Improved perturbative QCD analysis of the pion-photon transition form factor

1995 ◽  
Vol 52 (5) ◽  
pp. 3111-3114 ◽  
Author(s):  
Saro Ong
Keyword(s):  
Form Factor ◽  
Perturbative Qcd ◽  
Transition Form Factor ◽  
Transition Form ◽  
Photon Transition ◽  
Qcd Analysis

INFRARED RENORMALON EFFECTS ON LIGHT MESONS ELECTROMAGNETIC TRANSITION FORM FACTOR FMγ*(Q2, ω)

2003 ◽  
Vol 18 (07) ◽  
pp. 1023-1050 ◽  
Author(s):  
YEGANA V. MAMEDOVA
Keyword(s):  
Form Factor ◽  
Perturbative Qcd ◽  
Transition Form Factor ◽  
Form Factors ◽  
Transition Form ◽  
Coupling Constant ◽  
Electromagnetic Transition ◽  
Qcd Factorization ◽  
Factorization Formula ◽  
Light Mesons

The light pseudoscalar π0, η and η′ mesons electromagnetic transition γ* + γ* → M form factors FMγ*(Q2,ω) are calculated, applying the perturbative QCD factorization formula and the frozen coupling constant approximation. In the computations the O(αS) order expression for FMγ*(Q2,ω) and the mesons' infrared renormalon corrected distribution amplitudes are used. In the case of the η and η′ mesons, the SUf(3) ordinary octet-singlet mixing scheme is utilized. Comparisons are made with the results obtained, employing the mesons' ordinary distribution amplitudes and with γ + γ* → M transition form factors.

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 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 CHIRAL ANOMALY EFFECTS AND THE BABAR MEASUREMENTS OF THE γγ* → π0 TRANSITION FORM-FACTOR

2011 ◽  
Vol 26 (23) ◽  
pp. 4125-4131 ◽  
Author(s):  
T. N. PHAM ◽  
X. Y. PHAM
Keyword(s):  
Form Factor ◽  
Perturbative Qcd ◽  
Virtual Photon ◽  
Transition Form Factor ◽  
High Energy ◽  
Chiral Anomaly ◽  
Steady Increase ◽  
Transition Form ◽  
Babar Data ◽  
Energy Processes

The recent BaBar measurements of the γγ*→π0 transition form-factor show spectacular deviation from perturbative QCD prediction for large spacelike Q2 up to 34 GeV2. When plotted against Q2, Q2F(Q2) shows steady increase with Q2 in contrast with the flat Q2 behavior predicted by perturbative QCD, and at 34 GeV2 is more than 50% larger than the QCD prediction. Stimulated by the BaBar measurements, we revisit our previous paper on the cancellation of anomaly effects in high energy processes Z0→π0γ, e+e- → π0γ and apply our results to the γ*γ→π0 transition form-factor measured in the e+e- → e+e-π0 process with one highly virtual photon. We find that, the transition form-factor F(Q2) behaves as [Formula: see text] and produces a striking agreement with the BaBar data for Q2F(Q2) with m = 132 MeV which also reproduces very well the CLEO data at lower Q2.

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

scholarly journals Can we understand an auxetic pion-photon transition form factor within QCD?

2013 ◽  
Vol 87 (9) ◽  
Author(s):  
N. G. Stefanis ◽  
A. P. Bakulev ◽  
S. V. Mikhailov ◽  
A. V. Pimikov
Keyword(s):  
Form Factor ◽  
Transition Form Factor ◽  
Transition Form ◽  
Photon Transition
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