Measurement of the reaction e +e −→ ηπ+π− in the center of mass energy interval 1350–2400 MeV

The e +e −→ ηπ + π − reaction has been measured in the center of mass energy interval 1350–2400 MeV by the magnetic detector DM2 at the Orsay storage ring DCI. Under the hypothesis of only one large resonance the cross section is not fit in a satisfactory way. The branching ratio τ −→ η − π 0 ν τ =(...

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Published in:Physics letters. B 1988-09, Vol.212 (1), p.133-138
Main Authors: Antonelli, A., Baldini, R., Calcaterra, S., Capon, G., Schioppa, M., Augustin, J.-E., Ayach, L., Cosme, G., Couchot, F., Dudelzak, B., Fulda, F., Grosdidier, G., Jean-Marie, B., Jullian, S., Lalanne, D., Lepeltier, V., Mane, F., Paulot, C., Riskalla, R., Roy, Ph, Szklarz, G., Ajaltouni, Z., Falvard, A., Jousset, J., Michel, B., Montret, J.C., Bisello, D., Busetto, G., Pescara, L., Sartori, P., Stanco, L.
Format: Article
Language:English
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Summary:The e +e −→ ηπ + π − reaction has been measured in the center of mass energy interval 1350–2400 MeV by the magnetic detector DM2 at the Orsay storage ring DCI. Under the hypothesis of only one large resonance the cross section is not fit in a satisfactory way. The branching ratio τ −→ η − π 0 ν τ =(0.13 ± 0.02)% is deduced via CVC from the above measurement.
ISSN:0370-2693
1873-2445
DOI:10.1016/0370-2693(88)91250-6