Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 11: Poster Session: Electromagnetic and Hadronic Probes

HK 11.9: Poster

Tuesday, March 9, 2004, 13:30–15:30, Foyer

Charge symmetry breaking as a probe for the real part of η–nucleus scattering lengths — •Vadim Baru¹, Johann Haidenbauer¹, Christoph Hanhart¹, and Jouni Niskanen² — ¹IKP-Th, FZ Jülich, 52425 Jülicj — ²Department of Physical Sciences, University of Helsinki

On the example of the reactions pd→  ³Hπ⁺/³Heπ⁰ we demonstrate that one can use the occurrence of charge symmetry breaking as a tool to explore the η–nucleus interaction near the η threshold [1]. Based on indications that the cross section ratio of π⁺ and π⁰ production on nuclei deviates from the isotopic value in the vicinity of the η production threshold we argue that a systematic study of this ratio as a function of the energy would allow to pin down the sign of the real part of the η-nucleus scattering length. The knowledge of this sign is important for drawing conclusions about the possible existence of η-nucleus bound states.

[1] V. Baru, J. Haidenbauer, C. Hanhart and J. A. Niskanen, scattering lengths,” Phys. Rev. C 68, 035203 (2003).