Simplification of Higher-Twist Evolution in the Large Nc Limit: Why and Why Not
نویسندگان
چکیده
Working in the light-cone gauge, we find a simple procedure to calculate the autonomous one-loop Q2 evolution of the twist-three part of the nucleon gT (x,Q2) structure function in the large-Nc limit. Our approach allows us to investigate the possibility of a similar large-Nc simplification for other higher-twist evolutions. In particular, we show that it does not occur for the twist-four part of the f4(x,Q), g3(x,Q) and h3(x,Q) distributions. We also argue that the simplification of the twist-three evolution does not persist beyond one loop. Typeset using REVTEX
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ar X iv : h ep - p h / 99 02 39 3 v 1 1 8 Fe b 19 99 Simplification of Higher - Twist Evolution in the Large N c Limit : Why and Why Not
Working in the light-cone gauge, we find a simple procedure to calculate the autonomous one-loop Q2 evolution of the twist-three part of the nucleon gT (x,Q 2) structure function in the large-Nc limit. Our approach allows us to investigate the possibility of a similar large-Nc simplification for other higher-twist evolutions. In particular, we show that it does not occur for the twist-four part...
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تاریخ انتشار 1999