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Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q**2=0.22 (GeV/c)**2

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arxiv 0903.2733 v1 pith:SRIHSERE submitted 2009-03-16 nucl-ex

S. Baunack , K. Aulenbacher , D. Balaguer Ríos , L. Capozza , J. Diefenbach , B. Gläser , D. v. Harrach , Y. Imai
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E. M. Kabuss R. Kothe J. H. Lee H. Merkel M. C. Mora Espí U. Müller E. Schilling G. Stephan C. Weinrich J. Arvieux M. A. El-Yakoubi R. Kunne F. E. Maas M. Morlet S. Ong J. van de Wiele S. Kowalski Y. Prok S. Taylor
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A new measurement of the parity violating asymmetry in elastic electron scattering on hydrogen at backward angles and at a four momentum transfer of Q^2=0.22 (GeV/c)^2 is reported here. The measured asymmetry is A_LR=(-17.23 +- 0.82_stat +-0.89_syst) ppm. The Standard Model prediction assuming no strangeness is A_0=(-15.87 +- 1.22) ppm. In combination with previous results from measurements at forward angles, it it possible to disentangle for the first time the strange electric and magnetic form factors at this momentum transfer, G_E^s(0.22)=0.050 +- 0.038 +- 0.019 and G_M^s(0.22)=-0.14 +- 0.11 +- 0.11.

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