Study of π−N→ηπ−N and π−N→η′π−N reactions at 37 GeV/c

• Published in: Physics letters. B 1993-08, Vol.313 (1-2), p.276-282
• Main Authors: Beladidze, G.M., Berdnikov, E.B., Bityukov, S.I., Borisov, G.V., Dzhelyadin, R.I., Ekimov, A.V., Gouz, Yu.P., Ivanyushenkov, Yu.M., Kachaev, I.A., Karyukhin, A.N., Khokhlov, Yu.A., Klyuchnikov, G.A., Konstantinov, V.F., Kostrikov, M.E., Kostyukhin, V.V., Kriushin, A.A., Lomtadze, T.A., Matveyev, V.D., Ostankov, A.P., Ryabchikov, D.I., Sekhniaidze, G.G., Starchenko, E.A., Tskhadadze, E.G., Vishnevsky, N.K., Vlasov, E.V., Zaitsev, A.M.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(93)91224-B

A partial-wave analysis of the ηπ− and η′π− systems produced in the reactions π−N→η(η′)π−N on a berylium target at a beam momentum of pπ− = 37 GeV/c is performed. It is shown that (1) all the waves with negative exchange naturality are negligibly small for both systems; (2) the matrix element squared of the P+ wave with JPC = 1−+ for the η′π− system significantly exceeds that for the ηπ− system, which could testify to the dominance of systems with a valence gluon (qq̄g) in the JPC = 1−+ wave formation; (3) the ratio R = Br(a2−→η′π−)/BR(a−2→ηπ−) = (4.7±1.0(stat.) ±0.4(syst.)) × 10−2 has been obtained.