Measurement of the 
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 Dependence of the Deuteron Spin Structure Function 
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 and its Moments at Low 
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Adhikari, K. P.; Deur, A.; Fassi, L. El; Kang, H.; Kuhn, S. E.; Ripani, M.; Slifer, K.; Zheng, X.; Adhikari, S.; Akbar, Z.; Amaryan, M. J.; Avakian, H.; Ball, J.; Balossino, I.; Barion, L.; Battaglieri, M.; Bedlinskiy, I.; Biselli, A. S.; Bosted, P.; Briscoe, W. J.; Brock, J.; Bültmann, S.; Burkert, Volker; Cao, F.; Carlin, C.; Carman, D. S.; Celentano, A.; Charles, G.; Chen, J.-P.; Chetry, T.; Choi, S.; Ciullo, G.; Clark, L.; Cole, P. L.; Contalbrigo, M.; Credé, V.; D’Angelo, A.; Dashyan, N.; Vita, R. De; Sanctis, E. De; Defurne, M.; Djalali, C.; Dodge, G. E.; Drozdov, V. A.; Dupré, R.; Egiyan, H.; Alaoui, A. El; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Filippi, A.; Ghandilyan, Y.; Gilfoyle, G. P.; Golovatch, E.; Gothe, R. W.; Griffioen, K. A.; Guidal, M.; Guler, N.; Guo, L.; Hafidi, K.; Hakobyan, H.; Hanretty, C.; Harrison, N.; Hattawy, M.; Heddle, D.; Hicks, K.; Holtrop, M.; Hyde, Charles; Ilieva, Y.; Ireland, D.; Isupov, E. L.; Jenkins, David; Jo, H. S.; Johnston, S.; Joo, K.; Joosten, S.; Kabir, M. L.; Keith, C.; Keller, D.; Khachatryan, G.; Khachatryan, M.; Khandaker, M.; Kim, W.; Klein, A.; Klein, F. J.; Konczykowski, P.; Kovacs, K.; Kubarovsky, V.; Lanza, L.; Lenisa, P.; Livingston, K.; Long, E.; MacGregor, I. J. D.; Markov, N.; Mayer, M.; McKinnon, B.; Meekins, D.; Meyer, C. A.; Mineeva, T.; Mirazita, M.; Mokeev, V.; Movsisyan, A.; Camacho, C. Muñoz; Nadel-Turoński, P.; Niculescu, G.; Niccolai, S.; Osipenko, M.; Ostrovidov, A. I.; Paolone, M.; Pappalardo, L. L.; Paremuzyan, R.; Park, K.; Pasyuk, E.; Payette, David; Phelps, W.; Phillips, S. K.; Pierce, J.; Pogorelko, O.; Poudel, J.; Price, J. W.; Prok, Y.; Protopopescu, D.; Raue, B. A.; Rizzo, A.; Rosner, G.; Rossi, P.; Sabatié, F.; Salgado, Carlos A.; Schumacher, R. A.; Sharabian, Y. G.; Shigeyuki, T.; Simonyan, A.; Skorodumina, Iu.; Smith, G. D.; Sparveris, N.; Sokhan, D.; Stepanyan, S.; Strakovsky, I. I.; Strauch, S.; Sulkosky, V.; Taiuti, M.; Tan, J. A.; Ungaro, M.; Voutier, E.; Wei, X.; Weinstein, L. B.; Zhang, J.; Zhao, Z. W.

doi:10.1103/physrevlett.120.062501

Cited by 30 publications

(36 citation statements)

References 55 publications

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“…Experiments at MAMI, ELSA and LEGS [241] have verified the validity of the proton GDH sum rule within an accuracy of about 10%. The low Q 2 JLab I n T T (Q 2 ) measurement extrapolated to Q 2 = 0 is compatible with the GDH expectation for the neutron within the 20% experimental uncertainty [242]. A recent phenomenological assessment of the sum rule also concludes its validity [243].…”

Section: Accepted Manuscriptsupporting

confidence: 69%

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: Accepted Manuscriptsupporting

confidence: 69%

The spin structure of the nucleon

2019

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“…A precise measurement of the deuteron spin structure function and its moments at low-Q 2 is reported by the CLAS Collaboration [26]. The generalized GDH sum, shown in Figure 5, is precisely determined down to a minimum Q 2 of 0.02 GeV 2 for the first time, about 2.5 times lower than previously published data.…”

Section: Pos(dis2018)234mentioning

confidence: 68%

“…Figure 5: The GDH sum (left) and the forward spin polarizability (right) of the deuteron measured by CLAS Collaboration [26].…”

Section: -5mentioning

confidence: 99%

New results on spin and 3D structure measurements

H¹,

Liu²,

Zhao³

2018

Proceedings of XXVI International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2018)

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The nucleon spin structure has puzzled the physics community for about 30 years since the original discovery made by the EMC collaboration in late 1980s that the quark spin only contributes a small fraction to the nucleon spin. With major efforts from both theoretical and experimental sides, the quark spin contribution is relatively well known and the gluon spin contribution is becoming known in recent years. To fully understand the nucleon spin structure, the study has gone beyond one dimensional to three dimensional (3D) to probe the confined motion and access the orbital angular momentum of the partons inside the nucleon. In this paper, we briefly review the experimental status and the progress during the last year on the study of nucleon spin and 3D structures.

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“…A prominent example is the longitudinal-transverse polarizability of the proton (upper panel of Figure 4 and left panel of Figure 5), where the δ-and -expansion BχPT calculations are different by about a factor of 2. This "δ LT puzzle" could soon receive an experimental resolution, when the long-promised data from Jefferson Lab "Spin Physics Program" [102,129,135] on the proton spin structure function g 2 will be published [119]. Besides the polarizabilities, the Gerasimov-Drell-Hearn sum rule for the neutron will be verified by the E97-110 experiment using a helium-3 target [136].…”

Section: Discussionmentioning

confidence: 99%