Delta s density in a proton and unpolarized lepton - polarized proton scatterings

Abstract

It is shown that the parity--violating deep--inelastic scatterings of unpolarized charged leptons on polarized protons, ${\ell }^{\mp }+\vec{P}\to \stackrel{(-)}{{\nu }_{\ell }}+X$, could provide a sensitive test for the behavior and magnitude of the polarized strange--quark density in a proton. Below charm threshold these processes are also helpful to uniquely determine the magnitude of individual polarized parton distributions.

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