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Dynamical generation of scalar mesons.

Boglione, M. and Pennington, M. R. (2002) 'Dynamical generation of scalar mesons.', Physical review D : particles and fields., 65 . p. 114010.


Starting with just one bare seed for each member of a scalar nonet, we investigate when it is possible to generate more than one hadronic state for each set of quantum numbers. In the framework of a simple model, we find that in the I=1 sector it is possible to generate two physical states with the right features to be identified with the a0(980) and the a0(1450). In the I=1/2 sector, we can generate a number of physical states with masses higher than 1 GeV, including one with the right features to be associated with the K0*(1430). However, a light κ scalar meson cannot be generated as a conventional resonance but only as a bound state. The I=0 sector is the most complicated and elusive: since all outcomes are very strongly model dependent, we cannot draw any robust conclusion. Nevertheless, we find that in that case too, depending on the coupling scheme adopted, the occurrence of numerous states can be achieved. This shows that dynamical generation of physical states is a possible solution to the problem of accounting for more scalar mesons than can fit in a single nonet, as experiments clearly deliver.

Item Type:Article
Keywords:F(0)(1500) decay, High-statistics, Sigma-Meson, Nonet, Model, Confirmation, Resonance, Loops.
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Publisher statement:© 2002 by The American Physical Society. All rights reserved.
Record Created:28 Apr 2008
Last Modified:05 Aug 2011 14:13

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