Precise Determination of the Deuteron Spin Structure at Low to Moderate $Q^2$ with CLAS and Extraction of the Neutron Contribution

Guler, N.; Fersch, R. G.; Kuhn, S. E.; Bosted, P.; Griffioen, K. A.; Keith, C.; Minehart, R.; Prok, Y.; Adhikari, K. P.; Adikaram, D.; Amaryan, M. J.; Anderson, M. D.; Pereira, S. Anefalos; Ball, J.; Battaglieri, M.; Batourine, V.; Bedlinskiy, I.; Briscoe, W. J.; Brooks, W. K.; Bultmann, S.; Burkert, V. D.; Carman, D. S.; Celentano, A.; Chandavar, S.; Charles, G.; Colaneri, L.; Cole, P. L.; Contalbrigo, M.; Crabb, D.; Crede, V.; Angelo, A. D; Dashyan, N.; Deur, A.; Djalali, C.; Dodge, G. E.; Dupre, R.; Alaoui, A. El; Fassi, L. El; Elouadrhiri, L.; Eugenio, P.; Fedotov, G.; Fegan, S.; Filippi, A.; Fleming, J. A.; Forest, T. A.; Garillon, B.; Garcon, M.; Gevorgyan, N.; Gilfoyle, G. P.; Giovanetti, K. L.; Girod, F. X.; Goetz, J. T.; Golovatch, E.; Gothe, R. W.; Guidal, M.; Guo, L.; Hafidi, K.; Hakobyan, H.; Harrison, N.; Hattawy, M.; Hicks, K.; Ho, D.; Holtrop, M.; Hughes, S. M.; Hyde, C. E.; Ireland, D. G.; Ishkhanov, B. S.; Isupov, E. L.; Jo, H. S.; Joo, K.; Joosten, S.; Keller, D.; Khandaker, M.; Kim, A.; Kim, W.; Klein, A.; Klein, F. J.; Kubarovsky, V.; Kuleshov, S. V.; Livingston, K.; Lu, H. Y.; MacGregor, I. J. D.; McKinnon, B.; Mirazita, M.; Mokeev, V.; Montgomery, R. A.; Movsisyan, A; Camacho, C. Munoz; Nadel-Turonski, P.; Net, L. A.; Niculescu, I.; Osipenko, M.; Ostrovidov, A. I.; Park, K.; Pasyuk, E.; Pisano, S.; Pogorelko, O.; Price, J. W.; Procureur, S.; Ripani, M.; Rizzo, A.; Rosner, G.; Rossi, P.; Roy, P.; Sabatie, F.; Salgado, C.; Schott, D.; Schumacher, R. A.; Seder, E.; Simonyan, A.; Skorodumina, Iu.; Sokhan, D.; Sparveris, N.; Strakovsky, I. I.; Strauch, S.; Sytnik, V.; Tian, Ye; Tkachenko, S.; Ungaro, M.; Voutier, E.; Walford, N. K.; Wei, X.; Weinstein, L. B.; Wood, M. H.; Zachariou, N.; Zana, L.; Zhang, J.; Zhao, Z. W.; Zonta, I.

doi:10.48550/arxiv.1505.07877

Cited by 2 publications

(10 citation statements)

References 40 publications

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“…One of the primary goals of the eg1b experiment was the measurement of spin structure functions through in-clusive electron scattering, with results reported in Refs. [18][19][20][21][22]. Many experimental details can be found in these publications.…”

Section: Methodsmentioning

confidence: 99%

“…Charged-particle tracks were associated with the corresponding CC signals, EC energy deposition, and timing from the SC using geometrical matching. Additional details can be found in the two archival papers describing the eg1b inclusive analysis [21,22].…”

Section: Analysis Data Processingmentioning

confidence: 99%

“…The product of beam polarization (P B ) and target polarization (P T ) was determined using the well-understood beam-target spin asymmetry in elastic ep scattering (quasi-elastic scattering for the deuteron target). The results [21,22] are listed in Table II. The beam polarization was measured using Møller scattering.…”

Section: Beam and Target Polarizationmentioning

confidence: 99%

“…Bound nucleons are defined to be in materials with atomic number A > 2. The latter was determined from a detailed analysis of the target composition using inclusive electron scattering rates from ammonia, carbon, and empty targets [21,22]. The ratio must be determined separately for bound protons in the NH 3 target (for the ep → eπ + n reaction) and for bound neutrons in the ND 3 target (for the ed → eπ − p(p) reaction).…”

Section: Dilution Factormentioning

confidence: 99%

“…The product of beam and target polarization was determined for the polarized proton target from ep elastic events with a relative statistical precision ranging from 1% at low beam energies to about 3% at 5.7 GeV [21,22]. A spread of about 1.5% was observed in comparing the results with different event selection criteria.…”

Section: Target and Beam Polarizationmentioning

confidence: 99%

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Target and Beam-Target Spin Asymmetries in Exclusive $π^+$ and $π^-$ Electroproduction with 1.6 to 5.7 GeV Electrons

Bosted,

Biselli,

Careccia

et al. 2016

Preprint

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Beam-target double spin asymmetries and target single-spin asymmetries in exclusive π + and quasi-exclusive π − electroproduction were obtained from scattering of 1.6 to 5.7 GeV longitudinally polarized electrons from longitudinally polarized protons (for π + ) and deuterons (for π − ) using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab. The kinematic range covered is 1.1 < W < 2.6 GeV and 0.05 < Q 2 < 5 GeV 2 , with good angular coverage in the forward hemisphere. The asymmetry results were divided into approximately 40,000 kinematic bins for π + from free protons and 15,000 bins for π − production from bound nucleons in the deuteron. The present results are found to be in reasonable agreement with fits to previous world data for W < 1.7 GeV and Q 2 < 0.5 GeV 2 , with discrepancies increasing at higher values of Q 2 , especially for W > 1.5 GeV. Very large target-spin asymmetries are observed for W > 1.6 GeV. When combined with cross section measurements, the present results can provide powerful constraints on nucleon resonance amplitudes at moderate and large values of Q 2 , for resonances with masses as high as 2.3 GeV.

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Section: Methodsmentioning

confidence: 99%

Section: Analysis Data Processingmentioning

confidence: 99%

Section: Beam and Target Polarizationmentioning

confidence: 99%

Section: Dilution Factormentioning

confidence: 99%

Section: Target and Beam Polarizationmentioning

confidence: 99%

See 3 more Smart Citations

Target and Beam-Target Spin Asymmetries in Exclusive $π^+$ and $π^-$ Electroproduction with 1.6 to 5.7 GeV Electrons

Bosted,

Biselli,

Careccia

et al. 2016

Preprint

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Detailed Study of Quark-Hadron Duality in Spin Structure Functions of the Proton and Neutron

Lagerquist¹,

Kuhn²,

Sato³

2022

Preprint

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Background: The response of hadrons, the bound states of the strong force (QCD), to external probes can be described in two different, complementary frameworks: As direct interactions with their fundamental constituents, quarks and gluons, or alternatively as elastic or inelastic coherent scattering that leaves the hadrons in their ground state or in one of their excited (resonance) states. The former picture emerges most clearly in hard processes with high momentum transfer, where the hadron response can be described by the perturbative expansion of QCD, while at lower energy and momentum transfers, the resonant excitations of the hadrons dominate the cross section. The overlap region between these two pictures, where both yield similar predictions, is referred to as quark-hadron duality and has been extensively studied in reactions involving unpolarized hadrons. Some limited information on this phenomenon also exists for polarized protons, deuterons and 3 He nuclei.Purpose: In this paper, we present for the first time comprehensive and detailed results on the correspondence between the extrapolated deep inelastic structure function g1 of both the proton and the neutron with the same quantity measured in the nucleon resonance region.Method: We use a QCD parameterization of the world data on DIS spin structure functions, extrapolated into the nucleon resonance region and averaged over various intervals in the scaling variable x. We compare the results with the large data set collected in the quark-hadron transition region by the CLAS collaboration, averaged over the same intervals. We present this comparison as a function of the momentum transfer Q 2 .Results: We find that, depending on the averaging interval and the minimum momentum transfer chosen, a clear transition to quark-hadron duality can be observed in both nucleon species. Furthermore, we show, for the first time, the scaling behavior of g1 measured in the resonance region at sufficiently high momentum transfer.Conclusions: Our results can be used to quantify the deviations from the applicability of pQCD for data taken at moderate energies, and help with extraction of quark distribution functions from such data.

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Precise Determination of the Deuteron Spin Structure at Low to Moderate $Q^2$ with CLAS and Extraction of the Neutron Contribution

Cited by 2 publications

References 40 publications

Target and Beam-Target Spin Asymmetries in Exclusive $π^+$ and $π^-$ Electroproduction with 1.6 to 5.7 GeV Electrons

Target and Beam-Target Spin Asymmetries in Exclusive $π^+$ and $π^-$ Electroproduction with 1.6 to 5.7 GeV Electrons

Detailed Study of Quark-Hadron Duality in Spin Structure Functions of the Proton and Neutron

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