$Q^2$-dependence of backward pion multiplicity in neutrino-nucleus interactions

Details $Q^2$-dependence of backward pion multiplicity in neutrino-nucleus interactions $Q^2$-dependence of backward pion multiplicity in neutrino-nucleus interactions

2001-11-02

arxiv.org/abs/nucl-th/0111006v2

Phys.Lett. B527 (2002) 73-79

Physics

Nuclear Physics

Nuclear Theory

15 pages, 4 figures

Scientific paper

10.1016/S0370-2693(02)01164-4

The production of pions emitted backward in inelastic neutrino-nucleus interactions is analyzed within the impulse approximation in the framework of the dual parton model. We focus on the $Q^2$-dependence of the multiplicity of negative pions, normalized to the total cross section of the reaction $\nu + A \to \mu + X$. The inclusion of planar (one-Reggeon exchange) and cylindrical (one-Pomeron exchange) graphs leads to a multiplicity that decreases as $Q^2$ increases, in agreement with recent measurements carried out at CERN by the NOMAD collaboration. A realistic treatment of the high momentum tail of the nucleon distribution in a nucleus also allows for a satisfactory description of the semi-inclusive spectrum of backward pions.

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