The pion electromagnetic form factor in the time-like energy range 1.35 ⩽ s ⩽ 2.4 GeV

Dario Bisello,G. Busetto,Andrea Castro, C. Milani, M. Nigro, L. Pescara, M. Posocco, P. Sartori,Luca Stanco,Ziad Ajaltouni, Alain Falvard, J. Jousset, B. Michel, Jean-Claude Montret,A. Antonelli, R. Baldini,A. Calcaterra,M. Schioppa,J. E. Augustin,G. Cosme,F. Couchot, B. Dudelzak, F. Fulda, G. Grosdidier, B. Jean-Marie, S. Jullian,D. Lalanne,V. Lepeltier,F. Mane, C. Paulot, R. Riskalla,Ph. Roy, G. Szklarz

Physics Letters B（1989）

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摘要

Abstract The e+e− → π+π− cross section has been measured from about 280 events (an order of magnitude more than the previous world statistics) in the energy interval 1.35 ⩽ s ⩽ 2.4 GeV with the DM2 detector at DCI. The pion squared form factor |Fπ|2 shows a deep minimum around 1.6 GeV/c2 and is better fit under the hypothesis of two ϱ-like resonance ⋍0.25 GeV/c2 wide with 1.42 and 1.77 GeV/c2 masses.

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