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

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

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 pertu...

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Main Authors: Ayala C., Mikhailov S. V., Pimikov A. V., Stefanis N. G.
Format: Article
Language:English
Published: EDP Sciences 2019-01-01
Series:EPJ Web of Conferences
Online Access:https://www.epj-conferences.org/articles/epjconf/pdf/2019/27/epjconf_qfthep2019_03017.pdf
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spelling doaj-5a28db3bf80347bd9bf75c60797a696e2021-08-02T09:35:02ZengEDP SciencesEPJ Web of Conferences2100-014X2019-01-012220301710.1051/epjconf/201922203017epjconf_qfthep2019_03017Form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.Ayala C.Mikhailov S. V.Pimikov A. V.Stefanis N. G.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 Q2 ≲ 1 GeV2. 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 Q2 is compatible with the LCSR predictions obtained recently by one of us using fixed-order perturbation theory.https://www.epj-conferences.org/articles/epjconf/pdf/2019/27/epjconf_qfthep2019_03017.pdf
collection DOAJ
language English
format Article
sources DOAJ
author Ayala C.
Mikhailov S. V.
Pimikov A. V.
Stefanis N. G.
spellingShingle Ayala C.
Mikhailov S. V.
Pimikov A. V.
Stefanis N. G.
Form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.
EPJ Web of Conferences
author_facet Ayala C.
Mikhailov S. V.
Pimikov A. V.
Stefanis N. G.
author_sort Ayala C.
title Form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.
title_short Form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.
title_full Form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.
title_fullStr Form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.
title_full_unstemmed Form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.
title_sort form factor π0γ*γ in lightcone sum rules combined with renormalization-group summation vs experimental data.
publisher EDP Sciences
series EPJ Web of Conferences
issn 2100-014X
publishDate 2019-01-01
description 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 Q2 ≲ 1 GeV2. 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 Q2 is compatible with the LCSR predictions obtained recently by one of us using fixed-order perturbation theory.
url https://www.epj-conferences.org/articles/epjconf/pdf/2019/27/epjconf_qfthep2019_03017.pdf
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AT mikhailovsv formfactorp0gginlightconesumrulescombinedwithrenormalizationgroupsummationvsexperimentaldata
AT pimikovav formfactorp0gginlightconesumrulescombinedwithrenormalizationgroupsummationvsexperimentaldata
AT stefanisng formfactorp0gginlightconesumrulescombinedwithrenormalizationgroupsummationvsexperimentaldata
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