Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 44: Electromagnetic and Hadronic Probes VII

HK 44.4: Talk

Thursday, March 11, 2004, 17:45–18:00, B

Search for the Θ⁺(1530) in the reaction γ p→K⁰Θ⁺→ p 4π⁰ — •Mariana Nanova — II. Physikalisches Institut, Heinrich-Buff-Ring 16, 35392 Giessen

The recently discovered Θ⁺(1530) pentaquark state [1,2,3] has been searched for in the reaction γ p→K⁰Θ⁺→ K_s⁰ p K_s⁰→ p 4π⁰. The experiment has been performed at the tagged photon facility of the ELSA accelerator (Bonn), using photons in the energy range up to 3.5 GeV. The 8 photon final state is detected in the Crystal Barrel and TAPS detector system which provides an almost 4π coverage for photon detection. The analysis has been checked by studying known reactions leading to the same final state, i.e. γ p→ p π⁰ η→ p 4π⁰ ; γ p→ K⁰π⁰Σ⁺(1189)→ p 4π⁰; γ p→ K⁰ K⁰ p→ p 4π⁰. Data have been taken using lineary polarised photons with the polarisation peak at 1950 MeV. The status of the ongoing analysis will be reported.

[1] D. Diakonov, V. Petrov and M. Polyakov, Z. Phys. A 359, 305 (1997)

[2] T. Nakano et al.[LEPS Collaboration], Phys. Rev. Lett. 91 (2003)

[3] S. Stepanyan et al. [CLAS Collaboration], arXiv:hep-ex/0307018