We report new measurements of the parity-violating asymmetry A(PV) in elastic scattering of 3 GeV electrons off hydrogen and 4He targets with approximately 6.0 degrees . The 4He result is A(PV)=(+6.40+/-0.23(stat)+/-0.12(syst))x10(-6). The hydrogen result is A(PV)=(-1.58+/-0.12(stat)+/-0.04(syst))x10(-6). These results significantly improve constraints on the electric and magnetic strange form factors G(E)(s) and G(M)(s). We extract G(E)(s)=0.002+/-0.014+/-0.007 at =0.077 GeV2, and G(E)(s)+0.09G(M)(s)=0.007+/-0.011+/-0.006 at =0.109 GeV2, providing new limits on the role of strange quarks in the nucleon charge and magnetization distributions.

Acha, A

Aniol, KA

Armstrong, DS

Arrington, J

Averett, T

Bailey, SL

Barber, J

Beck, A

Benaoum, H

Benesch, J

Bertin, PY

Bosted, P

Butaru, F

Burtin, E

Cates, GD

Chao, Y-C

Chen, J-P

Chudakov, E

Cisbani, E

Craver, B

Cusanno, F

De Leo, R

Decowski, P

Deur, A

Feuerbach, RJ

Finn, JM

Frullani, S

Fuchs, SA

Fuoti, K

Gilman, R

Glesener, LE

Grimm, K

Grames, JM

Hansen, JO

Hansknecht, J

Higinbotham, DW

Holmes, R

Holmstrom, T

Ibrahim, H

de Jager, CW

Jiang, X

Katich, J

Kaufman, LJ

Kelleher, A

King, PM

Kolarkar, A

Kowalski, S

Kuchina, E

Kumar, KS

Lagamba, L

LaViolette, P

LeRose, J

Lindgren, RA

Lhuillier, D

Liyanage, N

Margaziotis, DJ

Markowitz, P

Meekins, DG

Meziani, Z-E

Michaels, R

Moffit, B

Nanda, S

Nelyubin, V

Otis, K

Paschke, KD

Phillips, SK

Poelker, M

Pomatsalyuk, R

Potokar, M

Prok, Y

Puckett, A

Qian, X

Qiang, Y

Reitz, B

Roche, J

Saha, A

Sawatzky, B

Singh, J

Slifer, Karl

Sirca, S

Snyder, R

Solvignon, P

Souder, PA

Stutzman, ML

Subedi, R

Suleiman, R

Sulkosky, V

Tobias, WA

Ulmer, PE

Urciuoli, GM

Wang, K

Whitbeck, A

Wilson, R

Wojtsekhowski, B

Yao, H

Ye, Y

Zhan, X

Zheng, X

Zhou, S

Ziskin, V

HAPPEX Collaboration

published 

January 19, 2007

General Physics

Physical Review Letters  Journal