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Nuclear Experiment

arXiv:1107.0913 (nucl-ex)
[Submitted on 5 Jul 2011]

Title:New Precision Limit on the Strange Vector Form Factors of the Proton

Authors:HAPPEX collaboration: Z. Ahmed, K. Allada, K. A. Aniol, D. S. Armstrong, J. Arrington, P. Baturin, V. Bellini, J. Benesch, R. Beminiwattha, F. Benmokhtar, M. Canan, A. Camsonne, G. D. Cates, J.-P. Chen, E. Chudakov, E. Cisbani, M. M. Dalton, C. W. de Jager, R. De Leo, W. Deconinck, P. Decowski, X. Deng, A. Deur, C. Dutta, G. B. Franklin, M. Friend, S. Frullani, F. Garibaldi, A. Giusa, A. Glamazdin, S. Golge, K. Grimm, O. Hansen, D. W. Higinbotham, R. Holmes, T. Holmstrom, J. Huang, M. Huang, C. E. Hyde, C. M. Jen, G. Jin, D. Jones, H. Kang, P. King, S. Kowalski, K. S. Kumar, J. H. Lee, J. J. LeRose, N. Liyanage, E. Long, D. McNulty, D. Margaziotis, F. Meddi, D. G. Meekins, L. Mercado, Z.-E. Meziani, R. Michaels, C. Munoz-Camacho, M. Mihovilovic, N. Muangma, K. E. Myers, S. Nanda, A. Narayan, V. Nelyubin, Nuruzzaman, Y. Oh, K. Pan, D. Parno, K. D. Paschke, S. K. Phillips, X. Qian, Y. Qiang, B. Quinn, A. Rakhman, P. E. Reimer, K. Rider, S. Riordan, J. Roche, J. Rubin, G. Russo, K. Saenboonruang, A. Saha, B. Sawatzky, R. Silwal, S. Sirca, P. A. Souder, M. Sperduto, R. Subedi, R. Suleiman, V. Sulkosky, C. M. Sutera, W. A. Tobias, G. M. Urciuoli, B. Waidyawansa, D. Wang, J. Wexler, R. Wilson, B. Wojtsekhowski, X. Zhan et al. (5 additional authors not shown)
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Abstract:The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624 GeV and beam energy E =3.48 GeV to be A_PV = -23.80 +/- 0.78 (stat) +/- 0.36 (syst) parts per million. This result is consistent with zero contribution of strange quarks to the combination of electric and magnetic form factors G_E^s + 0.517 G_M^s = 0.003 +/- 0.010 (stat) +/- 0.004 (syst) +/- 0.009 (ff), where the third error is due to the limits of precision on the electromagnetic form factors and radiative corrections. With this measurement, the world data on strange contributions to nucleon form factors are seen to be consistent with zero and not more than a few percent of the proton form factors.
Comments: 5 pages, 3 figures
Subjects: Nuclear Experiment (nucl-ex)
Cite as: arXiv:1107.0913 [nucl-ex]
  (or arXiv:1107.0913v1 [nucl-ex] for this version)
  https://doi.org/10.48550/arXiv.1107.0913
Related DOI: https://doi.org/10.1103/PhysRevLett.108.102001

Submission history

From: Kent Paschke [view email]
[v1] Tue, 5 Jul 2011 16:08:33 UTC (58 KB)
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