Measurements of the proton and deuteron spin structure function g2 and asymmetry A2.

Measurements of the proton and deuteron spin structure function g2 and asymmetry A2.
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质子和氘核自旋结构函数 g2 和不对称性 A2 的测量。

DOI:
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发表时间:
1995
期刊:
影响因子:
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通讯作者:
K. A. E. al
K. A. E. al
中科院分区:
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文献类型:
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作者:
The E;K. A. E. al

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我们测量了质子和氘核虚拟光子核子不对称性 A{sup p}{sub 2} 和​​ A{sup d}{sub 2} 以及结构函数 g{sup p}{sub 2} 和​​ g{sup d}{sub 2} 在 0.03 < x < 0.8 和 1.3 < Q{sup 2} < 10 范围内 (GeV/c){sup 2} 通过非弹性散射极化电子离开极化氨目标。 A{sub 2} 的结果明显小于两个目标的阳性限度 (sqrt)R。在实验精度内,g{sub 2} 数据可以通过twist-2 贡献g{sup ww}{sub 2} 很好地描述。 Twist-3 矩阵元素已被提取并与理论预测进行比较。
We have measured proton and deuteron virtual photon-nucleon asymmetries A{sup p}{sub 2} and A{sup d}{sub 2} and structure functions g{sup p}{sub 2} and g{sup d}{sub 2} over the range 0.03 < x < 0.8 and 1.3 < Q{sup 2} < 10 (GeV/c){sup 2} by inelastically scattering polarized electrons off polarized ammonia targets. Results for A{sub 2} are significantly smaller than the positivity limit (sqrt)R for both targets. Within experimental precision the g{sub 2} data are well described by the twist-2 contribution, g{sup ww}{sub 2}. Twist-3 matrix elements have been extracted and are compared to theoretical predictions.