ON THE PROBLEM OF THE TAU[-PI-O-GAMMA-GAMMA DECAY IN CHIRAL PERTURBATION-THEORY AT THE QUARK LEVEL

Authors
IVANOV AN TROITSKAYA NI NAGY M
Citation
An. Ivanov et al., ON THE PROBLEM OF THE TAU[-PI-O-GAMMA-GAMMA DECAY IN CHIRAL PERTURBATION-THEORY AT THE QUARK LEVEL, Nuovo cimento della Società Italiana di Fisica. A. Nuclei, particles and fields, 107(8), 1994, pp. 1375-1382
Citations number
18
Categorie Soggetti
Physics, Particles & Fields
Journal title
Nuovo cimento della Società Italiana di Fisica. A. Nuclei, particles and fields → ACNP
ISSN journal
11241861
Volume
107
Issue
8
Year of publication
1994
Pages
1375 - 1382
Database
ISI
SICI code
1124-1861(1994)107:8<1375:OTPOTT>2.0.ZU;2-F
Abstract
The partial width of the decay eta --> pi0 gammagamma is calculated wi thin the chiral perturbation theory at quark level [(CHPT)q] exploitin g the linear realization of chiral U(3) x U(3) symmetry: GAMMA(eta --> pi0 gammagamma)(CHPT)q = (0.24 +/- 0.05) eV. The result is not compar ed with the experimental one GAMMA(eta --> pi0 gammagamma)exp = (0.85 +/- 0.19) eV. It is confirmed that despite the essential progress of t he experimental research of the decay eta --> pi0 gammagamma the neces sity of the remeasuring of GAMMA(eta --> pi0 gammagamma), said out by Ebert and Volkov in 1979, is still valid.