Proton-antiproton annihilation into ηηπ-observation of a scalar resonance decaying into ηη

• Published in: Physics letters. B 1992-09, Vol.291 (3), p.347-354
• Main Authors: Amsler, C., Augustin, I., Baker, C.A., Barnett, B.M., Batty, C.J., Beckmann, R., Beuchert, K., Birien, P., Bistirlich, J., Blüm, P., Bossingham, R., Bossy, H., Braune, K., Bugg, D.V., Burchell, M., Case, T., Cooper, A., Crowe, K.M., Dietz, H.P., von Dombrowski, S., Doser, M., Dünnweber, W., Engelhardt, D., Englert, M., Faessler, M.A., Felix, C., Folger, G., Hackmann, R., Haddock, R.P., Heinsius, F.H., Hessey, N.P., Hidas, P., Illinger, P., Jamnik, D., Jávorfi, Z., Kalinowsky, H., Kämmle, B., Kiel, T., Klempt, E., Koch, H., Königsmann, K., Kolo, C., Kunze, M., Landua, R., Lüdemann, J., Matthaey, H., Merkel, M., Merlo, J.P., Meyer, C.A., Meyer-Berkhout, U., Montanet, L., Noble, A., Peters, K., Pinter, G., Ravndal, S., Sanjari, A.H., Schäfer, E., Schmid, B., Schmidt, P., Spanier, S., Straβburger, C., Strohbusch, U., Suffert, M., Urner, D., Völcker, C., Walther, D., Wiedner, U., Winter, N., Zoll, J., Zupancic, C.
• Format: Article
• Language: English
• Subjects: Baryons (including antiparticles); Classical and quantum physics: mechanics and fields; Exact sciences and technology; Physics; Properties of specific particles; The physics of elementary particles and fields; Theory of quantized fields
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(92)91057-G

The results of a measurement of p̄p annihilation at rest into ηηπ 0 are presented. Assuming a resonance dominated model for the annihilation process an isoscalar J PC =0 ++ resonance decaying into ηη is observed with a mass of 1560±25 MeV/ c 2 and a width of 245±50 MeV/ c 2.