Measurement of Strange Quark Contributions to the Nucleon's Form Factors at Q^2=0.230 (GeV/c)^2

A4 Collaboration: F. E. Maas (1); A. Lopes Ginja (1); A. Lorente (1); B. Collin (3); B. Plaster (4); C. Weinrich (1); D. Marchand (3); D. von Harrach (1); E.-M. Kabuss (1); E. Schilling (1)

Measurement of Strange Quark Contributions to the Nucleon's Form Factors at Q²=0.230 (GeV/c)²

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arxiv nucl-ex/0401019 v1 pith:GZQZLZWA submitted 2004-01-16 nucl-ex

Measurement of Strange Quark Contributions to the Nucleon's Form Factors at Q²=0.230 (GeV/c)²

A4 Collaboration: F. E. Maas (1) , P. Achenbach (1) , K. Aulenbacher (1) , S. Baunack (1) , L. Capozza (1) , J. Diefenbach (1) , K. Grimm (1) , Y. Imai (1)

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T. Hammel (1) D. von Harrach (1) E.-M. Kabuss (1) R. Kothe (1) J. H. Lee (1) A. Lorente (1) A. Lopes Ginja (1) L. Nungesser (1) E. Schilling (1) G. Stephan (1) C. Weinrich (1) I. Altarev (2) J. Arvieux (3) B. Collin (3) R. Frascaria (3) M. Guidal (3) R. Kunne (3) D. Marchand (3) M. Morlet (3) S. Ong (3) J. van de Wiele (3) S. Kowalski (4) B. Plaster (4) R. Suleiman (4) S. Taylor (4)

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We report on a measurement of the parity-violating asymmetry in the scattering of longitudinally polarized electrons on unpolarized protons at a $Q^2$ of 0.230 (GeV/c)^2 and a scattering angle of \theta_e = 30^o - 40^o. Using a large acceptance fast PbF_2 calorimeter with a solid angle of \Delta\Omega = 0.62 sr the A4 experiment is the first parity violation experiment to count individual scattering events. The measured asymmetry is A_{phys} =(-5.44 +- 0.54_{stat} +- 0.27_{\rm sys}) 10^{-6}. The Standard Model expectation assuming no strangeness contributions to the vector form factors is $A_0=(-6.30 +- 0.43) 10^{-6}$. The difference is a direct measurement of the strangeness contribution to the vector form factors of the proton. The extracted value is G^s_E + 0.225 G^s_M = 0.039 +- 0.034 or F^s_1 + 0.130 F^s_2 = 0.032 +- 0.028.

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