Higher twist effects in charmed-strange νDIS diffraction

The non-conservation of charmed-strange current in the neutrino deep inelastic scattering (νDIS) strongly affects the longitudinal structure function, FL, at small values of Bjorken x. The corresponding correction to FL is a higher twist effect enhanced at small x by the rapidly growing gluon density factor. As a result, the component of FL induced by the charmed-strange current prevails over the light-quark component and dominates FL=FLcs+FLud at x≲0.01 and Q2∼mc2. The color dipole analysis clarifies the physics behind the phenomenon and provides a quantitative estimate of the effect.