scholarly journals Model for the twist-3 wave function of the pion and its contribution to the pion form factor

2004 ◽  
Vol 70 (9) ◽  
Author(s):  
Tao Huang ◽  
Xing-Gang Wu
Keyword(s):  
Wave Function ◽  
Form Factor ◽  
Pion Form Factor

scholarly journals Joint Resummation for TMD Wave Function of Pion

2015 ◽  
Vol 37 ◽  
pp. 1560049 ◽  
Author(s):  
Yu-Ming Wang
Keyword(s):  
Wave Function ◽  
Form Factor ◽  
Pion Form Factor ◽  
Coefficient Function ◽  
Gluon Emission ◽  
Transverse Momentum Dependent ◽  
Pion Wave Function ◽  
Factorization Formula ◽  
Distance Coefficient ◽  
Double Logarithm

QCD corrections to transverse-momentum-dependent pion wave function develop the mixed double logarithm [Formula: see text], when the gluon emission is collinear to the energetic pion. The fist scheme-independent kT factorization formula for γ*π → γ transition form factor is achieved by resumming all the enhanced logarithms for both pion wave function and short-distance coefficient function. High-order QCD corrections and transfer momentum [Formula: see text] dependence of pion form factor are found to be distinct from those predicted by the conventional resummation approach.

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

scholarly journals POSITRONIUM DECAY: GAUGE INVARIANCE AND ANALYTICITY

2002 ◽  
Vol 17 (10) ◽  
pp. 1355-1398 ◽  
Author(s):  
J. PESTIEAU ◽  
C. SMITH ◽  
S. TRINE
Keyword(s):  
Wave Function ◽  
Form Factor ◽  
Binding Energy ◽  
Gauge Invariance ◽  
Dispersion Relations ◽  
Decay Rates ◽  
Effective Form ◽  
Theoretical Predictions ◽  
Positronium Decay ◽  
Analysis Of Binding Energy

The construction of positronium decay amplitudes is handled through the use of dispersion relations. In this way, emphasis is put on basic QED principles: gauge invariance and soft-photon limits (analyticity).A firm grounding is given to the factorization approaches, and some ambiguities in the spin and energy structures of the positronium wave function are removed. Nonfactorizable amplitudes are naturally introduced. Their dynamics are described, especially regarding the enforcement of gauge invariance and analyticity through delicate interferences. The important question of the completeness of the present theoretical predictions for the decay rates is then addressed. Indeed, some of those nonfactorizable contributions are unaccounted for by NRQED analyses. However, it is shown that such new contributions are highly suppressed, being of [Formula: see text].Finally, a particular effective form factor formalism is constructed for parapositronium, allowing a thorough analysis of binding energy effects and analyticity implementation.

scholarly journals Analysis of rho-omega interference in the pion form-factor

1996 ◽  
Vol 376 (1-3) ◽  
pp. 19-24 ◽  
Author(s):  
Kim Maltman ◽  
H.B. O'Connell ◽  
A.G. Williams
Keyword(s):  
Form Factor ◽  
Pion Form Factor

A conformal-mapping evaluation of the pion form factor in the spacelike region

1976 ◽  
Vol 15 (16) ◽  
pp. 579-582
Author(s):  
A. R. Choudary ◽  
B. H. Kellett ◽  
C. Verzegnassi
Keyword(s):  
Form Factor ◽  
Conformal Mapping ◽  
Pion Form Factor
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