scholarly journals Re-examining valence quark spin distributions

2017 ◽  
Vol 95 (11) ◽  
Author(s):  
A. I. Signal
Keyword(s):  
Valence Quark ◽  
Quark Spin ◽  
Spin Distributions

scholarly journals Quark Spin-Orbit Correlations

2015 ◽  
Vol 37 ◽  
pp. 1560036 ◽  
Author(s):  
Cédric Lorcé
Keyword(s):  
Angular Momentum ◽  
Phase Space ◽  
Orbital Angular Momentum ◽  
Valence Quark ◽  
Complete Characterization ◽  
Proton Spin ◽  
Spin Orbit ◽  
Parton Distributions ◽  
Transverse Momentum Dependent ◽  
Quark Spin

The proton spin puzzle issue focused the attention on the parton spin and orbital angular momentum contributions to the proton spin. However, a complete characterization of the proton spin structure requires also the knowledge of the parton spin-orbit correlation. We showed that this quantity can be expressed in terms of moments of measurable parton distributions. Using the available phenomenological information about the valence quarks, we concluded that this correlation is negative, meaning that the valence quark spin and kinetic orbital angular momentum are, in average, opposite. The quark spin-orbit correlation can also be expressed more intuitively in terms of relativistic phase-space distributions, which can be seen as the mother distributions of the standard generalized and transverse-momentum dependent parton distributions. We present here for the first time some examples of the general multipole decomposition of these phase-space distributions.

The valence and strange-sea quark spin distributions in the nucleon from semi-inclusive deep inelastic lepton scattering

1989 ◽  
Vol 230 (1-2) ◽  
pp. 141-148 ◽  
Author(s):  
Leonid L. Frankfurt ◽  
Mark I. Strikman ◽  
Lech Mankiewicz ◽  
Andreas Schäfer ◽  
Ewa Rondio ◽  
...  
Keyword(s):  
Quark Spin ◽  
Spin Distributions

scholarly journals The quark spin distributions of the nucleon

1998 ◽  
Vol 441 (1-4) ◽  
pp. 461-467 ◽  
Author(s):  
Bo-Qiang Ma ◽  
Ivan Schmidt ◽  
Jacques Soffer
Keyword(s):  
Quark Spin ◽  
Spin Distributions

scholarly journals Valence-quark distribution of the kaon and pion from lattice QCD

2021 ◽  
Vol 103 (1) ◽  
Author(s):  
Huey-Wen Lin ◽  
Jiunn-Wei Chen ◽  
Zhouyou Fan ◽  
Jian-Hui Zhang ◽  
Rui Zhang
Keyword(s):  
Lattice Qcd ◽  
Valence Quark ◽  
Quark Distribution
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