High energy neutrino in a nuclear environment: mirror asymmetry of the shadowing effect

Abstract

The parity non-conservation effect in diffractive charged current DIS is quantified in terms of color dipole sizes of left-handed and right-handed electroweak bosons. We identify the origin and estimate the strength of the left-right asymmetry effect and present comparison with experimental data on the parity-odd structure function $\Delta x{F}_3=x{F}_3^{\nu N}-x{F}_3^{\bar{\nu }N}$. We study the shadowing effect in absorption of left-handed and right-handed $W$-bosons by atomic nuclei. The target nucleus is found to be quite transparent for the charmed-strange Fock component of the light-cone $W^{+}$ in the helicity state $\lambda =+1$ and rather opaque for the $c\bar{s}$ dipole with $\lambda =-1$.

Comments: 11 pages, 2 figures, Talk presented at XXXIII International Conference on High Energy Physics 26.07.06-02.08.06 Moscow, version to be published