1109.2461 (D. Babusci et al.)

On the possibility to measure the (pi0 to gamma gamma) decay width and
the (gamma* gamma to pi0) transition form factor with the KLOE-2 experiment    [PDF]

D. Babusci, H. Czyz, F. Gonnella, S. Ivashyn, M. Mascolo, R. Messi, D. Moricciani, A. Nyffeler, G. Venanzoni, KLOE-2 Collaboration

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.

View original: http://arxiv.org/abs/1109.2461