Evidence for a narrow width boson of mass 2.95 GeV

In a search for resonances coupled to the p pπ − 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 p pπ − mass spectrum a...

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Published in:Physics letters. B 1977-01, Vol.72 (1), p.139-143
Main Authors: Evangelista, C., Ghidini, B., Palano, A., Picciarelli, V., Zito, G., Mättig, P., Müller, K., Paul, E., Rühmer, W., French, B.R., Mitaroff, W.A., Palazzi-Cerrina, C., Strub, R., Thompson, A.S., Woodworth, P.L., Edwards, M., Armstrong, T., Gordon, J., Hughes, I.S., Lewis, G.M., Turnbull, R.M., Best, C., Donald, R.A., Edwards, D.N., Houlden, M.A., Costa, G., Mandelli, L., Pensotti, S., Perini, L., Miller, D.H., Lambacher, H.D.
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Language:English
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Summary:In a search for resonances coupled to the p pπ − 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 p pπ − 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 p p final states.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(77)90081-8