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Form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.

Authors :
Melikhov, D.
Volobuev, I.
Ayala, C.
Mikhailov, S. V.
Pimikov, A. V.
Stefanis, N. G.
Source :
EPJ Web of Conferences; 11/19/2019, Vol. 222, p1-8, 8p
Publication Year :
2019

Abstract

We consider the lightcone sum-rule (LCSR) description of the pionphoton transition form factor in combination with the renormalization group of QCD. The emerging scheme represents a certain version of Fractional Analytic Perturbation Theory and significantly extends the applicability domain of perturbation theory towards lower momenta Q<superscript>2</superscript> ≲ 1 GeV<superscript>2</superscript>. We show that the predictions calculated herewith agree very well with the released preliminary data of the BESIII experiment, which have very small errors just in this region, while the agreement with other data at higher Q<superscript>2</superscript> is compatible with the LCSR predictions obtained recently by one of us using fixed-order perturbation theory. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
21016275
Volume :
222
Database :
Complementary Index
Journal :
EPJ Web of Conferences
Publication Type :
Conference
Accession number :
140234599
Full Text :
https://doi.org/10.1051/epjconf/201922203017