Evidence that the a_0(980) and f_0(980) are not elementary particles

Baru, V.; Kalashnikov, Yu.; Hanhart, C.; Haidenbauer, J.; Kudryavtsev, A.

doi:10.1016/j.physletb.2004.01.088

Journal Article

Evidence that the a_0(980) and f_0(980) are not elementary particles

Baru, V.FZJ* ; Haidenbauer, J.FZJ* ; Hanhart, C.FZJ* ; Kalashnikov, Y.FZJ* ; Kudryavtsev, A.FZJ*

2004
North-Holland Publ. Amsterdam

Physics letters / B 586, 53 - 61 (2004) [10.1016/j.physletb.2004.01.088]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10692 doi:10.1016/j.physletb.2004.01.088

Abstract: We study the interesting problem of whether it is possible to distinguish composite from elementary particles. In particular we generalize a model-independent approach of Weinberg to the case of unstable particles. This allows us to apply our formalism to the case of the a(0)(980) and f(0)(980) resonances and to address the question whether these particles are predominantly genuine, confined quark states (of (q) over barq or qq (q) over bar(q) over bar structure) or governed by mesonic components. (C) 2004 Elsevier B.V. All rights reserved.

Keyword(s): meson: hadron spectroscopy ; meson: model ; a0(980) ; f0(980) ; meson: wave function ; coupled channel ; renormalization ; K anti-K: scattering amplitude ; f0(980): hadronic decay ; a0(980): hadronic decay ; pseudoscalar meson: pair production ; quark antiquark: bound state ; bound state: (2quark 2antiquark) ; K anti-K: bound state ; numerical calculations: interpretation of experiments ; f0(980) --> 2pi ; a0(980) --> eta pi