Using π 600 pb-1 collected with the KLOE detector at DAPdblNE, we have studied the production cross section ofπ+π-ππ andππ final states in e+e- collisions at center of mass energies between 1000 and 1030 MeV. By fitting the observed in- terference pattern around M for both final states, we extract a measurement (pre- liminary) for the ratio ππ (→ →π)/ π π (→ →π+π-π0) = 0.0934±0.0022. Since these two final states represent the 98% of the → decay channels, we use unitarity to derive BR(→ →π+π- π) = (89.94±0.23)% and BR(→ →0) = (8.40±0.19)%. Moreover, the parameters describing the e+e- →π+π-ππ reaction around M are used to extract the branching fraction for the OZI and G-parity violating →→πdecay: BR(→ →π0) = (5.63 ± 0.70) × 10-5.
Study of the process e+e- → → ω π0 with the KLOE detector / Ambrosino, F.; Corvino, M.; Massarotti, P.; Mirra, M.; Napolitano, M.; Saracino, G.. - (2007). (Intervento presentato al convegno 23rd International Symposium on Lepton-Photon Interactions at High Energy, LP 2007 tenutosi a Daegu, kor nel 2007).
Study of the process e+e- → → ω π0 with the KLOE detector
Ambrosino F.;Corvino M.;Massarotti P.;Napolitano M.;Saracino G.
2007
Abstract
Using π 600 pb-1 collected with the KLOE detector at DAPdblNE, we have studied the production cross section ofπ+π-ππ andππ final states in e+e- collisions at center of mass energies between 1000 and 1030 MeV. By fitting the observed in- terference pattern around M for both final states, we extract a measurement (pre- liminary) for the ratio ππ (→ →π)/ π π (→ →π+π-π0) = 0.0934±0.0022. Since these two final states represent the 98% of the → decay channels, we use unitarity to derive BR(→ →π+π- π) = (89.94±0.23)% and BR(→ →0) = (8.40±0.19)%. Moreover, the parameters describing the e+e- →π+π-ππ reaction around M are used to extract the branching fraction for the OZI and G-parity violating →→πdecay: BR(→ →π0) = (5.63 ± 0.70) × 10-5.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
