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Study of the π+π+π-π- system centrally 0 produced by incident π+ andp beams at 85 GeV/c

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Zeitschrift für Physik C Particles and Fields

Abstract

The reactions π+ p→π+(π+π+π-π-)p andpp→p(π+π+π-π-)p, where the (π+ π+ π- π-) system is centrally produced have been studied at 85 GeV/c. The π+π+π-π- mass spectrum shows evidence for thef 1 (1285) meson with a mass of 1278±2 MeV and width 41±12 MeV which decays mainly through ρ0(770)π+π-. Thef 1(1285) is also observed in the ηπ+π- channel. There is no significant evidence for ηππ or 4π decay modes of thef 1(1420). The ρ0ρ0 production is found to be small. A Dalitz plot analysis of the 3π system shows evidence fora 2 (1320) production and for a large contribution of theJ PC=1++ ρπ wave.

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Author notes

  1. T. A. Armstrong

    Present address: Pennsylvania State University, University Park, USA

Authors and Affiliations

  1. CERN, CH-1211, Geneva 23, Switzerland

    T. A. Armstrong & B. R. French

  2. Physics Department, University of Birmingham, Birmingham, UK

    I. J. Bloodworth, J. N. Carney, J. B. Kinson, A. Kirk, I. C. Print, O. Villalobos Baillie & M. F. Votruba

  3. Dip. di Fisica dell'Università and Sez. INFN, Bari, Italy

    B. Ghidini, V. Lenti, A. Palano & G. Zito

  4. Nuclear Physics Department, Athens University, Athens, Greece

    G. Vassiliadis

  5. LPNHE, Universités de Paris VI et VII, Paris, France

    R. Zitoun

Authors
  1. T. A. Armstrong
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  2. I. J. Bloodworth
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  3. J. N. Carney
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  4. B. R. French
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  5. B. Ghidini
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  6. J. B. Kinson
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  7. A. Kirk
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  8. V. Lenti
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  9. A. Palano
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  10. I. C. Print
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  11. G. Vassiliadis
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  12. O. Villalobos Baillie
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  13. M. F. Votruba
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  14. G. Zito
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  15. R. Zitoun
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WA 76 Collaboration

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WA 76 Collaboration., Armstrong, T.A., Bloodworth, I.J. et al. Study of the π+π+π-π- system centrally 0 produced by incident π+ andp beams at 85 GeV/c. Z. Phys. C - Particles and Fields 43, 55–61 (1989). https://doi.org/10.1007/BF02430610

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  • DOI: https://doi.org/10.1007/BF02430610

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