Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-12-24
Phys.Lett.B681:32-36,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 2 figures, published version
Scientific paper
10.1016/j.physletb.2009.09.060
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.
Fiore Roberto
Zoller Vladimir R.
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