Naslov
Two-photon decays of pi^0, eta_c and eta_b in a Bethe-Salpeter approach
(Two-photon decays of $pi^0, eta_c$ and $ eta_b$ in a Bethe-Salpeter approach)

Autori
Kekez, Dalibor ; Klabučar, Dubravko

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the International Conference HADRON STRUCTURE "96 / Lubomir Martinovič i Pavol Striženec - Bratislava : Institute of Physics of Slovakian Academy of Sciences, 1996, 166-171

Skup
International Conference HADRON STRUCTURE "96

Mjesto i datum
Stará Lesná, Slovačka, 12.02.1996. - 16.02.1996

Vrsta sudjelovanja
Pozvano predavanje

Vrsta recenzije
Nije recenziran

Ključne riječi
hadronic structure; QCD; Schwinger-Dyson equations; Bethe-Salpeter equations; electromagnetic; axial anomaly

Sažetak
We calculate the widths for the decays of $pi^0, eta_c$ and $eta_b$ into two photons. We treat $pi^0, eta_c$ and $eta_b$ as the $qar{q}$ bound states in the Bethe--Salpeter formalism, incorporating the dynamical chiral symmetry breaking and the (pseudo) Goldstone nature of the pion. We use the dressed, Ball--Chiu electromagnetic quark vertices, consistent with our dressed quark propagators. This enables us to incorporate the Abelian axial anomaly correctly in our Bethe--Salpeter approach, as demonstrated by its ability to give analytically, in the chiral limit, the famous axial anomaly result for the $pi^0 ogammagamma$ decay. The same framework is also capable of describing systems of heavy quarks, concretely $eta_c$ and possibly $eta_b$, and their $gammagamma$ decays.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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