Orbital angular momentum of the proton and intrinsic five-quark Fock states

An, Chun-Sheng; Saghai, B.

doi:10.1103/physrevd.99.094039

Cited by 8 publications

(4 citation statements)

References 59 publications

(108 reference statements)

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“…Recently, the extended chiral constituent quark model (EχCQM), within which higher Fock components in the baryons are included, has been applied to the sea content of the octet baryons [50], the sea flavor asymmetry of the proton d − ū = 0.118 ± 0.012 [51,52] could be very well reproduced by taking the model parameters to be the empirical values. Later, we have applied the work [50] to the baryon sigma terms [53,54], the intrinsic light and strange quark-antiquark pair in the proton and nonperturbative strangeness suppression [55], and the orbital angular momentum of the proton [56]. And in a very recent work, the axial charges of the proton has been investigated employing the EχCQM [57].…”

Section: Introductionmentioning

confidence: 99%

Investigations on the flavor-dependent axial charges of the octet baryons

Qi,

Wang,

et al. 2022

Preprint

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We have investigated the axial charges of the ground octet baryons within the extended chiral constituent quark model, where all the possible compact five-quark Fock components qqq(q q)(q = u, d, s) in the baryons are considered. The transition couplings between the three-and five-quark components in the baryons are assumed to be via the 3 P0 mechanism, which could reproduce the sea asymmetry in proton very well. The numerical results for the flavor-dependent axial charges of the octet baryons are comparable to those predicted by other theoretical approaches. It is shown that the singlet axial charges of the octet baryons, which should indicate total baryons spin arising from the spin of the quarks, fall in the range 0.45 − 0.75 in present model. This is in consistent with the predictions by lattice QCD and chiral perturbation theory. It's also very interesting that the light quarks spin ∆u and ∆d in the Λ baryon are of small but negative values, which exactly vanish in the traditional three-quark model.

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Section: Introductionmentioning

confidence: 99%

Investigations on the flavor-dependent axial charges of the octet baryons

Qi,

Wang,

et al. 2022

Preprint

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“…In present phenomenological work, to form the positive parity of proton, one of the quarks or antiquark in a given five-quark Fock component of the proton wave function must be in the orbital P -state, which contribute a value ∼ 0.158 to the spin of proton [39]. Consequently, the obtained wave function for proton in present work is then applied to study the inner quark spin of proton.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, the model of Ref. [38] was phenomenologically applied to study the quark orbital angular momentum in proton [39], where the theoretical calculations showed that L q = 0.158 ± 0.014. It was shown that the study of the intrinsic sea quark content of proton is of great interest to explore its properties.…”

Section: Introductionmentioning

confidence: 99%

The axial charges of proton within an extended chiral constituent quark model

Wang,

Li,

et al. 2021

Preprint

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We have performed a study of the isovector, octet and singlet axial charges of the proton in an extended chiral constituent quark model, where all the possible uudq q (q = u, d, s) five-quark Fock components in the proton wave function are taken into account. The 3 P0 quark-antiquark creation mechanism is assumed to account for the transition coupling between three-and five-quark components in proton, and the corresponding transition coupling strength is fixed by fitting the intrinsic sea flavor asymmetry d − ū data for proton. Accordingly, with all the parameters fixed by empirical values, the probabilities of the intrinsic five-quark Fock components in proton wave function should be ∼ 30 − 50%, which lead to the numerical results for quark spin ∆u, ∆d and ∆s, as well the axial charges of proton consistent with the experimental data and predictions by other theoretical approaches.

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“…The understanding of proton spin and 3D structure in conventional quark model tends to be insufficient with desired accuracy [86,87]. Though quark OAM are in connection with some of the TMD, e.g.…”

Section: Discussionmentioning

confidence: 99%

Accessing CFFs at the Electron Ion Collider in China: An Impact study on $\textbf{Im} {\mathcal E}$

Xu¹,

Zhang²

2023

Preprint

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We estimate the impact of asymmetry measurements of Deeply Virtual Compton Scattering (DVCS) with transversely polarized proton beam taken at a future Electron Ion Collider in China (EicC) on the extraction of Compton Form Factors (CFFs). The CFFs extracted from an analysis based on artificial neural-network approach are reweighted by means of pseudo-data generated in the expected kinematic region of EicC. We find a remarkable improvement in the extraction of CFF ImE, especially at the range of parton momentum fraction x ∼ 0.01, thus hinting for a future experimental probe of the parton orbital angular momentum. This work casts a glance at a practical implementation of Bayesian reweighting method on CFFs' impact study.

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Orbital angular momentum of the proton and intrinsic five-quark Fock states

Cited by 8 publications

References 59 publications

Investigations on the flavor-dependent axial charges of the octet baryons

Investigations on the flavor-dependent axial charges of the octet baryons

The axial charges of proton within an extended chiral constituent quark model

Accessing CFFs at the Electron Ion Collider in China: An Impact study on $\textbf{Im} {\mathcal E}$

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