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We calculate the twist three distribution f_\perp(x,k^\perp) contributing toCahn effect in unpolarized semi-inclusive deep inelastic scattering. We uselight-front Hamiltonian technique and take the state to be a dressed quark atone loop in perturbation theory. The 'genuine twist three' contribution comesfrom the quark-gluon interaction part in the operator and is explicitlycalculated. f_\perp(x,k^\perp) is compared with f_1(x,k^\perp).

Twist Three Distribution f_\perp(x,k^\perp) in Light-front Hamiltonian Approach