DPG Phi
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Berlin 2005 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 31: Elektromagnetische und Hadronische Proben

HK 31.3: Talk

Tuesday, March 8, 2005, 17:00–17:15, TU MA004

Two-Pion Production and the Question of Isospin Breaking and/or Bose-Einstein correlations — •T. Skorodko, M. Bashkanov, H. Clement, E. Doroshkevich, M. Kaskulov, O. Khakimova, F. Kren, R. Meier, and G. J. Wagner — Physikalisches Institut, Universität Tübingen

The ππ production in pp collisions has been measured at CELSIUS in the energy range Tp = 775 − 1360 MeV exclusively using the WASA 4π detector with hydrogen pellet target. At energies close to threshold the data on the ppπ+ π channel can be well described by either the Roper resonance concept or a dynamic formation of the σ meson. At higher energy the formation of the ΔΔ system becomes increasingly dominant. In particular the data are consistent with the special configuration (ΔΔ)0+. The ppπ0 π0 channel basically shows a very similar behavior as expected from isospin invariance. However, Mπ0 π0 shows systematically an enhancement at small invariant masses. The deduced correlation function resembles very much that for Bose-Einstein correlations (BEC). two Alternatively the observed enhancements could be indicative of a (dynamic) isospin breaking possibly due to ππ rescattering in the σ channel. In order to discriminate both scenarios we have investigated also pd3Heππ. In contrast to Mπ+π, Mπ0π0 exhibits again a strong enhancement at low masses, this time even substantially larger than 2, the BEC limit, favoring thus an isospin breaking scenario for the observed effects.
supported by BMBF (06 TU 201), DFG (Europ. Graduiertenkolleg), and Landesforschungsschwerpunkt (Quasiteilchen)

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