η-decays into three pions

• Published in: Physics letters. B Vol. 346; no. 1; pp. 203 - 207
• Main Authors: Amsler, C., Armstrong, D.S., Augustin, I., Baker, C.A., Barnett, B.M., Batty, C.J., Beuchert, K., Birien, P., Blüm, P., Bossingham, R., Braune, K., Brose, J., Bugg, D.V., Burchell, M., Case, T., Cooper, A., Cramer, O., Crowe, K.M., Degener, T., Dietz, H.P., Dombrowski, S.v., Doser, M., Dünnweber, W., Engelhardt, D., Englert, M., Faessler, M.A., Felix, C., Folger, G., Glantz, R., Hackmann, R., Haddock, R.P., Heinsius, F.H., Herz, M., Hessey, N.P., Hidas, P., Illinger, P., Jamnik, D., Kalinowsky, H., Kämmle, B., Kiel, T., Kisiel, J., Klempt, E., Kobel, M., Koch, H., Kolo, C., Königsmann, K., Kunze, M., Lakata, M., Landua, R., Lüdemann, J., Matthäy, H., McCrady, R., Merkel, M., Merlo, J.P., Meyer, C.A., Montanet, L., Noble, A., Ould-Saada, F., Peters, K., Pinder, C.N., Pinter, G., Ravndal, S., Regenfus, C., Salk, J., Schäfer, E., Schmid, B., Schmidt, P., Seibert, R., Spanier, S., Stöck, H., Straßburger, C., Strohbusch, U., Suffert, M., Thoma, U., Tischhäuser, M., Urner, D., Völcker, C., Walter, F., Walther, D., Wiedner, U., Winter, N., Zoll, J., Zou, B.S., Zupančič, Č.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1995; Elsevier
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(95)00094-2

The branching ratios Γ(η → 3π 0) Γ(η → π +π −π 0) = 1.44 ± 0.09 ± 0.10 and Γ(η → γγ) Γ(η → π +π −π 0) = 1.78 ± 0.10 ± 0.13 have been determined using the Crystal Barrel detector at LEAR. The latter ratio yields a partial width of Γ( η → π + π − π 0) = 0.26 ± 0.03 keV using the known value for Γ( η → γγ). The η → π + π − π 0) Dalitz plot is compared to the predictions of chiral perturbation theory.