Properties of the a0 resonances

Details Properties of the a0 resonances Properties of the a0 resonances

2002-09-25

arxiv.org/abs/hep-ph/0209304v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 3 figures, needs espcrc2.sty. Talk given by L. Lesniak at the QCD 2002 Conference, Montpellier, France, 2-9 July 2002

Scientific paper

10.1016/S0920-5632(03)01827-9

We present results following from the coupled channel model of two a0 resonances decaying into the pi-eta and K anti-K mesons. The a0(980) resonance can be described by two distinct poles. It is shown that the discrepancy in the a0(980) mass position between the Crystal Barrel Collaboration and the E852 Group can be explained and removed. In our model with parameters fixed by the present experimental data the a0(980) cannot be interpreted as a bound K anti-K state although the K anti-K forces in the S-wave isovector channel are attractive.

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