ar X iv : h ep - p h / 01 02 29 6 v 1 2 3 Fe b 20 01 Twist - 3 in Proton Nucleon Single Spin Asymmetries
نویسنده
چکیده
The generation of the single spin asymmetries by the twist 3 effects in QCD is discussed. While the short-distance subprocesses is calculable in the Born approximation, some properties of large distance partonic correlations may be extracted by means of sum rules relating them to the DIS spin structure function g 2. The simple model for twist 3 part of the latter is proposed. The numerical analysis seems to favor the hypothesis about small value of the gluonic poles contribution to the single asymmetries, while the fermionic poles may lead to the measurable effects.
منابع مشابه
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تاریخ انتشار 2001