  The pion-photon transition form factor is studied by employing two types of
Sum Rules: Light Cone Sum Rules (LCSR) and Anomaly Sum Rules (ASR). By
comparing the predictions for the pion-photon transition form factor, obtained
from these two approaches, the applicability limit of the LCSRs at low momenta
is determined. Reciprocally, the ASR threshold dependence on the momentum was
extracted using our LCSR-based method in combination with two different types
of pion distribution amplitudes and found that at higher Q2 it approaches a
constant.
