Higher twist effects in charmed-strange $\nu$DIS diffraction

TL;DR

This paper investigates how higher twist effects, due to non-conservation of charmed-strange currents, significantly influence the longitudinal structure function in neutrino deep inelastic scattering at small Bjorken x, with implications for understanding charm production.

Contribution

It provides a quantitative analysis of higher twist effects in $ u$DIS, highlighting the dominance of charmed-strange contributions to the longitudinal structure function at small x.

Findings

Charmed-strange current effects dominate $F_L$ at $x \\lsim 0.01$ and $Q^2 \\sim m_c^2$.

Higher twist corrections are enhanced at small x due to gluon density growth.

Color dipole analysis clarifies the physics and estimates the effect quantitatively.

Abstract

The non-conservation of charmed-strange current in the neutrino deep inelastic scattering ($\nu$DIS) strongly affects the longitudinal structure function, $F_L$, at small values of Bjorken $x$. The corresponding correction to $F_L$ is a higher twist effect enhanced at small-$x$ by the rapidly growing gluon density factor. As a result, the component of $F_L$ induced by the charmed-strange current prevails over the light-quark component and dominates $F_L=F_L^{cs}+F_L^{ud}$ at $x\lsim 0.01$ and $Q^2\sim m_c^2$. The color dipole analysis clarifies the physics behind the phenomenon and provides a quantitative estimate of the effect.