New Precision Limit on the Strange Vector Form Factors of the Proton
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.
Keywords
Cite
@article{arxiv.1107.0913,
title = {New Precision Limit on the Strange Vector Form Factors of the Proton},
author = {HAPPEX collaboration and Z. Ahmed and K. Allada and K. A. Aniol and D. S. Armstrong and J. Arrington and P. Baturin and V. Bellini and J. Benesch and R. Beminiwattha and F. Benmokhtar and M. Canan and A. Camsonne and G. D. Cates and J. -P. Chen and E. Chudakov and E. Cisbani and M. M. Dalton and C. W. de Jager and R. De Leo and W. Deconinck and P. Decowski and X. Deng and A. Deur and C. Dutta and G. B. Franklin and M. Friend and S. Frullani and F. Garibaldi and A. Giusa and A. Glamazdin and S. Golge and K. Grimm and O. Hansen and D. W. Higinbotham and R. Holmes and T. Holmstrom and J. Huang and M. Huang and C. E. Hyde and C. M. Jen and G. Jin and D. Jones and H. Kang and P. King and S. Kowalski and K. S. Kumar and J. H. Lee and J. J. LeRose and N. Liyanage and E. Long and D. McNulty and D. Margaziotis and F. Meddi and D. G. Meekins and L. Mercado and Z. -E. Meziani and R. Michaels and C. Munoz-Camacho and M. Mihovilovic and N. Muangma and K. E. Myers and S. Nanda and A. Narayan and V. Nelyubin and Nuruzzaman and Y. Oh and K. Pan and D. Parno and K. D. Paschke and S. K. Phillips and X. Qian and Y. Qiang and B. Quinn and A. Rakhman and P. E. Reimer and K. Rider and S. Riordan and J. Roche and J. Rubin and G. Russo and K. Saenboonruang and A. Saha and B. Sawatzky and R. Silwal and S. Sirca and P. A. Souder and M. Sperduto and R. Subedi and R. Suleiman and V. Sulkosky and C. M. Sutera and W. A. Tobias and G. M. Urciuoli and B. Waidyawansa and D. Wang and J. Wexler and R. Wilson and B. Wojtsekhowski and X. Zhan and X. Yan and H. Yao and L. Ye and B. Zhao and X. Zheng},
journal= {arXiv preprint arXiv:1107.0913},
year = {2015}
}
Comments
5 pages, 3 figures