Chiral-odd twist-3 e(x) of the nucleon

We clarify the nonperturbative origin of the δ-function singularity at x=0 in the chiral-odd twist-3 distribution function e(x) of the nucleon. We also compare a theoretical prediction for e(x) based on the chiral quark soliton model with the empirical information extracted from the CLAS semi-inclusive DIS measurement.