Abstract
Recent data forpp elastic scattering at large momentum transfer find a behaviour close tot −8, independent of energy, throughout the ISR energy range. This behaviour is in agreement with the triple-scattering model, proposed some years ago. If this interpretation is correct, it provides evidence that gluons have spin 1. The differential cross-sections forpp andp $$\bar p$$ elastic scattering are predicted to be equal at high energy, for values oft that are large but much less thans. The case of πp elastic scattering at larget is considered. It is shown that a multiple-scattering mechanism gives energy-independent behaviour at sufficiently high energy. We expect the cross-section to vary ast −7, but this conclusion is not as clear-cut as thet −8 behaviour for thepp case.
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