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.
复制标题
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
中科院分区:
文献类型:
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作者:
The E;K. A. E. al
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.