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Mikhailov, S. V.; Pimikov, A. V.; Stefanis, N. G.
Physical review. D, 06/2016, Letnik: 93, Številka: 11Journal Article
We consider the calculation of the pion-photon transition form factor F super(gamma*gammapi0)(Q super(2)) within light-cone sum rules focusing attention to the low-mid region of momenta. The central aim is to estimate the theoretical uncertainties which originate from a wide variety of sources related to (i) the relevance of next-to-next-to-leading order radiative corrections (ii) the influence of the twist-four and the twist-six term (iii) the sensitivity of the results on auxiliary parameters, like the Borel scale M super(2), (iv) the role of the phenomenological description of resonances, and (v) the significance of a small but finite virtuality of the quasireal photon. Predictions for F super(gamma*gammapi0)(Q super(2)) are presented which include all these uncertainties and found to comply within the margin of experimental error with the existing data in the Q super(2) range between 1 and 5GeV super(2), thus justifying the reliability of the applied calculational scheme. This provides a solid basis for confronting theoretical predictions with forthcoming data bearing small statistical errors.
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