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Quark-gluonium content of the scalar-isoscalar states f_0(980), f_0(1300), f_0(1500), f_0(1750), f_0(1420 ^{+150}_{- 70}) from hadronic decays | | V. V. Anisovich
; V. A. Nikonov
; A. V. Sarantsev
; | | Date: |
23 Aug 2001 | | Journal: | Phys.Atom.Nucl. 66 (2003) 741-754; Yad.Fiz. 66 (2003) 772-785 | | Subject: | hep-ph | | Abstract: | On the basis of the decay couplings f_0 -> pipi, Kar K, etaeta, etaeta’, which had been found before, in the study of analytical (IJ^{PC}=00^{++})-amplitude in the mass range 450-1900 MeV, we analyse the quark-gluonium content of resonances f_0(980), f_0(1300), f_0(1500), f_0(1750) and the broad state f_0(1420 ^{+ 150}_{-70}). The K-matrix technique used in the analysis makes it possible to evaluate the quark-gluonium content both for the states with switched-off decay channels (bare states, f^{bare}_0) and the real resonances. We observe significant change of the quark-gluonium composition in the evolution from bare states to real resonances, that is due to the mixing of states in the transitions f_0(m_1)-> real mesons-> f_0(m_2) responsible for the decay processes as well. For the f_0(980), the analysis confirmed the dominance of qar q component thus proving the nar n/sar s composition found in the study of the radiative decays. For the mesons f_0(1300), f_0(1500) and f_0(1750), the hadronic decays do not allow one to determine uniquely the nar n, sar s and gluonium components providing relative pecentage only. The analysis shows that the broad state f_0(1420 ^{+ 150}_{-70}) can mix with the flavour singlet qar q component only, that is consistent with gluonium origin of the broad resonance. | | Source: | arXiv, hep-ph/0108188 | | Services: | Forum | Review | PDF | Favorites | |
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