Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2010-06-28
Phys.Lett.B700:102-110,2011
Physics
High Energy Physics
High Energy Physics - Experiment
17 pages, 11 figures, revised treatment of FSR uncertainty, version to appear on Physics Letters B
Scientific paper
10.1016/j.physletb.2011.04.055
We have measured the cross section of the radiative process e+e- -> pi+pi-gamma with the KLOE detector at the Frascati phi-factory DAPHNE, 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 |F_pi|^2 and the dipion contribution to the muon magnetic moment anomaly, Delta a_mu^{pipi} = (478.5+-2.0_{stat}+-5.0_{syst}+-4.5_{th}) x 10^{-10} in the range 0.1 < M_{pipi}^2 < 0.85 GeV^2, where the theoretical error includes a SU(3) ChPT estimate of the uncertainty on photon radiation from the final pions. The discrepancy between the Standard Model evaluation of a_mu and the value measured by the Muon g-2 collaboration at BNL is confirmed.
Ambrosino F.
Archilli Flavio
Beltrame Paolo
Bencivenni G.
Bini Cesare
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