scholarly journals Pion-photon transition form factor in light cone sum rules and tests of asymptotics

2020 ◽  
Vol 102 (3) ◽  
Author(s):  
N. G. Stefanis
Keyword(s):  
Form Factor ◽  
Light Cone ◽  
Transition Form Factor ◽  
Sum Rules ◽  
Transition Form ◽  
Photon Transition

scholarly journals Pion-photon transition form factor in light-cone sum rules

2012 ◽  
Author(s):  
A. V. Pimikov ◽  
A. P. Bakulev ◽  
S. V. Mikhailov ◽  
N. G. Stefanis
Keyword(s):  
Form Factor ◽  
Light Cone ◽  
Transition Form Factor ◽  
Sum Rules ◽  
Transition Form ◽  
Photon Transition

scholarly journals PION TRANSITION FORM FACTOR AT THE TWO-LOOP LEVEL VIS-À-VIS EXPERIMENTAL DATA

2009 ◽  
Vol 24 (35n37) ◽  
pp. 2858-2867 ◽  
Author(s):  
S. V. MIKHAILOV ◽  
N. G. STEFANIS
Keyword(s):  
Experimental Data ◽  
Perturbation Theory ◽  
Form Factor ◽  
Light Cone ◽  
Transition Form Factor ◽  
Sum Rules ◽  
Leading Order ◽  
Transition Form ◽  
Qcd Sum Rules ◽  
Theoretical Results

We use light-cone QCD sum rules to calculate the pion-photon transition form factor, taking into account radiative corrections up to the next-to-next-to-leading order of perturbation theory. We compare the obtained predictions with all available experimental data from the CELLO, CLEO, and the BaBar Collaborations. We point out that the BaBar data are incompatible with the convolution scheme of QCD, on which our predictions are based, and can possibly be explained only with a violation of the factorization theorem. We pull together recent theoretical results and comment on their significance.

scholarly journals Matching lightcone and anomaly-sum-rule predictions for the pion-photon transition form factor

2016 ◽  
Vol 93 (5) ◽  
Author(s):  
A. G. Oganesian ◽  
A. V. Pimikov ◽  
N. G. Stefanis ◽  
O. V. Teryaev
Keyword(s):  
Form Factor ◽  
Transition Form Factor ◽  
Transition Form ◽  
Sum Rule ◽  
Photon Transition

scholarly journals Pion-photon transition form factor and new physics in theτsector

2012 ◽  
Vol 85 (5) ◽  
Author(s):  
David McKeen ◽  
Maxim Pospelov ◽  
J. Michael Roney
Keyword(s):  
Form Factor ◽  
Transition Form Factor ◽  
New Physics ◽  
Transition Form ◽  
Photon Transition

THE FORM FACTOR OF ργ*→π0IN THE FINITE-WIDTH LIGHT-CONE LOCAL DUALITY SUM RULE

2012 ◽  
Vol 21 (04) ◽  
pp. 1250048
Author(s):  
MINGHAI LI ◽  
JUEPING LIU
Keyword(s):  
Form Factor ◽  
Light Cone ◽  
Asymptotic Form ◽  
Sum Rules ◽  
Absorptive Part ◽  
Finite Width ◽  
Transition Form ◽  
Sum Rule ◽  
Local Duality ◽  
The Difference

The form factor of the transition ργ*→π0is investigated by analyzing the γγ*→π0transition in the framework of the light-cone local duality quantum chromodynamics sum rules. Both finite- and zero-width forms for the low-energy physical absorptive part of the γγ*→π0transition are considered. The numerical results for the transition form factor Fρπ(Q2) in the asymptotic form and the CZ one of the pion distribution amplitude are obtained respectively, the difference between the finite- and zero-width form is not big but still distinguishable. It is found that the results for the form factor Fρπ(Q2) from CZ, asymptotic and the flat pion DAs are compatible with the predictions of perturbative QCD. Our results will be helpful to distinguish the shape of the pion DA of twist-two, when the concrete information of the experimental data for the transition ργ*→π0are provided.

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