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., A., F., A., P., B., G., B., Bini, C., C., B., S., B., F., B., P., B., G., C., T., C., F., C., P., C., E., D.L., DE SANTIS, A., P., D.S., DE ZORZI, G., A., D., DI DOMENICO, A., C., D.D., et al.. - 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.
