Revealing Color Forces with Transverse Polarized Electron Scattering

Armstrong, W.; Kang, H.; Liyanage, A.; Maxwell, James; Mulholland, J.; Ndukum, L. Z.; Ahmidouch, A.; Albayrak, I.; Asaturyan, A.; Ates, O.; Baghdasaryan, H.; Boeglin, W.; Bosted, P.; Brash, E. J.; Butuceanu, C.; Bychkov, M.; Carter, P.; Chen, C.; Chen, J. P.; Choi, S.; Christy, M. E.; Covrig, S.; Crabb, D.; Danagoulian, S.; Daniel, A.; Davidenko, A. M.; Davis, Brian; Day, D.; Deconinck, W.; Deur, A.; Dunne, J.; Dutta, D.; Fassi, L. El; Ellis, C.; Ent, R.; Flay, D.; Frlež, E.; Gaskell, D.; Geagla, O.; German, J.; Gilman, R.; Gogami, T.; Gómez, J.; Goncharenko, Y.; Hashimoto, Osamu; Higinbotham, D. W.; Horn, T.; Huber, G. M.; Jones, M.; Kalantarians, N.; Kawama, D.; Keith, C.; Keppel, C.; Khandaker, M.; Kim, Y.; P, King; Köhl, M.; Kovacs, K.; Kubarovsky, V.; Li, Y.; Liyanage, N.; Luo, W.; Mack, D.; Mamyan, V.; Markowitz, P.; Maruta, T.; Meekins, D.; Mel'nik, Yu.M.; Meziani, Z. E.; Mkrtchyan, A.; Mkrtchyan, H.; Мочалов, В. В.; Monaghan, Peter; Narayan, A.; Nakamura, S. N.; Nuruzzaman, A.; Pentchev, L.; Počanić, D.; Posik, M.; Puckett, A. J. R.; Qiu, X.; Reinhold, J.; Riordan, S.; Roche, J.; Rondon, O.; Sawatzky, B.; Shabestari, M.; Slifer, K.; Smith, G. R.; Soloviev, L. F.; Solvignon, P.; Tadevosyan, V.; Tang, L.; Vasiliev, A. N.; Veilleux, M.; Walton, T.; Wesselmann, F. R.; Wood, S. A.; Huang, Yao; Ye, Z.; Zhang, J.; Zhu, Lingyan

doi:10.1103/physrevlett.122.022002

Cited by 22 publications

(18 citation statements)

References 43 publications

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“…The high-precision JLab experiments measured a clearly non-zero d 2 . More data for d p 2 are needed and will be provided shortly at low Q 2 [325] and in the DIS [288], see Table 1. Then, the 12 GeV upgrade of JLAB will provide d in the DIS with refined precision, in particular with the SoLID detector [364].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, E97-110 [286] and EG4 [242] investigated Γ 1 , Γ 2 , g 1 and g 2 in the Q 2 → 0 limit. EG1dvcs [287] extended EG1 to Q 2 = 5.8 GeV 2 with another large improvement in statistics, and the SANE experiment [288] focused on g 2 and the twist 3 moment d 2 up to Q 2 = 6.5 GeV 2 and 0.3 < x Bj < 0.85. Finally, E06-014 precisely measured d n 2 at Q 2 = 3.2 and 4.3 GeV 2 [289,290].…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Higher-twists and their x Bj -dependence have been extracted from spin structure data [269,282,283], in particular by global fit analyses [304,307,373]. More highertwists data are expected soon [288].…”

Section: 93mentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Accepted Manuscriptmentioning

confidence: 99%

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The spin structure of the nucleon

2019

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“…The twist-2 part is given in terms of g 1 . The quantity d 2 = 3 1 0 dx x 2 g 2 (x, Q 2 ) twist−3 has been extracted from several experiments (see [2] and references therein) and has been evaluated on the lattice. This Q 2 -dependent number is found to be small (roughly between ±0.01), which suggests the relative unimportance of the twist-3 quark-gluon correlation contributions in this case.…”

Section: D Spin Structurementioning

confidence: 99%

Overview of Spin Physics at EIC

Boer¹

2019

Proceedings of 23rd International Spin Physics Symposium — PoS(SPIN2018)

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“…The experimental measurement of g 2 (x, Q 2 ) is, however, very difficult. The existing data are scattered [20][21][22][23][24][25], and the twist-three part of g 2 (x, Q 2 ) can be extracted with large uncertainties only [26]. The first nontrivial moment of g 2 (x, Q 2 ) that is related to the matrix element of the local chiral-even twist-three operator of the lowest dimension, was estimated using QCD sum rules [27,28], models [29,30], and in lattice QCD [31].…”

Section: Introductionmentioning

confidence: 99%

QCD factorization for twist-three axial-vector parton quasidistributions

Braun

Vladimirov

2021

J. High Energ. Phys.

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The transverse component of the axial-vector correlation function of quark fields is a natural starting object for lattice calculations of twist-3 nucleon parton distribution functions. In this work we derive the corresponding factorization expression in terms of twist-2 and twist-3 collinear distributions to one-loop accuracy. The results are presented both in position space, as the factorization theorem for Ioffe-time distributions, and in momentum space, for the axial-vector quasi- and pseudodistributions.

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Revealing Color Forces with Transverse Polarized Electron Scattering

Cited by 22 publications

References 43 publications

The spin structure of the nucleon

The spin structure of the nucleon

Overview of Spin Physics at EIC

QCD factorization for twist-three axial-vector parton quasidistributions

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