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Radiative decay ofJ/ψ into γ π+ π? |
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| Authors: | J -E Augustin G Cosme F Couchot B Dudelzak F Fulda B Grelaud G Grosdidier B Jean-Marie S Jullian D Lalanne V Lepeltier B Louis F Mané C Paulot R Riskalla Ph Roy F Rumpf G Szklarz Z Ajaltouni A Falvard J Jousset B Michel J C Montret R Baldini S Calcaterra G Capon D Bisello G Busetto S Limentani M Nigro L Pescara M Posocco P Sartori L Stanco DM Collaboration |
| Institution: | 1. Laboratoire de l'Accélérateur Linéaire, Université de Paris-Sud, F-91405, Orsay, France 2. Laboratoire de Physique Corpusculaire, Université de Clermont II, BP 45, F-63170, Aubière, France 3. Laboratori Nazionali di Frascati dell'INFN, CP 13, I-00044, Frascati, Italy 4. Sezione di Padova, Dipartimento di Fisica dell'Università di Padova, e INFN, I-35131, Padua, Italy |
| Abstract: | The radiative decayJ/ψ → γ π+ π? has been studied using the 8.6 millionJ/ψ produced in the DM2 experiment at the DCIe +e? storage rings at Orsay. The π+ π? mass spectrum shows a cleanf 2 (1270) signal, and the possible presence of two other states at thef 2 (1720) andf 4 (2030) masses. For thef 2 (1270), the branching ratio BR(J/ψ →γf)xBR(f→π+ π?) is measured to be (7.50±0.30±1.12)×10?4, and the spin analysis prefers theJ=2 assignment, with helicity parametersx=0.83±0.06 andy=0.01±0.06. The existence of higher mass states is discussed. |
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