Nuclear Attenuation of Fast Hadrons Produced in Charged-Current Neutrino and Antineutrino Interactions in Neon

The production of hadrons in charged-current (anti)neutrino interactions is studied with the bubble chamber BEBC exposed ot the CERN (anti)neutrino wide-band beam. Fast-hadron production in a neon target is found to be attennuated as compared to that in a hydrogen target. This feature is discussed within the theoretical models based on the idea of a hadron formation length. The experimental results favour the `constituent' over the `yo-yo' length concept, and suggest a quark cross-section in the order of 3mb.Comment: 14 pages + 7 figures, ps fil

Polarization of &#923;<SUP>0</SUP> hyperons in K<SUP>-</SUP>p interactions

The polarization of the &#923;0 hyperon produced inK - p interactions at 110 GeV/c shows a strong dependence on the transverse momentum p t of the &#923;0 and no significant dependence on x F . The polarization for large p t is negative in the proton hemisphere and positive in the kaon hemisphere. In theproton hemisphere it is compared with the results of other K - p experiments at lower energies as well as with reactions induced by p, p-, &#960;+, &#960;- and K +. The comparison is performed separately for K - p&#8594;&#923; 0 KK+pions and K - p&#8594;&#923; 0+pions showing an analogous behaviour in the former channel. In the kaon hemisphere the comparison with other K - p experiments at lower energy shows a p t -dependence of the &#923;0 polarization which changes with energy. The experimental results are discussed in terms of current quark models and of the Mueller-Regge phenomenology. The model predictions reproduce the trend of the data qualitatively well but fail in describing some details