scholarly journals Pion form factor at spacelike momentum transfers from local-duality QCD sum rule

2008 ◽  
Vol 661 (5) ◽  
pp. 354-359 ◽  
Author(s):  
Victor Braguta ◽  
Wolfgang Lucha ◽  
Dmitri Melikhov
Keyword(s):  
Form Factor ◽  
Pion Form Factor ◽  
Sum Rule ◽  
Local Duality

scholarly journals PION FORM FACTOR IN QCD SUM RULES WITH NONLOCAL CONDENSATES AND IN THE LOCAL-DUALITY APPROACH

2009 ◽  
Vol 24 (35n37) ◽  
pp. 2848-2857 ◽  
Author(s):  
A. P. BAKULEV ◽  
A. V. PIMIKOV ◽  
N. G. STEFANIS
Keyword(s):  
Form Factor ◽  
Sum Rules ◽  
Pion Form Factor ◽  
Analytic Perturbation Theory ◽  
Continuum Threshold ◽  
Sum Rule ◽  
Local Duality ◽  
Rule Approach ◽  
Duality Approach ◽  
The Continuum

We discuss the QCD sum-rule approach for the spacelike electromagnetic pion form factor in the O(αs) approximation. We show that the nonlocality of the condensates is a key point to include nonperturbative contributions to the pion form factor. We compare our results with the Local-Duality predictions and show that the continuum threshold s0(Q2) parameter is highly underestimated in the Local-Duality approach at Q2 ≳ 2 GeV 2. Using our fit for this parameter, [Formula: see text] and applying the fractional analytic perturbation theory, we estimate with an accuracy of the order of 1% the [Formula: see text] contribution to the pion's form factor.

scholarly journals Local-duality QCD sum rule for the pion elastic form factor

2011 ◽  
Author(s):  
Irina Balakireva ◽  
Wolfgang Lucha ◽  
Dmitri Melikhov
Keyword(s):  
Form Factor ◽  
Elastic Form Factor ◽  
Sum Rule ◽  
Local Duality ◽  
Elastic Form

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.

Optimal information for the pion form factor from analyticity and experimental data

1973 ◽  
Vol 63 ◽  
pp. 285-300 ◽  
Author(s):  
G. Nenciu ◽  
I. Raszillier ◽  
W. Schmidt ◽  
H. Schneider
Keyword(s):  
Experimental Data ◽  
Form Factor ◽  
Pion Form Factor ◽  
Optimal Information

scholarly journals The pion form factor in improved lattice QCD

2003 ◽  
Vol 566 (1-2) ◽  
pp. 131-136 ◽  
Author(s):  
J. van der Heide ◽  
M. Lutterot ◽  
J.H. Koch ◽  
E. Laermann
Keyword(s):  
Form Factor ◽  
Lattice Qcd ◽  
Pion Form Factor
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