Evidence for ηη resonances in antiproton-proton annihilations at 2950 < s < 3620 MeV

T. A. Armstrong*, D. Bettoni, V. Bharadwaj, C. Biino, G. Borreani, D. Broemmelsiek, A. Buzzo, R. Calabrese, A. Ceccucci, M. Church, P. Dalpiaz, P. F. Dalpiaz, R. Dibenedetto, D. Dimitroyannis, M. G. Fabbri, J. Fast, A. Gianoli, C. M. Ginsburg, K. Gollwitzer, A. HahnM. Hasan, S. Hsueh, R. Lewis, E. Luppi, M. Macrí, A. M. Majewska, M. Mandelkern, F. Marchetto, M. Marinelli, J. Marques, W. Marsh, M. Martini, M. Masuzawa, E. Menichetti, A. Migliori, R. Mussa, M. Pallavicini, S. Palestini, N. Pastrone, C. Patrignani, J. Peoples, L. Pesando, F. Petrucci, M. G. Pia, S. Pordes, P. Rapidis, R. Ray, J. Reid, G. Rinaudo, B. Roccuzzo, J. Rosen, A. Santroni, M. Sarmiento, M. Savrie, A. Scalisi, J. Schultz, K. K. Seth, A. Smith, G. A. Smith, M. Sozzi, S. Trokenheim, M. F. Weber, S. Werkema, Y. Zhang, J. Zhao, G. ioulas

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


We present the first high-statistics study of the ηη system over the mass range 1000-3000 MeV/c2. The experiment was performed at the Fermilab Antiproton Accumulator, and the data sample consists of six-photon final states produced in antiproton-proton annihilations at s in the range 2950-3620 MeV. We find evidence for three states with masses 1488 ± 10 MeV/c2, 1748 ± 10 MeV/c2 and 2104 ± 20 MeV/c2 respectively.

Original languageEnglish (US)
Pages (from-to)394-398
Number of pages5
JournalPhysics Letters B
Issue number3-4
StatePublished - Jun 17 1993

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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