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26 April 2024

» arxiv » 0903.2733

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Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q2=0.22 (GeV/c)2
S. Baunack ; K. Aulenbacher ; D. Balaguer Ríos ; L. Capozza ; J. Diefenbach ; B. Gläser ; D. v. Harrach ; Y. Imai ; 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 ;
Date:	16 Mar 2009
Abstract:	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.
Source:	arXiv, 0903.2733
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