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Study of (πN) and (ππN) mass enhancements in nucleon diffraction dissociation) mass enhancements in nucleon diffraction dissociation

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Il Nuovo Cimento A (1965-1970)

Summary

A study of (πN) mass enhancements in the diffraction dissociations, π+p → π+(π0p)dd and π+(π+n)dd at 16 GeV/c, has been made in terms of the massM and widthΓ of diffractively produced (πN) and (ππN) mass enhancements. The values ofM andΓ observed areM=(1344±5), (1451±7), (1639±7) MeV andΓ=(66±14), (132±22), (96±20) MeV, respectively. From the detailed comparison of world data, we found the systematic difference ofM andΓ between (πN) or (ππN) enhancements and resonances produced in formation experiments. It is shown that Deck-resonance interference cannot give an adequate explanation for these observations. We discuss possible interpretations for reaction mechanisms of producing nucleon mass enhancements in connection with the nature of the pomeron exchanged.

Riassunto

È stato fatto uno studio dell’incremento di massa (πN) nelle dissociazioni diffrattive π+p → π+(π0p)dd e π+(π+n)dd a 16 GeV/c in termini della massaM e dell’ampiezzaΓ di incrementi di massa (πN) e (ππN) prodotti diffrattivamente. I valori diM eΓ osservati sonoM=(1344±5), (1451±7), (1639±7) MeV eΓ=(66±14), (132±22), (96±20) MeV, rispettivamente. Dal confronto dettagliato dei dati globali si trova una sistematica differenza diM eΓ fra incrementi (πN) o (ππN) e risonanze prodotte in esperimenti di formazione. Si mostra che l’interferenza fra risonanza e il Deck non può dare una spiegazione adeguata a queste osservazioni. Si discutono interpretazioni possibili per i meccanismi di reazione di produzione di incrementi della massa del nucleone in connessione con la natura del pomerone scambiato.

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Authors and Affiliations

  1. Department of Physics, Tokyo Metropolitan University, Setagaya, Tokyo

    C. Fukunaga, R. Hamatsu, T. Hirose, S. Kitamura & T. Yamagata

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  1. C. Fukunaga
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  2. R. Hamatsu
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  3. T. Hirose
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  4. S. Kitamura
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  5. T. Yamagata
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Fukunaga, C., Hamatsu, R., Hirose, T. et al. Study of (πN) and (ππN) mass enhancements in nucleon diffraction dissociation) mass enhancements in nucleon diffraction dissociation. Nuov Cim A 58, 199–218 (1980). https://doi.org/10.1007/BF02730383

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