Universal behavior of the γ⁎γ→(π0, [eta], [eta]′) transition form factors
The photon transition form factors of π, η and η′ are discussed in view of recent measurements. It is shown that the exact axial anomaly sum rule allows a precise comparison of all three form factors at high-Q2 independent of the different structures and distribution amplitudes of the participating...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
5 December 2012
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| In: |
Physics letters
Year: 2012, Volume: 718, Issue: 2, Pages: 488-491 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2012.10.052 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1016/j.physletb.2012.10.052 Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0370269312011069 
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| Author Notes: | Dmitri Melikhov, Berthold Stech |
| Summary: | The photon transition form factors of π, η and η′ are discussed in view of recent measurements. It is shown that the exact axial anomaly sum rule allows a precise comparison of all three form factors at high-Q2 independent of the different structures and distribution amplitudes of the participating pseudoscalar mesons. We conclude: (i) The πγ form factor reported by Belle is in excellent agreement with the nonstrange I=0 component of the η and η′ form factors obtained from the BaBar measurements. (ii) Within errors, the πγ form factor from Belle is compatible with the asymptotic pQCD behavior, similar to the η and η′ form factors from BaBar. Still, the best fits to the data sets of πγ, ηγ, and η′γ form factors favor a universal small logarithmic rise Q2FPγ(Q2)∼log(Q2). |
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| Item Description: | Gesehen am 22.11.2018 |
| Physical Description: | Online Resource |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2012.10.052 |