Vector meson dominance and the pi0 transition form factor
- NázevTitle
- Vector meson dominance and the pi0 transition form factorVector meson dominance and the pi0 transition form factor
- Druh výsledkuResult type
- Článek v časopiseJournal article
- AutořiAuthors
- P. Lichard
- Klíčová slovaKeywords
- Vector-meson dominance, Decays of pi mesons, Electromagnetic form factors, Light mesons
- DOIDOI
- 10.1103/PhysRevD.83.037503
- Časopis / citaceJournal / citation
- Physical Review D 83(3), 037503 (2011) · ISSN 1550-7998
- RokYear
- 2011
- JazykLanguage
- eng
- ZáznamyRecords
- ProjektProject
- Centrum experimentální jaderné astrofyziky a jaderné fyzikyCenter of Experimental Nuclear Astrophysics and Nuclear Physics; Fundamentální experimenty ve fyzice mikrosvětaFundamental Experiments in Physics of Microworld
- CitovánoCited by
- 26 (INSPIRE-HEP)
- Plný text (open access)Full text (open access)
- https://arxiv.org/pdf/1012.5634
- Citace ke staženíDownload citation
- TXT · BibTeX
AbstraktAbstract
It is shown that the pi0 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 (approx 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 (VMD) 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 pi0 -> 2 gamma decay rate, and in the pi0 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.
It is shown that the pi0 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 (approx 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 (VMD) 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 pi0 -> 2 gamma decay rate, and in the pi0 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.