Speaker
Description
We investigate (π0, η, η0) → γ∗γ transition form factors (TFFs) for both
space- and timelike regions using the light-front quark model. For the low
energy regime, we compare our LFQM results of the TFFs for low timelike
momentum transfer region and the slope parameters at q2 = 0 with the
recent experimental data from the Dalize decays of (π0, η, η0). For the high
energy regime, we show the asymptotic behavior of TFFs for both space-
and time-like regions and compare them with the available experimental
data. Especially, we develop the new direct method to explore the timelike
region without resorting to mere analytic continuation from space- to time-
like region. Our direct calculation in timelike region shows the complete
agreement with not only the analytic continuation result from spacelike region but also the result from the dispersion relation between the real and
imaginary parts of the form factor.
