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Babusci, D; Badoni, D; Balwierz-Pytko, I; Bencivenni, G; Bini, C; Bloise, C; Bossi, F; Branchini, P; Budano, A; Caldeira Balkestaahl, L; Capon, G; Ceradini, F; Ciambrone, P; Curciarello, F; Czerwinski, E; Dane, E; De Leo, V; De Lucia, E; De Robertis, G; De Santis, A; De Simone, P; Di Domenico, A; Di Donato, C; Domenici, D; Erriquez, O; Fanizzi, G; Felici, G; Fiore, S; Franzini, P; Gauzzi, P; Giardina, G; Giovannella, S; Gonnella, F; Graziani, E; Happacher, F; Heijkenskjoeld, L; Hoeistad, B; Iafolla, L; Iarocci, E; Jacewicz, M; Johansson, T; Kluge, W; Kupsc, A; Lee-Franzini, J; Loddo, F; Lukin, P; Mandaglio, G; Martemianov, M; Martini, M; Mascolo, M; et. al
Physics letters. B, 03/2013, Volume: 720, Issue: 4-5Journal Article
We have measured the ratio I (e + e - a pi + pi - gamma ) / I (e + e - a mu + mu - gamma ) , with the KLOE detector at DAIBBNE for a total integrated luminosity of similar to 240 pb - 1 . From this ratio we obtain the cross section I (e + e - a pi + pi -) . From the cross section we determine the pion form factor | F pi | 2 and the two-pion contribution to the muon anomaly a mu for 0.592 < M pi pi < 0.975 GeV , I pi pi a mu = (385.1 +/- 1.1 stat +/- 2.7 sys + theo) X 10 - 10 . This result confirms the current discrepancy between the Standard Model calculation and the experimental measurement of the muon anomaly.
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