The chirally-odd twist-3 distribution ea(x)
نویسندگان
چکیده
Properties of the nucleon twist-3 distribution function e(x) are reviewed. It is emphasized that the QCD equations of motion imply the existence of a δ-function at x = 0 in e(x), which gives rise to the pion-nucleon sigma-term. According to the resulting “practical” DIS sum rules the first and the second moment of e(x) vanish, a situation analogue to that of the pure twist-3 distribution function g 2 (x).
منابع مشابه
The chirally-odd twist-3 distribution function ea(x) in the chiral quark-soliton model
The chirally-odd twist-3 nucleon distribution e(x) is studied in the large-Nc limit in the framework of the chiral quark-soliton model at a low normalization point of about 0.6 GeV. The remarkable result is that in the model e(x) contains a δ-function-type singularity at x = 0. The regular part of e(x) is found to be sizeable at the low scale of the model and in qualitative agreement with bag m...
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تاریخ انتشار 2002