后向角G0电子散射实验中奇异夸克对宇称破坏不对称性的贡献
Strange Quark Contributions to Parity-Violating Asymmetries in the Backward Angle G0 Electron Scattering Experiment
摘要：
我们测量了Q^2 = 0.22和0.63 GeV^2时弹性电子-质子和准弹性电子-氘核散射中的宇称破缺不对称性。它们对奇异夸克对核子流的贡献和核子轴向流都很敏感。结果表明，在这四个动量转移中，奇夸克的贡献小于10%，磁核子形状因子也小于10%。我们还提出了第一次测量的轴向电流在这些四个动量转移的Anapole力矩的影响。
英文摘要：
We have measured parity-violating asymmetries in elastic electron-proton and quasi-elastic electron-deuteron scattering at Q^2 = 0.22 and 0.63 GeV^2. They are sensitive to strange quark contributions to currents in the nucleon, and to the nucleon axial current. The results indicate strange quark contributions of < 10% of the charge and magnetic nucleon form factors at these four-momentum transfers. We also present the first measurement of anapole moment effects in the axial current at these four-momentum transfers.
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