.…”

Section: Introductionsupporting

confidence: 66%

“…The perturbative chiral quark model (PCQM) was developed a decade ago 1, 2 and has been successfully applied to the electromagnetic and axial form factors of baryons, [3][4][5][6] etc. These studies demonstrate the PCQM is one of the effective models in the low energy hadron physics, and indicate that the virtual meson cloud exists mainly outside of the quark core.…”

Section: Introductionmentioning

confidence: 99%

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Study of baryon octet charge form factors in perturbative chiral quark model

Liu

Khosonthongkee

Limphirat

et al. 2014

Int. J. Mod. Phys. Conf. Ser.

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The charge form factors of baryon octet are studied in the perturbative chiral quark model (PCQM). The relativistic quark wave function is extracted by fitting the theoretical results of the nucleon charge form factors to the experimental data and the predetermined quark wave function is applied to study the charge form factors of other octet baryons. The PCQM results are found, based on the predetermined quark wave function, in good agreement with the experimental data.

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Section: Introductionsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Study of baryon octet charge form factors in perturbative chiral quark model

Liu

Khosonthongkee

Limphirat

et al. 2014

Int. J. Mod. Phys. Conf. Ser.

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“…However, the previous work on the axial form factor of the nucleon [30] shows that the PCQM theoretical result of the nucleon axial form factor is in good agreement with the experimental data only at very low momentum transfer Q 2 , descending quickly with the momentum transfer Q 2 increasing. It is noted that a variational Gaussian ansatz has been employed for the quark wave functions [30]. As we argue in Ref.…”

Section: Introductionmentioning

confidence: 63%

Meson cloud contributions to baryon axial form factors

Liu

Khosonthongkee²,

Limphirat³

et al. 2015

Phys. Rev. D

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The axial form factor as well as the axial charges and radii of octet N , Σ and Ξ baryons are studied in the perturbative chiral quark model with the quark wave functions predetermined by fitting the theoretical results of the proton charge form factor to experimental data. The theoretical results are found, based on the predetermined quark wave functions, in good agreement with experimental data and lattice values. This may indicate that the electric charge and axial charge distributions of the constituent quarks are the same. The study reveals that the meson cloud plays an important role in the axial charge of octet baryons, contributing 30%-40% to the total values, and strange sea quarks have a considerable contribution to the axial charges of the Σ and Ξ.

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“…The axial form factors of the octet baryons, including the nucleon, have been studied using constituent and chiral quark models [13,[25][26][27][28][29][30][31][32][33][34][35][36][37], based on the DysonSchwinger equations [38][39][40][41], models with meson cloud dressing [42][43][44][45][46][47][48][49][50][51][52][53][54], large-N C and chiral perturbation theory [5,[55][56][57][58][59][60][61][62][63][64][65] and QCD sum rules [66][67][68]. Recently, lattice QCD simulations for the nucleon became available for Q 2 = 0 [69][70][71]…”

Section: Introductionmentioning

confidence: 99%

Axial form factors of the octet baryons in a covariant quark model

Ramalho

Tsushima

2016

Phys. Rev. D

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We study the weak interaction axial form factors of the octet baryons, within the covariant spectator quark model, focusing on the dependence of four-momentum transfer squared, Q 2 . In our model the axial form factors GA(Q 2 ) (axial-vector form factor) and GP (Q 2 ) (induced pseudoscalar form factor), are calculated based on the constituent quark axial form factors and the octet baryon wave functions. The quark axial current is parametrized by the two constituent quark form factors, the axial-vector form factor g q A (Q 2 ), and the induced pseudoscalar form factor g q P (Q 2 ). The baryon wave functions are composed of a dominant S-state and a P -state mixture for the relative angular momentum of the quarks. First, we study in detail the nucleon case. We assume that the quark axial-vector form factor g q A (Q 2 ) has the same function form as that of the quark electromagnetic isovector form factor. The remaining parameters of the model, the P -state mixture and the Q 2 -dependence of g q P (Q 2 ), are determined by a fit to the nucleon axial form factor data obtained by lattice QCD simulations with large pion masses. In this lattice QCD regime the meson cloud effects are small, and the physics associated with the valence quarks can be better calibrated. Once the valence quark model is calibrated, we extend the model to the physical regime, and use the low Q 2 experimental data to estimate the meson cloud contributions for GA(Q 2 ) and GP (Q 2 ). Using the calibrated quark axial form factors, and the generalization of the nucleon wave function for the other octet baryon members, we make predictions for all the possible weak interaction axial form factors GA(Q 2 ) and GP (Q 2 ) of the octet baryons. The results are compared with the corresponding experimental data for GA(0), and with the estimates of baryon-meson models based on SU (6) symmetry.

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Axial form factor of the nucleon in the perturbative chiral quark model

Cited by 21 publications

References 42 publications

Study of baryon octet charge form factors in perturbative chiral quark model

Study of baryon octet charge form factors in perturbative chiral quark model

Meson cloud contributions to baryon axial form factors

Axial form factors of the octet baryons in a covariant quark model

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