A two-component model definition of two-body nucleon diffraction dissociation in πp → π(Nπ)reactions at 3.9 GeV/c and comparison with other experiments |
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Authors: | G Berlad J Grunhaus ES Hafen MF Hodous RI Hulsizer U Karshon V Kistialowsky A Levy IA Pless PC Trepagnier J Wolfson RK Yamamoto |
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Institution: | Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA |
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Abstract: | Four low-mass “diffractive like” reactions π±p → π±(pπ0) and π±p → π±(nπ+) have been studied at 3.9 GeV/c incident pion momentum. These channels have been studied in the framework of a two-component model and we have proposed a definition of the diffraction dissociation amplitude. The following three features of the data are discussed: (1) an apparent violation of the predictions of isospin invariance for the cross section ratios, (2) the marked anisotropy of the s-channel helicity distributions and (3) the absence of the cross-over effect in the differential cross sections. The predictions of a two-component model previously used to explain the low mass enhancement 1] and s- and t-channel helicity non-conservation 2] are seen to be in agreement with these observations. Predictions are also made for higher energy incident pions and incident K, p, and projectiles. These predictions are compared with available data including recent results at Fermilab and ISR energies. |
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