Münster 2002 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 43: Theory VII

HK 43.6: Vortrag

Donnerstag, 14. März 2002, 17:45–18:00, A

Production of the f₀(980) in the reaction π⁻p→π⁰π⁰n — •Felix Sassen, Siegfried Krewald, and Josef Speth — Forschungszentrum Jülich, IKP (Th), D-52425 Jülich

Lately the E852-Collaboration at Brookhaven published data on pion production in the charge exchange reaction π⁻p→π⁰π⁰n. [1] The published S-wave mass spectrum taken at low momentum transfer t to the nucleon shows a sharp dip at m_ππ≈ 1 GeV where as the same spectrum taken at high t exhibits a sharp peak at the same position.

This behaviour sheded some doubt on the interpretation of the f₀(980) as a KK molecule.[2] We show using a model with two production mechanisms (π- and a₁-exchange) that the above experimental results do not oppose the KK interpretation of the f₀(980). In our model the final state interaction between the outgoing pions is generated using the Jülich meson exchange model with dispersion theoratical form factors for t-channel exchanges.

[1] J.Gunter et al., Phys.Rev.D 64,072003(2001)

[2] V.V.Anisovich et al., Phys.Lett.B 355,363 (1995)