arXiv 1402.71692014-02nucl-thhep-phnucl-ex

电荷对称性破缺与宇称破坏的电子-质子散射

Charge Symmetry Breaking and Parity Violating Electron-Proton Scattering

Michael Wagman, Gerald A. Miller

备注：: 17 pages, 5 figures; typos corrected, all results unchanged
发表信息：: Phys. Rev. C 89, 065206 (2014)
DOI：: 10.1103/PhysRevC.89.065206

摘要：

电荷对称性破缺对质子中性弱形状因子的贡献必须被理解，以便将来对违反宇称的电子-质子散射的测量被明确地解释为质子奇异性的证据。我们计算这些电荷对称性破缺形状因子的贡献，使用手性微扰理论与共振饱和估计未知的低能常数。引入核物理约束，降低了前阶共振饱和度估计的不确定性。高阶贡献的研究通过唯象顶点形状因子。我们预测，电荷对称性破缺的形状因子的贡献是一个数量级大于预期从天真的维度分析，但仍然是一个数量级小于目前的实验质子奇异性的界限。这与先前使用共振饱和手性微扰理论的计算是一致的。

英文摘要：

Charge symmetry breaking contributions to the proton's neutral weak form factors must be understood in order for future measurements of parity violating electron-proton scattering to be definitively interpreted as evidence of proton strangeness. We calculate these charge symmetry breaking form factor contributions using chiral perturbation theory with resonance saturation estimates for unknown low-energy constants. The uncertainty of the leading-order resonance saturation estimates is reduced by incorporating nuclear physics constraints. Higher-order contributions are investigated through phenomenological vertex form factors. We predict that charge symmetry breaking form factor contributions are an order of magnitude larger than expected from naive dimensional analysis but are still an order of magnitude smaller than current experimental bounds on proton strangeness. This is consistent with previous calculations using chiral perturbation theory with resonance saturation.

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