New precision limit on the strange vector form factors of the proton

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. DeconinckP. 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. Muñoz-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, X. Yan, H. Yao, L. Ye, B. Zhao, X. Zheng

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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=0.624GeV2 and beam energy E b=3.48GeV 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 GEs+0.517GMs=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.

Original languageEnglish (US)
Article number102001
JournalPhysical Review Letters
Volume108
Issue number10
DOIs
StatePublished - Mar 5 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Ahmed, Z., Allada, K., Aniol, K. A., Armstrong, D. S., Arrington, J., Baturin, P., Bellini, V., Benesch, J., Beminiwattha, R., Benmokhtar, F., Canan, M., Camsonne, A., Cates, G. D., Chen, J. P., Chudakov, E., Cisbani, E., Dalton, M. M., De Jager, C. W., De Leo, R., ... Zheng, X. (2012). New precision limit on the strange vector form factors of the proton. Physical Review Letters, 108(10), [102001]. https://doi.org/10.1103/PhysRevLett.108.102001