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Titolo:
On high Q(2) behavior of the pion form factor for transitions gamma*gamma -> pi(0) and gamma*gamma* -> pi(0) within the nonlocal quark-pion model
Autore:
Anikin, IV; Dorokhov, AE; Tomio, L;
Indirizzi:
Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980, Russia Joint Inst Nucl Res Dubna Russia 141980 eoret Phys, Dubna 141980, Russia UNESP, Inst Fis Teor, BR-01405900 Sao Paulo, Brazil UNESP Sao Paulo Brazil BR-01405900 BCTeor, BR-01405900 Sao Paulo, Brazil
Titolo Testata:
PHYSICS LETTERS B
fascicolo: 3-4, volume: 475, anno: 2000,
pagine: 361 - 371
SICI:
0370-2693(20000302)475:3-4<361:OHQBOT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
QCD SUM-RULES; EXCLUSIVE PROCESSES; QUANTUM CHROMODYNAMICS; TRANSVERSE-MOMENTUM; PERTURBATIVE QCD; WAVE-FUNCTION; MESON; GAMMA-STAR-GAMMA-STAR->PI-0; VIRTUALITIES; SCATTERING;
Keywords:
nonperturbative calculations; pion form factors; nonlocal theories and models;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Anikin, IV Joint Inst Nucl Res, Bogoliubov Lab Theoret Phys, Dubna 141980,Russia Joint Inst Nucl Res Dubna Russia 141980 Dubna 141980, Russia
Citazione:
I.V. Anikin et al., "On high Q(2) behavior of the pion form factor for transitions gamma*gamma -> pi(0) and gamma*gamma* -> pi(0) within the nonlocal quark-pion model", PHYS LETT B, 475(3-4), 2000, pp. 361-371

Abstract

The behavior of the transition pion form factor for processes gamma (*)gamma --> pi(0) and gamma (*)gamma (*) --> pi(0) at large values of space-likephoton momenta is estimated within the nonlocal covariant quark-pion model. It is shown that, in general, the coefficient of the leading asymptotic term depends dynamically on the ratio of the constituent quark mass and the average virtuality of quarks in the vacuum and kinematically on the ratio of photon virtualities. The kinematic dependence of the transition form factor allows us to obtain the relation between the pion light-cone distribution amplitude and the quark-pion vertex function. The dynamic dependence indicates that the transition form factor gamma (*)gamma -->, pi(0) at high momentum transfers is very sensitive to the nonlocality size of nonperturbative fluctuations in the QCD vacuum. (C) 2000 Elsevier Science B.V. All rightsreserved.

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Documento generato il 28/03/20 alle ore 23:07:55