Vector meson dominance and the pi(0) transition form factor

@article{43252,
   author = {Lichard, Peter},
   article_location = {US - Spojené státy americké},
   article_number = {3},
   doi = {http://dx.doi.org/10.1103/PhysRevD.83.037503},
   keywords = {vector meson;transition form factor},
   language = {eng},
   issn = {1550-7998},
   journal = {Physical Review D},
   title = {Vector meson dominance and the pi(0) transition form factor},
   url = {http://journals.aps.org/prd/abstract/10.1103/PhysRevD.83.037503},
   volume = {83},
   year = {2011}
}

TY  - JOUR
ID  - 43252
AU  - Lichard, Peter
PY  - 2011
TI  - Vector meson dominance and the pi(0) transition form factor
JF  - Physical Review D
VL  - 83
IS  - 3
SP  - '037503-1'-'037503-4'
EP  - '037503-1'-'037503-4'
SN  - 15507998
KW  - vector meson;transition form factor
UR  - http://journals.aps.org/prd/abstract/10.1103/PhysRevD.83.037503
N2  - It is shown that the $pi^0$ transition form factor $F(Q_1^2, Q_2^2)$ differs substantially from its one-real-photon limit $F(Q_1^2, 0)$ even for rather small values of $Q_2^2 approximate to 0.1 GeV^2$, which cannot be excluded in experiments with one "untagged" electron. It indicates that the comparison of data with theoretical calculations, which usually assume $Q_2^2 = 0$, may be untrustworthy. Our phenomenological model of the $pi^0$ transition form factor is based on the vector-meson-dominance hypothesis and all its parameters are fixed by using the experimental data on the decays of vector mesons. The model soundness is checked in the two-real-photon limit, where it provides a good parameter-free description of the $pi^0 -> 2 gamma$ decay rate, and in the $pi_0$ Dalitz decay. The dependence of $F(Q_1^2, Q_2^2)$ on $Q_1^2$ at several fixed values of $Q_2^2$ is presented and the comparison with existing data performed.
ER  - 

LICHARD, Peter. Vector meson dominance and the pi(0) transition form factor. \textit{Physical Review D}. US - Spojené státy americké, 2011, roč.~83, č.~3, s.~'037503-1'-'037503-4', 4 s. ISSN~1550-7998. Dostupné z: https://dx.doi.org/10.1103/PhysRevD.83.037503.