Quark orbital angular momentum in the MIT bag model

Courtoy, Aurore; Miramontes, A. S.

doi:10.1103/physrevd.95.014027

Cited by 9 publications

(5 citation statements)

References 33 publications

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“…While a number of model calculations of GTMDs is available by now [3,4,8,9,[18][19][20][21][22][23][24][25][26][27][28][29], for many years it was unknown how GTMDs can be measured. Only recently it was shown that GTMDs of gluons can, in principle, be accessed via diffractive di-jet production in deep-inelastic lepton-nucleon and lepton-nucleus scattering [30][31][32], as well as virtual photon-nucleus quasi-elastic scattering [27].…”

Section: Introductionmentioning

confidence: 99%

Generalized TMDs and the exclusive double Drell–Yan process

2017

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Section: Introductionmentioning

confidence: 99%

Generalized TMDs and the exclusive double Drell–Yan process

2017

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“…The general physical meaning of L q is that it is the torque acting on a quark during the polarized DIS process [39,138]: Ji's L q is the OAM before the probing photon is absorbed by the quark, while the Jaffe-Manohar L q is the OAM after the photon absorption, with the absorbing quark kicked out to infinity. These two definitions of L q have been investigated with several models, e.g., [137,139], whose results are shown in Section 6.11.2.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…These two definitions of L q have been investigated with several models, e.g. [137,139], whose results are shown in section 6.11.2.…”

Section: Definitions Of the Spin Sum Rule Componentsmentioning

confidence: 99%

The spin structure of the nucleon

2019

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We review the present understanding of the spin structure of protons and neutrons, the fundamental building blocks of nuclei collectively known as nucleons. The field of nucleon spin provides a critical window for testing Quantum Chromodynamics (QCD), the gauge theory of the strong interactions, since it involves fundamental aspects of hadron structure which can be probed in detail in experiments, particularly deep inelastic lepton scattering on polarized targets.QCD was initially probed in high energy deep inelastic lepton scattering with unpolarized beams and targets. With time, interest shifted from testing perturbative QCD to illuminating the nucleon structure itself. In fact, the spin degrees of freedom of hadrons provide an essential and detailed verification of both perturbative and nonperturbative QCD dynamics.Nucleon spin was initially thought of coming mostly from the spin of its quark constituents, based on intuition from the parton model. However, the first experiments showed that this expectation was incorrect. It is now clear that nucleon physics is much more complex, involving quark orbital angular momenta as well as gluonic and sea quark contributions. Thus, the nucleon spin structure remains a most active aspect of QCD research, involving important advances such as the developments of generalized parton distributions (GPD) and transverse momentum distributions (TMD).Elastic and inelastic lepton-proton scattering, as well as photoabsorption experiments provide various ways to investigate non-perturbative QCD. Fundamental sum rules -such as the Bjorken sum rule for polarized photoabsorption on polarized nucleons -are also in the non-perturbative domain. This realization triggered a vigorous program to link the low energy effective hadronic description of the strong interactions to fundamental quarks and gluon degrees of freedom of QCD. This has also led to advances in lattice gauge theory simulations of QCD and to the development of holographic QCD ideas based on the AdS/CFT or gauge/gravity correspondence, a novel approach providing a well-founded semiclassical approximation to QCD. Any QCD-based model of the nucleon's spin and dynamics must also successfully account for the observed spectroscopy of hadrons. Analytic calculations of the hadron spectrum, a long sought goal of QCD research, has now being realized using light-front holography and superconformal quantum mechanics, a formalism consistent with the results from nucleon spin studies.We begin this review with a phenomenological description of nucleon structure in general and of its spin structure in particular, aimed to engage non-specialist readers. Next, we discuss the nucleon spin structure at high energy, including topics such as 2

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Section: Definitions Of the Spin Sum Rule Componentsmentioning

confidence: 99%

The Spin Structure of the Nucleon

Deur,

Brodsky,

de Teramond

2018

Preprint

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We review the present understanding of the spin structure of protons and neutrons, the fundamental building blocks of nuclei collectively known as nucleons. The field of nucleon spin provides a critical window for testing Quantum Chromodynamics (QCD), the gauge theory of the strong interactions, since it involves fundamental aspects of hadron structure which can be probed in detail in experiments, particularly deep inelastic lepton scattering on polarized targets.QCD was initially probed in high energy deep inelastic lepton scattering with unpolarized beams and targets. With time, interest shifted from testing perturbative QCD to illuminating the nucleon structure itself. In fact, the spin degrees of freedom of hadrons provide an essential and detailed verification of both perturbative and nonperturbative QCD dynamics.Nucleon spin was initially thought of coming mostly from the spin of its quark constituents, based on intuition from the parton model. However, the first experiments showed that this expectation was incorrect.It is now clear that nucleon physics is much more complex, involving quark orbital angular momenta as well as gluonic and sea quark contributions. Thus, the nucleon spin structure remains a most active aspect of QCD research, involving important advances such as the developments of generalized parton distributions (GPD) and transverse momentum distributions (TMD).Elastic and inelastic lepton-proton scattering, as well as photoabsorption experiments provide various ways to investigate non-perturbative QCD. Fundamental sum rules -such as the Bjorken sum rule for polarized photoabsorption on polarized nucleons -are also in the non-perturbative domain. This realization triggered a vigorous program to link the low energy effective hadronic description of the strong interactions to fundamental quarks and gluon degrees of freedom of QCD. This has also led to advances in lattice gauge theory simulations of QCD and to the development of holographic QCD ideas based on the AdS/CFT or gauge/gravity correspondence, a novel approach providing a well-founded semiclassical approximation to QCD. Any QCD-based model of the nucleon's spin and dynamics must also successfully account for the observed spectroscopy of hadrons. Analytic calculations of the hadron spectrum, a long sought goal of QCD research, have now being realized using light-front holography and superconformal quantum mechanics, a formalism consistent with the results from nucleon spin studies.We begin this review with a phenomenological description of nucleon structure in general and of its spin structure in particular, aimed to engage non-specialist readers. Next, we discuss the nucleon spin structure at high energy, including topics such as Dirac's front form and light-front quantization which provide a frame-independent, relativistic description of hadron structure and dynamics, the derivation of spin sum rules, and a direct connection to the QCD Lagrangian. We then discuss experimental and theoretical advances in the nonperturbative domain -in ...

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Quark orbital angular momentum in the MIT bag model

Cited by 9 publications

References 33 publications

Generalized TMDs and the exclusive double Drell–Yan process

Generalized TMDs and the exclusive double Drell–Yan process

The spin structure of the nucleon

The Spin Structure of the Nucleon

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