Observation of resonances in the reaction p̄p → π0ηη at 1.94 GeV/c

A. Abele, B. Adomeit, C. Amsler, C. A. Baker, B. M. Barnett, C. J. Batty, M. Benayoun, A. Berdoz, K. Beuchert, S. Bischoff, P. Blüm, K. Braune, D. V. Bugg, T. Case, O. Cramer, V. Credé, K. M. Crowe, T. Degener, N. Djaoshvili, S. Von DombrowskiM. Doser, W. Dünnweber, A. Ehmanns, D. Engelhardt, M. A. Faessler, P. Giaritta, R. P. Haddock, F. H. Heinsius, M. Heinzelmann, A. Herbstrith, M. Herz, N. P. Hessey, P. Hidas, C. Hodd, C. Holtzhaußen, D. Jamnik, H. Kalinowsky, B. Kämmle, P. Karamel, J. Kisiel, E. Klempt, H. Koch, M. Kunze, U. Kurilla, M. Lakata, R. Landua, J. Lüdemann, H. Matthäy, R. McCrady, J. Meier, C. A. Meyer, R. Ouared, F. Ould-Saada, K. Peters, B. Pick, C. Pietra, C. N. Pinder, M. Ratajczak, C. Regenfus, S. Resag, W. Röthel, P. Schmidt, R. Seibert, S. Spanier, H. Stöck, C. Straßburger, U. Strohbusch, M. Suffert, J. S. Suh, U. Thoma, M. Tischhäuser, I. Uman, C. Völcker, S. Wallis-Plachner, D. Walther, U. Wiedner, K. Wittmack, B. Zou

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Antiproton-proton annihilation into π0ηη has been studied with the Crystal Barrel spectrometer at CERN at an incident beam momentum of 1.94GeV/c. The data were taken with a trigger requiring neutral final states. A new isovector state, the a2(1660) decaying to π0η, is observed. In the ηη invariant mass region around 2.1 GeV/c2, strong production of a heavy resonance is required, but our analysis does not distinguish between JP = 0+, 2+ and 4+. The production of the f0(1500) in reactions in flight is also observed.

Original languageEnglish
Pages (from-to)67-79
Number of pages13
JournalEuropean Physical Journal C
Volume8
Issue number1
DOIs
Publication statusPublished - 1999
Externally publishedYes

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Physics and Astronomy (miscellaneous)

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    Abele, A., Adomeit, B., Amsler, C., Baker, C. A., Barnett, B. M., Batty, C. J., Benayoun, M., Berdoz, A., Beuchert, K., Bischoff, S., Blüm, P., Braune, K., Bugg, D. V., Case, T., Cramer, O., Credé, V., Crowe, K. M., Degener, T., Djaoshvili, N., ... Zou, B. (1999). Observation of resonances in the reaction p̄p → π0ηη at 1.94 GeV/c. European Physical Journal C, 8(1), 67-79. https://doi.org/10.1007/s100529901069