"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. RI Fiore, Salvatore\/C-9722-2011; Di Domenico, Antonio\/G-6301-2011; De Lucia, Erika\/D-2250-2011; branchini, paolo\/A-4857-2011"
Ambrosino, F., Ceradini, F., DI MICCO, B. (2011). Measurement of sigma(e+e- -> pi+pi) from threshold to 0.85 GeV^2 using initial state radiation with the KLOE detector. PHYSICS LETTERS. SECTION B, 700(2), 102-110 [10.1016/j.physletb.2011.04.055].
Measurement of sigma(e+e- -> pi+pi) from threshold to 0.85 GeV^2 using initial state radiation with the KLOE detector
CERADINI, Filippo;DI MICCO, Biagio
2011-01-01
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. RI Fiore, Salvatore\/C-9722-2011; Di Domenico, Antonio\/G-6301-2011; De Lucia, Erika\/D-2250-2011; branchini, paolo\/A-4857-2011"I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
