Transverse strange quark spin structure of the nucleon

Abstract

We investigate the transverse quark spin densities of the nucleon with the lowest moment within the framework of the SU(3) chiral quark-soliton model, emphasizing the strange quark spin density. Based on previous results of the vector and tensor form factors, we are able to determine the impact-parameter dependent probability densities of transversely polarized quarks in an unpolarized nucleon as well as those of unpolarized quarks in a transversely polarized nucleon. We find that the present numerical results for the transverse spin densities of the up and down quarks are in good agreement with those of the lattice calculation. We predict the transvere spin densities of the strange quark. It turns out that the polarized strange quark is noticeably distorted in an unpolarized proton.Comment: 10 pages. 16 figures. Submitted to Physical Review

GPDs in the QCD Multi-Color Limit

“…Our study generalizes previous results on large-N c relations for chiral-even GPDs [1], quark transversity distributions [42,43,44], and matrix elements of local chiral-odd operators [25,26,27] and relies on the formal apparatus developed in these earlier works (see Sec.3 of Ref. [1]).…”

“…[21,22,23] and references therein. The form factors of local tensor operators, which constrain the lowest x-moment of the chiral-odd GPDs, have been calculated in lattice QCD [24] and in the chiral quark-soliton model [25,26,27]. The x-dependent chiral-odd GPDs have been studied in quark bound-state models of nucleon structure [28,29,30].…”

Chiral-odd generalized parton distributions for proton in a light-front quark-diquark model

“…In Fig. (5), we have compared our result for the tensor form factors with the corresponding results from lattice [22] and chiral quark soliton model [32,33]. The tensor form factors for u quark in this model agrees well with the chiral quark-soliton model (χQSM) but both(this model and χQSM model) deviate from lattice results for both u and d quarks.…”

Strong QCD from Hadron Structure Experiments

“…• Mass spectra of the SU(3) baryons [546,547] • Electromagnetic form factors of the baryon octet and decuplet [548][549][550][551] • Transition magnetic moments of the SU(3) baryons [552] • Axial-vector form factors of the baryon octet and decuplet [553,554] • Parity violation and Strange vector form factors of the nucleon [555][556][557] • Tensor charges and tensor form factors of the nucleon [558][559][560][561][562] • Gravitational form factors of the nucleon [563] • Semileptonic hyperon decays [564][565][566] • Unpolarized quark distributions (twist-2) of the nucleon [536,567] • Transversity distributions of the nucleon [568] • Antiquark distributions and unpolarized flavor asymmetry [569] • Quasi-parton distributions of the nucleon [570] • Electromagnetic form factors of singly heavy baryons [571,572] • Excited Ω c s as exotic baryons [573,574] • Generalized parton distributions [575] Possible extensions of the χQSM The present version of the χQSM is mainly applicable to the lowest-lying baryons. In order to explain the mass spectra and properties of both the excited light and heavy baryons, we have to extend the mean-field approximation.…”