An investigation of the spin structure of the proton in deep inelastic scattering of polarised muons on polarised protons

Ashman, J. G.; Badełek, B.; Baum, G.; Beaufays, J.; Bee, C. P.; Benchouk, C.; Bird, I.; Brown, S.; Caputo, Miranda; Cheung, H. W. K.; Chima, J. S.; Ciborowski, J.; Clifft, R. W.; Coignet, G.; Combley, F.; Court, G.R.; D’Agostini, G.; Drees, J.; Düren, M.; Dyce, N.; Edwards, A.; Edwards, M.; Ernst, Thomas; Ferrero, M. I.; Francis, D.; Gabathuler, E.; Gamet, R.; Gibson, V.; Gillies, J. D.; Grafström, P.; Hamacher, K.; Harrach, D. von; Hayman, P.; Holt, J.R.; Hughes, V. W.; Jachołkowska, A.; Jones, T. W.; Kabuß, E.; Korzen, B.; Krüner, U.; Kullander, S.; Landgraf, U.; Lanske, D.; Lettenström, F.; Lindqvist, T.; Loken, J.; Matthews, M.; Mizuno, Y.; Mönig, K.; Montanet, F.; Nagy, E.; Nassalski, J.; Niinikoski, T.; Norton, P. R.; Oakham, F. G.; Oppenheim, R. F.; Osborne, A.M.; Papavassiliou, V.; Pavel, N.; Peroni, C.; Peschel, H.; Piegaia, R.; Pietrzyk, B.; Pietrzyk, U.; Povh, Bogdan; Renton, P.; Rieubland, J. M.; Rijllart, A.; Rith, Klaus; Rondio, E.; Ropelewski, L.; Salmon, D. P.; Sandacz, A.; Schröder, T.; Schüler, K. P.; Schultze, K.; Shibata, T. A.; Sloan, T.; Staiano, A.; Stier, H. E.; Stock, J.; Taylor, G. N.; Thompson, J.C.; Walcher, Th.; Töth, J.; Urbán, L.; Wallucks, W.; Wheeler, S.; Williams, D.; Williams, W. S. C.; Wimpenny, S.; Windmolders, R.; Womersley, W. J.; Ziemons, K.

doi:10.1016/0550-3213(89)90089-8

Cited by 1,025 publications

(150 citation statements)

References 60 publications

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“…Yet, there exist many unresolved questions for the structure of the nucleon. The EMC experiments [1] and subsequent experiments show that quark spin carries only ∼ 30% of the total spin of the nucleon. Consequently, one concludes that the remaining ∼ 70% should be carried by the quark orbital contribution and the glue.…”

Section: Introductionmentioning

confidence: 99%

Strangeness in the nucleon from lattice QCD

Doi¹,

Deka²,

Dong³

et al. 2009

Proceedings of the XXVI International Symposium on Lattice Field Theory — PoS(LATTICE 2008)

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χQCD collaborationWe study the strangeness contribution to nucleon matrix elements using N f = 2 + 1 dynamical clover fermion configurations generated by the CP-PACS/JLQCD collaboration. In order to evaluate the disconnected insertion (DI), we use the Z(4) stochastic method, along with unbiased subtraction from the hopping parameter expansion which reduces the off-diagonal noises in the stochastic method. Furthermore, we find that using many nucleon sources for each configuration is effective in improving the signal. Our results for the quark contribution to the first moment x q in the DI, and the strangeness magnetic moment show that the statistical errors are under control with these techniques. We also study the gluonic contribution to the nucleon using the overlap operator to construct the gauge field tensor, F µν . The application to the calculation of first moment, x G , gives a good signal in quenched lattice QCD.

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Section: Introductionmentioning

confidence: 99%

Strangeness in the nucleon from lattice QCD

Doi¹,

Deka²,

Dong³

et al. 2009

Proceedings of the XXVI International Symposium on Lattice Field Theory — PoS(LATTICE 2008)

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“…Before 1990, it was assumed that the angular momentum of the proton came from the spin of the three valence quarks and that the sea was totally symmetric. As discussed in Section 1.1, measurements of spin structure functions [13] indicated that relatively little angular momentum came from the valence quarks, and the search was on for the other contributions. Sea quarks were high on the list.…”

Section: Strange Form Factorsmentioning

confidence: 99%

“…The advent of the "spin crisis" in 1989 [12,13], in which data on the spin-structure functions of the proton indicated that the spin of the proton was not simply the sum of the spins of the valence quarks, raised the question of the role of strange quarks in the nucleon [14]. McKeown [15] explained that PVES was a practical way to measure the strangeness content of nucleon elastic form factors.…”

Section: History Of the Fieldmentioning

confidence: 99%

Parity violation in electron scattering

Souder

Paschke

2015

Front. Phys.

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By comparing the cross sections for left-and right-handed electrons scattered from various unpolarized nuclear targets, the small parity-violating asymmetry can be measured. These asymmetry data probe a wide variety of important topics, including searches for new fundamental interactions and important features of nuclear structure that cannot be studied with other probes. A special feature of these experiments is that the results are interpreted with remarkably few theoretical uncertainties, which justifies pushing the experiments to the highest possible precision. To measure the small asymmetries accurately, a number of novel experimental techniques have been developed.

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“…While the SLAC measurements were in line with expectations from the QPM, the EMC results showed in the previously unmeasured small-x region (x < 0.1) a clear disagreement with potentially dramatic consequences. 33,34 In the QPM, the nucleon spin is supposed to arise entirely from the quark spins, while in relativistic quark models a contribution of about 60% is expected. However, the EMC result was compatible with zero.…”

Section: Nucleon Spin and Polarised Deep Inelastic Scatteringmentioning

confidence: 99%

Deep Inelastic Scattering with the SPS Muon Beam

Mallot

Voss

2015

Advanced Series on Directions in High Energy Physics

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We review results from deep inelastic muon scattering experiments at the SPS which started in 1978, and are still actively pursued today. Key results include the precision measurement of scaling violations and of the strong coupling constant, spin-dependent structure functions, and studies of the internal spin structure of protons and neutrons. These experiments have revealed a wealth of details about the internal structure of nucleons in terms of quarks and gluons.

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An investigation of the spin structure of the proton in deep inelastic scattering of polarised muons on polarised protons

Cited by 1,025 publications

References 60 publications

Strangeness in the nucleon from lattice QCD

Strangeness in the nucleon from lattice QCD

Parity violation in electron scattering

Deep Inelastic Scattering with the SPS Muon Beam

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