Systematic estimation of theoretical uncertainties in the calculation of the pion-photon transition form factor using light-cone sum rules

被引：34

作者：

Mikhailov, S. V. ^{[1
]}

Pimikov, A. V. ^{[1
,2
]}

Stefanis, N. G. ^{[3
]}

机构：

[1] JINR, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia

[2] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China

[3] Ruhr Univ Bochum, Inst Theoret Phys 2, Univ Str 150, D-44780 Bochum, Germany

来源：

PHYSICAL REVIEW D | 2016年 / 93卷 / 11期

基金：

中国国家自然科学基金; 俄罗斯基础研究基金会;

关键词：

EVOLUTION KERNELS; WAVE-FUNCTION; QCD;

D O I：

10.1103/PhysRevD.93.114018

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We consider the calculation of the pion-photon transition form factor F-gamma*(gamma pi 0)(Q(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-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-gamma*(gamma pi 0)(Q(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(2) range between 1 and 5 GeV2, 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.

引用

页数：14

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