Proton spin in a light-cone chiral quark model

2012 ◽  
Vol 85 (11) ◽  
Author(s):  
Xinyu Zhang ◽  
Bo-Qiang Ma
Keyword(s):  
Quark Model ◽  
Light Cone ◽  
Proton Spin ◽  
Chiral Quark Model

scholarly journals Ds Asymmetry in Photoproduction

2006 ◽  
Vol 21 (04) ◽  
pp. 893-896
Author(s):  
Gang Hao ◽  
Lin Li ◽  
Cong-Feng Qiao
Keyword(s):  
Heavy Quark ◽  
Quark Model ◽  
Light Cone ◽  
Chiral Quark Model ◽  
Experimental Measurements ◽  
Recombination Mechanism ◽  
Strong Restriction ◽  
Fluctuation Model

By adopting two models of strange and antistrange quark distributions inside nucleon, the light-cone meson-baryon fluctuation model and the effective chiral quark model, we calculate the [Formula: see text] asymmetry in photoproduction in the framework of heavy-quark recombination mechanism. We find that the effect of asymmetry of strange sea to the Ds asymmetry is considerable and depending on the different models. Therefore, we expect that with the further study in electroproduction, e.g. at HERA and CEBAF, the experimental measurements on the [Formula: see text] asymmetry may impose a strong restriction on the strange-antistrange distribution asymmetry models.

scholarly journals NuTeV ANOMALY VERSUS STRANGE-ANTISTRANGE ASYMMETRY

2006 ◽  
Vol 21 (04) ◽  
pp. 930-933 ◽  
Author(s):  
BO-QIANG MA
Keyword(s):  
Quark Model ◽  
Light Cone ◽  
Significant Part ◽  
Chiral Quark Model ◽  
Quark Contribution ◽  
Fluctuation Model

We report the correction from the asymmetric strange-antistrange sea of the nucleon by using both the light-cone baryon-meson fluctuation model and the chiral quark model, and show that a significant part of the NuTeV anomaly can be explained by the strange-antistrange asymmetry. We also show that the calculated [Formula: see text] asymmetry are compatible with the NuTeV data by including some additional symmetric [Formula: see text] quark contribution.

scholarly journals sQq¯q¯ ( q=u , d ; Q=c , b ) tetraquarks in the chiral quark model

2021 ◽  
Vol 103 (7) ◽  
Author(s):  
Gang Yang ◽  
Jialun Ping ◽  
Jorge Segovia
Keyword(s):  
Quark Model ◽  
Chiral Quark Model

scholarly journals The Genuine Resonance of Full-Charm Tetraquarks

Universe ◽  
2021 ◽  
Vol 7 (5) ◽  
pp. 155
Author(s):  
Xiaoyun Chen
Keyword(s):  
Quark Model ◽  
Bound States ◽  
Expansion Method ◽  
Chiral Quark Model ◽  
Stabilization Method ◽  
Scaling Method ◽  
Resonance States ◽  
Gaussian Expansion Method ◽  
Color Structure ◽  
Quantum Numbers

In this work, the genuine resonance states of full-charm tetraquark systems with quantum numbers JPC=0++,1+−,2++ are searched in a nonrelativistic chiral quark model with the help of the Gaussian Expansion Method. In this calculation, two structures, meson-meson and diquark–antidiquark, as well as their mixing with all possible color-spin configurations, are considered. The results show that no bound states can be formed. However, resonances are possible because of the color structure. The genuine resonances are identified by the stabilization method (real scaling method). Several resonances for the full-charm system are proposed, and some of them are reasonable candidates for the full-charm states recently reported by LHCb.

scholarly journals Structure of pentaquarks Pc+ in the chiral quark model

2017 ◽  
Vol 95 (1) ◽  
Author(s):  
Gang Yang ◽  
Jialun Ping ◽  
Fan Wang
Keyword(s):  
Quark Model ◽  
Chiral Quark Model

scholarly journals Studying ε′/ε in the chiral quark model: γ5-scheme independence and NLO hadronic matrix elements

1995 ◽  
Vol 449 (1-2) ◽  
pp. 197-225 ◽  
Author(s):  
Stefano Bertolini ◽  
Jan O. Eeg ◽  
Marco Fabbrichesi
Keyword(s):  
Quark Model ◽  
Chiral Quark Model ◽  
Matrix Elements
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