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arXiv 0706.0128nucl-ex
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低动量转移质子弹性形状因子比

The Proton Elastic Form Factor Ratio at Low Momentum Transfer

G. Ron, J. Glister, B. Lee

摘要:

在0.2到0.5 GeV^2之间的四个动量转移Q^2下,已经对质子弹性形状因子比进行了高精度测量。新的数据,而与以前的结果一致,清楚地表明一个比小于统一和显着的差异,从最近的几个现象学拟合的中心值。通过将新的形状因子比数据与现有的截面测量结果相结合,我们发现,在这个Q^2范围内,偏离1的主要原因是GEp小于偶极子参数化。

英文摘要:

High precision measurements of the proton elastic form factor ratio have been made at four-momentum transfers, Q^2, between 0.2 and 0.5 GeV^2. The new data, while consistent with previous results, clearly show a ratio less than unity and significant differences from the central values of several recent phenomenological fits. By combining the new form-factor ratio data with an existing cross-section measurement, one finds that in this Q^2 range the deviation from unity is primarily due to GEp being smaller than the dipole parameterization.

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