In a search for resonances coupled to the ppπ- system, we have studied π-p interactions at 16 GeV/c giving a forward antiproton, using the Omega spectrometer at CERN. In the final states involving a p, p and π- we observe a 5.6 (6.3) standard deviation enhancement in the ppπ- mass spectrum at (2.95 ± 0.01) GeV with a width consistent with the resolution (σ = 15 MeV). The production cross section × branching ratio is estimated to be of the order 1 μb. The data are consistent with a resonance decaying partly via intermediate pp final states.
Evidence for a narrow width boson of mass 2.95 GeV / C. Evangelista, B. Ghidini, A. Palano, V. Picciarelli, G. Zito, P. Mättig, K. Müller, E. Paul, W. Rühmer, B. French, W. Mitaroff, C. Palazzi-Cerrina, R. Strub, A. Thompson, P. Woodworth, M. Edwards, T. Armstrong, J. Gordon, I. Hughes, G. Lewis, R. Turnbull, C. Best, R. Donald, D. Edwards, M. Houlden, G. Costa, L. Mandelli, S. Pensotti, L. Perini, D. Miller, H. Lambacher. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 72:1(1977), pp. 139-143.
Evidence for a narrow width boson of mass 2.95 GeV
L. Perini;
1977
Abstract
In a search for resonances coupled to the ppπ- system, we have studied π-p interactions at 16 GeV/c giving a forward antiproton, using the Omega spectrometer at CERN. In the final states involving a p, p and π- we observe a 5.6 (6.3) standard deviation enhancement in the ppπ- mass spectrum at (2.95 ± 0.01) GeV with a width consistent with the resolution (σ = 15 MeV). The production cross section × branching ratio is estimated to be of the order 1 μb. The data are consistent with a resonance decaying partly via intermediate pp final states.
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