Abstract
In a Deck-model description of meson diffraction dissociation, we study the contribution made to the low-mass enhancement by the vector-meson-exchange Deck amplitudes. The vector-exchange amplitudes are parametrized with the help of data on the electroproduction of rho mesons. Cross sections for vector exchange are compared to the standard pseudoscalar-meson-exchange Deck results are are found to be comparable in specific cases. A detailed spin and helicity amplitude analysis shows that the vector-exchange Deck amplitudes provide a low-mass system which satisfies approximate s-channel helicity conservation, whereas the pseudoscalar-exchange terms yield approximate t-channel helicity conservation. Combining the two contributions, we show that approximate s-channel helicity conservation holds in Kp ..-->.. (rhoK) p and in Kp ..-->.. (..omega..K) p. However, t-channel helicity conservation is expected in Kp ..-->.. (K*..pi..) p, ..pi..p ..-->.. (rho..pi..) p, and Kp ..-->.. (phiK) p. These results agree with data. The relevance of these results to the interpretation of the Q-meson-resonance region is discussed.
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