Naslov
Schwinger-Dyson approach, gluon condensates and phenomenology of eta-eta' complex, invited talk to NAPP 2003
(Schwinger-Dyson approach, gluon condensates and phenomenology of eta-eta' complex)

Autori
Klabučar, Dubravko ; Kekez, Dalibor

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, neobjavljeni rad, znanstveni

Skup
Second International Conference on NUCLEAR AND PARTICLE PHYSICS with CEBAF at Jefferson Laboratory (NAPP 2003)

Mjesto i datum
Dubrovnik, Hrvatska, 26.05.2003. - 31.05.2003

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
hadron; quark; gluon; Dyson-Schwinger equations; QCD

Sažetak
The Schwinger-Dyson approach to hadron phenomenology requires a rather strong enhancement (at intermediate spacelike momenta of the order Q2 ~ 0.5 GeV2) of the "infrared part" of the quark-gluon interaction. So far, such phenomenologically successful enahnced part has to be modeled, since it has been difficult to explain theoretically. A mechanism based on gluon condensates may provide an essential contribution to the effective quark-gluon interaction, since we have strong evidence that this leads to an enhancement which gives sufficiently strong dynamical chiral symmetry breaking, crucial for describing the light pseudoscalar mesons. This has been shown in the nonstrange sector by obtaining good values of dynamically generated quark mass, chiral quark condensate, pion decay constant and pion mass, as well as satisfying Gell-Mann-Oakes-Renner relation. We can demonstrate the extension thereof into the strange sector, which enables a good description not only of kaons, but of the eta-eta' complex as well.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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