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Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q2=0.22 (GeV/c)2

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 Q2=0.22 (GeV/c)2 is reported here. The measured asymmetry is ALR=(-17.23±0.82stat±0.89syst)×10-6. The standard model prediction assuming no strangeness is A0=(-15.87±1.22)×10-6. In combination with previous results from measurements at forward angles, it is possible to disentangle for the first time the strange form factors at this momentum transfer, GEs=0.050±0.038±0.019 and GMs=-0.14±0.11±0.11.
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http://hal.in2p3.fr/in2p3-00424323
Contributor : Sophie Heurteau <>
Submitted on : Thursday, October 15, 2009 - 2:14:49 PM
Last modification on : Wednesday, September 16, 2020 - 4:07:54 PM

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S. Baunack, K. Aulenbacher, D. Balaguer Ríos, L. Capozza, J. Diefenbach, et al.. Measurement of Strange Quark Contributions to the Vector Form Factors of the Proton at Q2=0.22 (GeV/c)2. Physical Review Letters, American Physical Society, 2009, 102, pp.151803. ⟨10.1103/PhysRevLett.102.151803⟩. ⟨in2p3-00424323⟩

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