Measurement Of The Hadronic Cross Section At Da Phi Ne With The Kloe Detector

A Aloisio, F Ambrosino, A Antonelli,M Antonelli, C Bacci, G Bencivenni, S Bertolucci, C Bini, C Bloise, V Bocci, F Bossi, P Branchini,Sa Bulychjov, R Caloi, P Campana, G Capon, T Capussela, G Carboni,G Cataldi, F Ceradini, F Cervelli, F Cevenini, G Chiefari, P Ciambrone, S Conetti,E De Lucia,P De Simone,G De Zorzi,S Dell'Agnello, A Denig,A Di Domenico,C Di Donato,S Di Falco,B Di Micco, A Doria,M Dreucci, O Erriquez, A Farilla, G Felici,A Ferrari,Ml Ferrer, G Finocchiaro, C Forti, A Franceschi, P Franzini, C Gatti,P Gauzzi, S Giovannella, E Gorini, E Graziani, M Incagli,W Kluge,V Kulikov, F Lacava, G Lanfranchi, J Lee-Franzini, D Leone, F Lu, M Martemianov, M Matsyuk, W Mei,L Merola,R Messi, S Miscetti, M Moulson, S Muller, F Murtas, M Napolitano, A Nedosekin, F Nguyen, M Palutan, E Pasqualucci, L Passalacqua, A Passeri, V Patera, F Perfetto, E Petrolo, L Pontecorvo,M Primavera, F Ruggieri, P Santangelo, E Santovetti, G Saracino,Rd Schamberger, B Sciascia, A Sciubba, F Scuri, I Sfiligoi, A Sibidanov, I Spadaro, E Spiriti,M Testa, L Tortora, P Valente, B Valeriani, G Venanzoni, S Veneziano, A Ventura, S Ventura, R Versaci, I Villella, G Xu

HADRON SPECTROSCOPY（2004）

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摘要

We have measured the cross section or(e(+)e(-) --> pi(+)pi(-)gamma) as a function of the pi(+)pi(-) invariant mass, M-pipi with the KLOE detector at DAPhiNE ( W = m(phi) = 1.02 GeV). The photon in the above process is due to Initial State Radiation. Dividing by a theoretical radiator function, we obtain the cross section sigma(e(+)e(-) --> pi(+)pi(-)) for the mass range 0.37 < M-pipi(2) < 0.93 GeV2. We extract the pion form factor and the hadronic contribution to the muon anomaly, a(mu) .

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