Measurements of the proton and deuteron spin structure function g2 and asymmetry A2.
نویسندگان
چکیده
We have measured proton and deuteron virtual photon-nucleon asymmetries A p 2 and A d 2 and structure functions g p 2 and g d 2 over the range 0:03 < x < 0:8 and 1:3 < Q 2 < 10 (GeV/c) 2 by inelastically scattering polarized electrons oo polarized ammonia targets. Results for A 2 are signiicantly smaller than the positivity limit p R for both targets. Within experimental precision the g 2 data are well-described by the twist-2 contribution, g W W 2. Twist-3 matrix elements have been extracted and are compared to theoretical predictions.
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عنوان ژورنال:
- Physical review letters
دوره 76 4 شماره
صفحات -
تاریخ انتشار 1996