Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-09-12
EPJ C72, 1917 (2012)
Physics
High Energy Physics
High Energy Physics - Phenomenology
2-column style; matches the revision accepted by EPJC
Scientific paper
10.1140/epjc/s10052-012-1917-1
A possibility of KLOE-2 experiment to measure the width Gamma(pi0 to gamma gamma) and the (pi0 gamma gamma*) form factor F(Q^2) at low invariant masses of the virtual photon in the space-like region is considered. This measurement is an important test of the strong interaction dynamics at low energies. The feasibility is estimated on the basis of a Monte-Carlo simulation. The expected accuracy for Gamma(pi0 to gamma gamma) is at a per cent level, which is better than the current experimental world average and theory. The form factor will be measured for the first time at Q^2 less or equal 0.1 GeV^2 in the space-like region. The impact of these measurements on the accuracy of the pion-exchange contribution to the hadronic light-by-light scattering part of the anomalous magnetic moment of the muon is also discussed.
Babusci Danilo
Czyz Henryk
Gonnella F.
Ivashyn Sergiy
KLOE-2 Collaboration
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