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@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.
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