Spectral functions of scalar mesons
- Institut fuer Theoretische Physik, Universitaet Frankfurt, Johann Wolfgang Goethe Universitaet, Max von Laue Str. 1, D-60438 Frankfurt (Germany)
In this work we study the spectral functions of scalar mesons in one- and two-channel cases by using nonlocal interaction Lagrangian(s). When the propagators satisfy the Kaellen-Lehman representation, a normalized spectral function is obtained, allowing one to take into account finite-width effects in the evaluation of decay rates. In the one-channel case, suitable to the light {sigma} and k mesons, the spectral function can deviate consistently from a Breit-Wigner shape. In the two-channel case with one subthreshold channel, the evaluated spectral function is well approximated by a Flatte distribution; when applying the study to the a{sub 0}(980) and f{sub 0}(980) mesons, the tree-level forbidden KK decay is analyzed.
- OSTI ID:
- 21068002
- Journal Information:
- Physical Review. C, Nuclear Physics, Vol. 76, Issue 6; Other Information: DOI: 10.1103/PhysRevC.76.065204; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2813
- Country of Publication:
- United States
- Language:
- English
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