We have measured the cross section of the radiative process e(+)e(-) -> pi(+)pi(-)gamma with the KLOE detector at the Frascati phi-factory DA(1)NE, from events taken at a CM energy W =1 GeV. Initial state radiation allows us to obtain the cross section for e(+)e(-) -> pi(+)pi(-), the pion form factor vertical bar F-pi vertical bar(2) and the dipion contribution to the muon magnetic moment anomaly, Delta alpha(pi pi)(mu) = (478.5 +/- 2.0(stat) +/- 5.0(syst) +/- 4.5(th)) x 10(-10) in the range 0.1 < M-pi pi(2) <0.85 GeV2, where the theoretical error includes a SU(3) chi PT estimate of the uncertainty on photon radiation from the final pions. The discrepancy between the Standard Model evaluation of alpha(mu) and the value measured by the Muon g-2 collaboration at BNL is confirmed. (C) 2011 Elsevier B.V. All rights reserved.
Measurement of sigma-(e(+)e(-) -> pi(+)pi(-)) from threshold to 0.85 GeV2 using initial state radiation with the KLOE detector / F., Ambrosino; F., Archilli; P., Beltrame; G., Bencivenni; Bini, Cesare; C., Bloise; S., Bocchetta; F., Bossi; P., Branchini; G., Capon; T., Capussela; F., Ceradini; P., Ciambrone; E., De Lucia; DE SANTIS, Antonio; P., De Simone; DE ZORZI, Guido; A., Denig; DI DOMENICO, Antonio; C., Di Donato; B., Di Micco; M., Dreucci; G., Felici; Fiore, Salvatore; Franzini, Paolo; C., Gatti; Gauzzi, Paolo; S., Giovannella; E., Graziani; M., Jacewicz; W., Kluge; J., Lee Franzini; D., Leone; P., Massarotti; S., Meola; S., Miscetti; S., Muller; F., Murtas; M., Napolitano; F., Nguyen; A., Passeri; Patera, Vincenzo; P., Santangelo; C., Taccini; L., Tortora; G., Venanzoni; R., Versaci. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 700:2(2011), pp. 102-110. [10.1016/j.physletb.2011.04.055]
Measurement of sigma-(e(+)e(-) -> pi(+)pi(-)) from threshold to 0.85 GeV2 using initial state radiation with the KLOE detector
BINI, Cesare;DE SANTIS, ANTONIO;DE ZORZI, Guido;DI DOMENICO, Antonio;FIORE, SALVATORE;FRANZINI, Paolo;GAUZZI, Paolo;PATERA, Vincenzo;
2011
Abstract
We have measured the cross section of the radiative process e(+)e(-) -> pi(+)pi(-)gamma with the KLOE detector at the Frascati phi-factory DA(1)NE, from events taken at a CM energy W =1 GeV. Initial state radiation allows us to obtain the cross section for e(+)e(-) -> pi(+)pi(-), the pion form factor vertical bar F-pi vertical bar(2) and the dipion contribution to the muon magnetic moment anomaly, Delta alpha(pi pi)(mu) = (478.5 +/- 2.0(stat) +/- 5.0(syst) +/- 4.5(th)) x 10(-10) in the range 0.1 < M-pi pi(2) <0.85 GeV2, where the theoretical error includes a SU(3) chi PT estimate of the uncertainty on photon radiation from the final pions. The discrepancy between the Standard Model evaluation of alpha(mu) and the value measured by the Muon g-2 collaboration at BNL is confirmed. (C) 2011 Elsevier B.V. All rights reserved.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
