LICHARD, Peter. Vector meson dominance and the pi(0) transition form factor. Physical Review D. US - Spojené státy americké, 2011, vol. 83, No 3, p. '037503-1'-'037503-4', 4 pp. ISSN 1550-7998. Available from: https://dx.doi.org/10.1103/PhysRevD.83.037503.
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Basic information
Original name Vector meson dominance and the pi(0) transition form factor
Authors LICHARD, Peter.
Edition Physical Review D, US - Spojené státy americké, 2011, 1550-7998.
Other information
Original language English
Type of outcome Article in a journal
Confidentiality degree is not subject to a state or trade secret
WWW www
Organization unit Faculty of Philosophy and Science in Opava
Doi http://dx.doi.org/10.1103/PhysRevD.83.037503
UT WoS 000287368900010
Keywords in English vector meson;transition form factor
Tags UF
Tags International impact, Reviewed
Links LC07050, research and development project.
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 10/12/2020 08:43.
Abstract
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.
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