Anomalous A-dependence of diffractive leptoproduction of radial excitation $ρ'(2S)$

Details Anomalous A-dependence of diffractive leptoproduction of radial excitation $ρ'(2S)$ Anomalous A-dependence of diffractive leptoproduction of radial excitation $ρ'(2S)$

1994-05-23

arxiv.org/abs/nucl-th/9405025v1

Phys.Lett. B339 (1994) 194-200

Physics

Nuclear Physics

Nuclear Theory

10 pages, 4 figures (to be requested), Juelich preprint KFA-IKP(Th)-1994-18

Scientific paper

10.1016/0370-2693(94)91154-1

We predict a strikingly different $A$ and $Q^{2}$ dependence of quasielastic leptoproduction of the $\rho^{0}(1S)$-meson and its radial excitation $\rho '(2S)$ on nuclei. Whereas for the $\rho^{0}$ production nuclear transparency $T_{A}$ decreases monotonically with $A$, for the $\rho'$ nuclear transparency $T_{A}$ can have the counterintuitive nonmonotonic $A$-dependence, having the minimum for light nuclei, and increasing with $A$ for medium and heavy nuclei. Strong enhancement of the $\rho ' /\rho^{0}$ cross section ratio makes nuclear targets the $\rho '$-factory. The origin of the anomalous $A$-dependence is in the interplay of color transparency effects with the nodal structure of the $\rho '$ wave function. The predicted effects take place at moderate $Q^{2}\lsim (2-3)$GeV$^{2}$, which can be explored in high statistics experiments at CEBAF.

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