Bag model prediction for the nucleon ’ s chiral - odd twist - 3 distribution h L ( x , Q 2 ) at high Q 2
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چکیده
We study the Q evolution of the nucleon’s chiral-odd twist-3 distribution hL(x,Q ) starting from the MIT bag model calculation. A simple GLAP equation for hL(x,Q ) obtained at large Nc is used for the Q 2 evolution. The correction due to the finite value of Nc is O(1/N c ) ∼ 10 % level. It turns out that the twist-3 contribution to hL(x,Q) is significantly reduced at Q = 10 GeV in contrast to the g2(x,Q ) case. This is due to the fact that the corresponding anomalous dimension for hL is larger than that for g2 at small n (spin).
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تاریخ انتشار 1997