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Maas FE, Aulenbacher K, Baunack S, et al. Evidence for strange-quark contributions to the nucleon's form factors at Q2=0.108 (GeV/c)2. Phys Rev Lett. 2005;94(15):152001doi: 10.1103/PhysRevLett.94.152001.
Maas, F. E., Aulenbacher, K., Baunack, S., Capozza, L., Diefenbach, J., Gläser, B., Hammel, T., von Harrach, D., Imai, Y., Kabuss, E. M., Kothe, R., Lee, J. H., Lorente, A., Schilling, E., Schwaab, D., Sikora, M., Stephan, G., Weber, G., Weinrich, C., Altarev, I., Arvieux, J., El-Yakoubi, M., Frascaria, R., Kunne, R., Morlet, M., Ong, S., van de Wiele, J., Kowalski, S., Plaster, B., Suleiman, R., & Taylor, S. (2005). Evidence for strange-quark contributions to the nucleon's form factors at Q2=0.108 (GeV/c)2. Physical review letters, 94(15), 152001. https://doi.org/10.1103/PhysRevLett.94.152001
Maas, F E, et al. "Evidence for strange-quark contributions to the nucleon's form factors at Q2=0.108 (GeV/c)2." Physical review letters vol. 94,15 (2005): 152001. doi: https://doi.org/10.1103/PhysRevLett.94.152001
Maas FE, Aulenbacher K, Baunack S, Capozza L, Diefenbach J, Gläser B, Hammel T, von Harrach D, Imai Y, Kabuss EM, Kothe R, Lee JH, Lorente A, Schilling E, Schwaab D, Sikora M, Stephan G, Weber G, Weinrich C, Altarev I, Arvieux J, El-Yakoubi M, Frascaria R, Kunne R, Morlet M, Ong S, van de Wiele J, Kowalski S, Plaster B, Suleiman R, Taylor S. Evidence for strange-quark contributions to the nucleon's form factors at Q2=0.108 (GeV/c)2. Phys Rev Lett. 2005 Apr 22;94(15):152001. doi: 10.1103/PhysRevLett.94.152001. Epub 2005 Apr 20. PMID: 15904134.
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Phys Rev Lett. 2005 Apr 22;94(15):152001. doi: 10.1103/PhysRevLett.94.152001. Epub 2005 Apr 20.

Evidence for strange-quark contributions to the nucleon's form factors at Q2=0.108 (GeV/c)2.

Physical review letters

F E Maas, K Aulenbacher, S Baunack, L Capozza, J Diefenbach, B Gläser, T Hammel, D von Harrach, Y Imai, E-M Kabuss, R Kothe, J H Lee, A Lorente, E Schilling, D Schwaab, M Sikora, G Stephan, G Weber, C Weinrich, I Altarev, J Arvieux, M El-Yakoubi, R Frascaria, R Kunne, M Morlet, S Ong, J van de Wiele, S Kowalski, B Plaster, R Suleiman, S Taylor

Affiliations

  1. Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, JJ Becherweg 45, D-55099 Mainz, Germany.

PMID: 15904134 DOI: 10.1103/PhysRevLett.94.152001

Abstract

We report on a measurement of the parity violating asymmetry in the elastic scattering of polarized electrons off unpolarized protons with the A4 apparatus at MAMI in Mainz at a four momentum transfer value of Q(2)=0.108 (GeV/c)(2) and at a forward electron scattering angle of 30 degrees p)=[-1.36+/-0.29(stat)+/-0.13(syst)]x10(-6). The expectation from the standard model assuming no strangeness contribution to the vector current is A(0)=(-2.06+/-0.14)x10(-6). We have improved the statistical accuracy by a factor of 3 as compared to our previous measurements at a higher Q2. We have extracted the strangeness contribution to the electromagnetic form factors from our data to be G(s)(E)+0.106G(s)(M)=0.071+/-0.036 at Q(2)=0.108 (GeV/c)(2). We again find the value for G(s)(E)+0.106G(s)(M) to be positive, this time at an improved significance level of two sigma.

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