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Observation of a 2+ + resonance at 1515 MeV in proton-antiproton annihilations into 3π0

1991; Elsevier BV; Volume: 260; Issue: 1-2 Linguagem: Inglês

10.1016/0370-2693(91)90999-7

1873-2445

E. Aker, C. Amsler, I. Augustin, C.A. Baker, B. M. Barnett, C.J. Batty, R. Beckmann, P. Birien, J. Bistirlich, P. Blüm, V. Singh, H. Bossy, K. Braune, M. J. Burchell, T. Case, S. Cierjacks, K. M. Crowe, K. Dederichs, W. Dünnweber, D. Engelhardt, M.A. Faessler, C. Félix, G. Folger, R.P. Haddock, F. H. Heinsius, N. P. Hessey, P. Hidas, P. Illinger, D. Jamnik, H. Kalinowsky, B. Kämmle, T. Kiel, E. Klempt, H. Koch, K. Königsmann, M. Kunze, R. Landua, B. Lewendel, H. Matthaey, M. Merkel, C. A. Meyer, U. Meyer‐Berkhout, L. Montanet, C. Pegel, Κ. Peters, S. Ravndal, A.H. Sanjari, E. Schäfer, Bernhard Schmid, W. Schott, U. Strohbusch, M. Suffert, C. Sutton, D. Urner, D. Walther, S.M. Walther, U. Wiedner, N. Winter, J. Zoll, Č. Zupančič,

Nuclear physics research studies

Antiproton-proton annihilations at rest into 3π0 are analyzed in terms of π0π0 final state interactions. A JPC = 2+ + resonance at a mass of 1515 ± 10 MeV with a width of 120 ± 10 MeV is required to explain the data. This result is supported by previous observations made on the ππ system in pp and pn annihilations which show that the resonance has I = 0. This resonance is practically degenerate in mass with the f′2 (1525) but the two resonances have very different production and decay characteristics.