Evidence for the existence of a narrow η0π± resonance at 975 MeV, interpreted as a decay of the σ ± meson, and evidence for a σ ± π ∓ decay of the D 0 meson

• Published in: Physics letters. B Vol. 28; no. 5; pp. 353 - 355
• Main Authors: Defoix, C., Rivet, P., Siaud, J., Conforto, B., Widgoff, M., Shively, F.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1968
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(68)90129-9

Two peaks are observed in η 0 π ± and η 0π +π − effective mass distributions near 975 MeV and 1310 MeV respectively, in events fitting the reaction p ̄ p → 3π + 3π − π 0 . The narrow η 0 π ± peak is interpreted as a new evidence for the existence of the σ +- meson. The second peak is strongly correlated to the first one and is interpreted as evidence for the decay D 0 → σ ± π ∓.