The Spin Dependent Structure Functions of the Nucleon

Bissey, F.; Cao, Fu-Guang; Signal, A. I.

doi:10.1063/1.2750819

Cited by 2 publications

(3 citation statements)

References 46 publications

(100 reference statements)

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“…Similar expressions exist for higher spin components of the cloud [12,13]. The fluctuations are calculated using standard techniques in time-ordered perturbation theory in the infinite momentum frame [8,12,13]. We find that for longitudinal fluctuation functions ∆ f iL (y) the nucleon and ∆ contributions are of similar size, with the s = 3/2 state of the ∆ being important.…”

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confidence: 57%

“…where γ 2 = 4x 2 m 2 N /Q 2 and ∆ f iL,T (y) are the diferences between spin up and spin down fluctuation functions projected longitudinally along or transverse to the baryon 3momentum. Similar expressions exist for higher spin components of the cloud [12,13]. The fluctuations are calculated using standard techniques in time-ordered perturbation theory in the infinite momentum frame [8,12,13].…”

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confidence: 99%

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g1(x) and g2(x) in the Meson Cloud Model

Signal¹

2005

AIP Conference Proceedings

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Abstract. We calculate the spin dependent structure functions g 1 (x) and g 2 (x) of the proton and neutron. Our calculation uses the meson cloud model of nucleon structure and includes the effects of kinematic terms which mix transverse and longitudinal spin components. We find small corrections to the nucleon structure functions, however these are significant for the neutron.The spin dependent structure functions of the nucleon are the subject of much theoretical and experimental interest. As deep inelastic (and other) experiments become more precise it is hoped that it may be possible to make an unequivocal measurement of a higher twist component in the structure function g 2 of the nucleon. This would give new information on the gluon field inside the nucleon, and its relationship with the quark fields.In order to make such an unequivocal identification it is necessary to understand the relationship between the structure functions g 1 and g 2 . In particular there are leading twist contributions to g 2 which arise from scattering from the components of the meson cloud of the physical nucleon. These contributions are of the order of 10% of the structure function, and need to be taken into account when calculating the twist-2 part of g 2 .The Meson Cloud Model (MCM) arises from the crucial observation [1] that the contribution of scattering from the pion cloud of the nucleon scales in the Bjorken limit. This implies that the parton distributions of the nucleon are modified via a convolution between the parton distribution of the meson and the momentum distribution of the meson in the proton, viz.As well as pions, the MCM takes into account scattering from the other baryon plus meson components in the Fock expansion of the wavefunction i.e.The other ingredients of the model are the interaction Lagrangians L int describing the N → BM vertices and the form factors for these vertices. The small probability of finding

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confidence: 57%

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g1(x) and g2(x) in the Meson Cloud Model

Signal¹

2005

AIP Conference Proceedings

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“…In the stringy model we model the fat proton as three valence quarks connected by color flux tubes. This phenomenological model is inspired by results from quenched lattice QCD which show that at even relatively modest valence quark separations the gluon field in a nucleon localizes into flux tubes [18,19]. In 3-body problems it is often convenient to use Jacobi coordinates…”

Section: The Stringy Modelmentioning

confidence: 99%

Mapping the proton’s fluctuating size and shape

Coleman-Smith

Müller

2014

Phys. Rev. D

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We discuss a mechanism for the apparently universal scaling in the high-multiplicity tail of charged particle distributions for high energy nuclear collisions. We argue that this scaling behavior originates from rare fluctuations of the nucleon density. We discuss a pair of simple models of proton shape fluctuations. A "fat" proton with a size of 3 fm occurs with observable frequency. In light of this result, collective flow behavior in the ensuing nuclear interaction seems feasible. We discuss the influence of these models on the large x structure of the proton and the likely influences on the distribution of initial state spatial eccentricities n.

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The Spin Dependent Structure Functions of the Nucleon

Cited by 2 publications

References 46 publications

g1(x) and g2(x) in the Meson Cloud Model

g1(x) and g2(x) in the Meson Cloud Model

Mapping the proton’s fluctuating size and shape

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