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Physical Sciences and Mathematics

University of Massachusetts Amherst

Krishna Kumar

2007

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Precision Measurements Of The Nucleon Strange Form Factors At Q2∼0.1  Gev^2, A. Acha, K. A. Aniol, D. S. Armstrong, J. Arrington, T. Averett, S. L. Bailey, J. Barber, A. Beck, H. Benaoum, J. Benesch, P. Y. Bertin, P. Bosted, F. Butaru, E. Burtin, G. D. Cates, Y. C. Chao, J. P. Chen, E. Chudakov, E. Cisbani, B. Craver, F. Cusanno, R. De Leo, P. Decowski, A. Deur, R. J. Feuerbach, J. M. Finn, S. Frullani, S. A. Fuchs, K. Fuoti, R. Gilman, L. E. Glesener, K. Grimm, J. M. Grames, J. O. Hansen, J. Hansknecht, D. W. Higinbotham, R. Holmes, T. Holmstrom, H. Ibrahim, C. W. De Jager, X. Jiang, J. Katich, L. J. Kaufman, A. Kelleher, P. M. King, A. Kolarkar, S. Kowalksi, E. Kuchina, Krishna Kumar, L. Lagamba, P. Laviolette, J. Lerose, R. A. Lindgren, D. Lhuillier, N. Liyanage, D. J. Margaziotis, P. Markowitz, D. G. Meekins, Z. E. Meziani, R. Michaels, B. Mofit, S. Nanda, V. Nelyubin, K. Otis, K. D. Paschke, S. K. Phillips, M. Poelker, R. Pomatsalyuk, M. Potokar, Y. Prok, A. Puckett, X. Qian, Y. Qiang, B. Reitz, J. Roche, A. Saha, B. Sawatzky, J. Singh, K. Slifer, S. Sirca, R. Snyder, P. Solvingnon, P. A. Souder, M. L. Stutzman, R. Subedi, R. Suleiman, V. Sulkosky, W. A. Tobias, P. E. Ulmer, G. M. Urciuoli, K. Wang, A. Whitbeck, R. Wilson, B. Wojsekhowsi, H. Yao, Y. Ye, X. Zhan, X. Zheng, S. Zhou, V. Ziskin Jan 2007

Precision Measurements Of The Nucleon Strange Form Factors At Q2∼0.1  Gev^2, A. Acha, K. A. Aniol, D. S. Armstrong, J. Arrington, T. Averett, S. L. Bailey, J. Barber, A. Beck, H. Benaoum, J. Benesch, P. Y. Bertin, P. Bosted, F. Butaru, E. Burtin, G. D. Cates, Y. C. Chao, J. P. Chen, E. Chudakov, E. Cisbani, B. Craver, F. Cusanno, R. De Leo, P. Decowski, A. Deur, R. J. Feuerbach, J. M. Finn, S. Frullani, S. A. Fuchs, K. Fuoti, R. Gilman, L. E. Glesener, K. Grimm, J. M. Grames, J. O. Hansen, J. Hansknecht, D. W. Higinbotham, R. Holmes, T. Holmstrom, H. Ibrahim, C. W. De Jager, X. Jiang, J. Katich, L. J. Kaufman, A. Kelleher, P. M. King, A. Kolarkar, S. Kowalksi, E. Kuchina, Krishna Kumar, L. Lagamba, P. Laviolette, J. Lerose, R. A. Lindgren, D. Lhuillier, N. Liyanage, D. J. Margaziotis, P. Markowitz, D. G. Meekins, Z. E. Meziani, R. Michaels, B. Mofit, S. Nanda, V. Nelyubin, K. Otis, K. D. Paschke, S. K. Phillips, M. Poelker, R. Pomatsalyuk, M. Potokar, Y. Prok, A. Puckett, X. Qian, Y. Qiang, B. Reitz, J. Roche, A. Saha, B. Sawatzky, J. Singh, K. Slifer, S. Sirca, R. Snyder, P. Solvingnon, P. A. Souder, M. L. Stutzman, R. Subedi, R. Suleiman, V. Sulkosky, W. A. Tobias, P. E. Ulmer, G. M. Urciuoli, K. Wang, A. Whitbeck, R. Wilson, B. Wojsekhowsi, H. Yao, Y. Ye, X. Zhan, X. Zheng, S. Zhou, V. Ziskin

Krishna Kumar

We report new measurements of the parity-violating asymmetry APV in elastic scattering of 3 GeV electrons off hydrogen and He4 targets with ⟨θlab⟩≈6.0°. The He4 result is APV=(+6.40±0.23(stat)±0.12(syst))×10−6. The hydrogen result is APV=(−1.58±0.12(stat)±0.04(syst))×10−6. These results significantly improve constraints on the electric and magnetic strange form factors GsE and GsM. We extract GsE=0.002±0.014±0.007 at ⟨Q2⟩=0.077  GeV2, and GsE+0.09GsM=0.007±0.011±0.006 at ⟨Q2⟩=0.109  GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.