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Interactions of 17 GeV/c negative pions

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Il Nuovo Cimento (1955-1965)

Summary

Interactions of 17 GeV/c negative pions with nucleons and nuclei have been observed in a large heavy-liquid bubble chamber. Interactions with nucleons have been analysed using a two-vertex model of strong interactions. A striking feature of the results is the appearance of 55 events which can be explained as diffraction dissociation of the incident pion interacting coherently with a carbon nucleus. In these events the nucleus remains relatively undisturbed and the incident pion emerges as three pions. Analysis of the three-pion system indicates presence of ρ-meson and a possible three-particle resonance.

Riassunto

Si sono osservati in una grande camera a bolle a liquido pesante le interazioni di pioni negativi 17 GeV/c con nucleoni e nuclei. Si sono studiate le interazioni con i nucleoni servendosi di un modello a due vertici delle interazioni forti. Una caratteristica interessante dei risultati è la comparsa di 55 eventi, che possono essere spiegati come dissociazioni di diffrazione del pione incidente che interagisce in modo coerente con un nucleo di carbonio. In questi eventi il nucleo resta quasi indisturbato ed al posto del pione incidente riemergono tre pioni. Lo studio del sistema di tre pioni indica la presenza di un mesone ρ e di una probabile risonanza di tre particelle.

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Authors and Affiliations

  1. Department of Physics, University of California, Berkeley, Cal.

    F. R. Huson & W. B. Fretter

  2. École Polytechnique, Laboratoire de Physique, Paris

    F. R. Huson

Authors
  1. F. R. Huson
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  2. W. B. Fretter
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Additional information

Supported by Office of Naval Research Contract. Reproduction in whole or in part is permitted for any purpose of the United States Government.

The beam and run for this experiment were under the supervision ofA. Lagarrigue, and the other persons participating wereC. Baglin, H. H. Bingham, M. Bloch, D. Drijard, P. Mittner, A. Orkin-Lecourtois, P. Rançon, A. Rousset from the École Polytechnique, andB. de Raad, R. Salmeron andR. Voss from CERN.

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Huson, F.R., Fretter, W.B. Interactions of 17 GeV/c negative pions. Nuovo Cim 33, 1–24 (1964). https://doi.org/10.1007/BF02734058

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