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On the problem of the η→π0γγ decay in chiral perturbation theory at the quark level

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Il Nuovo Cimento A (1965-1970)

Summary

The partial width of the decay η→π0γγ is calculated within the chiral perturbation theory at quark level [(CHPT)q] exploiting the linear realization of chiralU(3)×U(3) symmetry: Г(η→π0γγ)(CHPT)q=(0.24±0.05) eV. The result is not compared with the experimental one Г(η→π0γγ)(CHPT)exp=(0.85±0.19) eV. It is confirmed that despite the essential progress of the experimental research of the decay η→π0γγ the necessity of the remeasuring of Г(η→π0γγ), said out by Ebert and Volkov in 1979, is still valid.

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Authors and Affiliations

  1. State Technical University, 195251, St. Petersburg, Russia

    A. N. Ivanov & N. I. Troitskaya

  2. Institute of Physics, SSlovak Academy of Sciences, 84228, Bratislava, Slovakia

    M. Nagy

Authors
  1. A. N. Ivanov
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  2. N. I. Troitskaya
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  3. M. Nagy
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Ivanov, A.N., Troitskaya, N.I. & Nagy, M. On the problem of the η→π0γγ decay in chiral perturbation theory at the quark level. Nuov Cim A 107, 1375–1382 (1994). https://doi.org/10.1007/BF02775777

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  • DOI: https://doi.org/10.1007/BF02775777

PACS 12.90

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