The Spin Structure of the Nucleon

Filippone, B. W.; Ji, Xiangdong

doi:10.1007/0-306-47915-x_1

Cited by 218 publications

(220 citation statements)

References 296 publications

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“…We use gauge field configurations with 2 þ 1 flavors of nonperturbatively OðaÞ-improved Wilson fermions and a lattice volume of L 3 × T ¼ 32 3 × 64. The lattice spacing a ¼ 0.074ð2Þ fm is set using a number of singlet quantities [29][30][31][32].…”

Section: Simulation Detailsmentioning

confidence: 99%

Disconnected contributions to the spin of the nucleon

Chambers

Horsley²,

Schiller

et al. 2015

Phys. Rev. D

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The spin decomposition of the proton is a long-standing topic of much interest in hadronic physics. Lattice QCD has had much success in calculating the connected contributions to the quark spin. However complete calculations, which necessarily involve gluonic and strange-quark contributions, still present some challenges. These "disconnected" contributions typically involve small signals hidden against large statistical backgrounds and rely on computationally intensive stochastic techniques. In this work we demonstrate how a Feynman-Hellmann approach may be used to calculate such quantities, by measuring shifts in the proton energy arising from modifications to the QCD action. We find a statistically significant nonzero result for the disconnected quark spin contribution to the proton of about −5% at a pion mass of 470 MeV.

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Section: Simulation Detailsmentioning

confidence: 99%

Disconnected contributions to the spin of the nucleon

Chambers

Horsley²,

Schiller

et al. 2015

Phys. Rev. D

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“…(14). In this case one gets, among the others, the Collins function, ∆ N D C/q ↑ , and a chiral-even TMD fragmentation function of an unpolarized quark into a transversely polarized hadron (denoted consistently as ∆ N D C ↑ /q ).…”

Section: Parton Model Approaches Including Intrinsic Transverse Motionmentioning

confidence: 99%

“…The rich, low-energy aspects of topics iii) and iv), which may be confronted only with nonperturbative approaches, will also remain uncovered. A comprehensive overview on these subjects and on related topics can be found in several review papers, addressing both their theoretical and experimental aspects [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]. Here we will focus on the high-energy regime and the treatment in the context of pQCD approaches of transverse SSA's and, marginally, of the transverse polarization of spin 1/2 particles in unpolarized processes.…”

Section: Introductionmentioning

confidence: 99%

Azimuthal and single spin asymmetries in hard scattering processes

D’Alesio

Murgia

2008

Progress in Particle and Nuclear Physics

181

100

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In this article we review the present understanding of azimuthal and single spin asymmetries for inclusive and semi-inclusive particle production in unpolarized and polarized hadronic collisions at high energy and moderately large transverse momentum. After summarizing the experimental information available, we discuss and compare the main theoretical approaches formulated in the framework of perturbative QCD. We then present in some detail a generalization of the parton model with inclusion of spin and intrinsic transverse momentum effects. In this context, we extensively discuss the phenomenology of azimuthal and single spin asymmetries for several processes in different kinematical configurations. A comparison with the predictions of other approaches, when available, is also given. We finally emphasize some relevant open points and challenges for future theoretical and experimental investigation.

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“…As a consequence, it has been observed that the total nucleon momentum and spin are not exhausted by the quark contribution alone, and a large debate has originated on the involved quark-gluon dynamics (for a recent review, see Ref. [2]). …”

Section: Introductionmentioning

confidence: 99%