TY  - JOUR
AU  - Kochelev, N. I.
AU  - Vento, V.
PY  - 2010
DA  - 2010//
TI  - Gluonic components of the pion and the transition form factor gamma*gamma* -> pi(0)
T2  - Phys. Rev. D
JO  - Physical Review D
SP  - 034009
EP  - 5pp
VL  - 81
IS  - 3
PB  - Amer Physical Soc
AB  - We propose an effective Lagrangian for the coupling of the neutral pion with gluons whose strength is determined by a low-energy theorem. We calculate the contribution of the gluonic components arising from this interaction to the pion transition form factor gamma*gamma* -> pi(0) using the instanton liquid model to describe the quantum chromodynamics vacuum. We find that this contribution is large and might explain the anomalous behavior of the form factor at large virtuality of one of the photons, a feature which was recently discovered by the BABAR Collaboration.
SN  - 1550-7998
UR  - http://arxiv.org/abs/0912.2172
UR  - https://doi.org/10.1103/PhysRevD.81.034009
DO  - 10.1103/PhysRevD.81.034009
LA  - English
N1  - ISI:000275069000030
ID  - Kochelev+Vento2010
ER  -