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The axial anomaly and consistency of the finite-width light-cone local duality sum rule for the form factor of the transition gamma(*)gamma(*) -> pi(0)
Li, Minghai; Guo, Ze-Kun; Liu, Jueping
2013
Source PublicationJOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS
ISSN0954-3899
Volume40Issue:3
AbstractThe pion transition form factor F-gamma*pi (q(1)(2), q(2)(2)) at the photon mass-shell of q(1)(2) = q(2)(2) = 0 is fixed by the axial anomaly, which may serve as a criterion in checking the consistency of the underlying quantum chromodynamics (QCD). We choose to work in the symmetric kinematical region where two photons have the same virtualities and hope to reproduce the experimental value of F-gamma*pi (q(1)(2) = 0, q(2)(2) = 0) from light-cone QCD sum rules instead of direct extrapolation of the QCD expression to such a low-energy scale. The form factor of the transition gamma(*)gamma(*) -> pi(0) is investigated in the framework of the zero- and finite-width light-cone local duality QCD sum rules. The expression of the pion transition form factor F-QCD(gamma*pi) (q(1)(2) = t, q(2)(2) = t) at large t is independent of the twist-two and twist-three pion distribution amplitudes; therefore a more accurate conclusion may be reached. The influence of the light quark mass and the omega rho pi coupling constant to our sum rules is also considered. The consistency between the axial anomaly, the intermediate hadronic structure and the QCD perturbative dynamics is tested to be true within a reasonable region of input parameters.
Indexed BySCI
Language英语
Funding Project应物所项目组
WOS IDWOS:000314824700005
Citation statistics
Document Type期刊论文
Identifierhttp://ir.sinap.ac.cn/handle/331007/13950
Collection中科院上海应用物理研究所2011-2019年
Recommended Citation
GB/T 7714
Li, Minghai,Guo, Ze-Kun,Liu, Jueping. The axial anomaly and consistency of the finite-width light-cone local duality sum rule for the form factor of the transition gamma(*)gamma(*) -> pi(0)[J]. JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,2013,40(3).
APA Li, Minghai,Guo, Ze-Kun,&Liu, Jueping.(2013).The axial anomaly and consistency of the finite-width light-cone local duality sum rule for the form factor of the transition gamma(*)gamma(*) -> pi(0).JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS,40(3).
MLA Li, Minghai,et al."The axial anomaly and consistency of the finite-width light-cone local duality sum rule for the form factor of the transition gamma(*)gamma(*) -> pi(0)".JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS 40.3(2013).
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