Photoproduction of multi-meson final states — recent results from the Crystal-Barrel/TAPS experiment at ELSA-

U. Thoma (for the CBELSA/TAPS collaboration)

doi:10.1088/1674-1137/33/12/010

Chinese Physics C> 2009, Vol. 33> Issue(12) : 1105-1112 DOI: 10.1088/1674-1137/33/12/010

Photoproduction of multi-meson final states — recent results from the Crystal-Barrel/TAPS experiment at ELSA-

U. Thoma (for the CBELSA/TAPS collaboration)

(HISKP, Universität Bonn, Nussallee 14-16, 53115 Bonn, Germany)

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Abstract：
Multi-meson final states such as γp→pπ⁰π⁰ and γp→pπ⁰η have been investigated with the Crystal-Barrel/TAPS experiment at ELSA. Baryon cascades via Δπ and Δη and also via higher mass baryon resonances are clearly observed. Based on this data and on data from other reactions a partial wave analysis has been performed from which partial decay widths of various N^* and Δ^* states into the different pπ⁰π⁰ and pπ⁰η decay channels have been determined, leading partly to unexpected results. In addition, polarisation observables have been investigated. The beam asymmetry ∑ has been determined for both reactions and double polarisation data using a longitudinally polarised target and a circularly or linearly polarised photon beam has been taken. Given the angular coverage of the Crystal-Barrel/TAPS experiment this data covers almost the full angular range and phase space. This data will provide new and important information for the partial wave analyses and bring us one step closer towards a complete experiment.

References

[1]

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U. Thoma (for the CBELSA/TAPS collaboration). Photoproduction of multi-meson final states — recent results from the Crystal-Barrel/TAPS experiment at ELSA-[J]. Chinese Physics C, 2009, 33(12): 1105-1112. doi: 10.1088/1674-1137/33/12/010

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Received: 2009-08-07
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沈阳化工大学材料科学与工程学院沈阳 110142

Photoproduction of multi-meson final states — recent results from the Crystal-Barrel/TAPS experiment at ELSA-

(HISKP, Universität Bonn, Nussallee 14-16, 53115 Bonn, Germany)

Received Date: 2009-08-07

Accepted Date: 1900-01-01

Available Online: 2009-12-05

Abstract:

Multi-meson final states such as γp→pπ⁰π⁰ and γp→pπ⁰η have been investigated with the Crystal-Barrel/TAPS experiment at ELSA. Baryon cascades via Δπ and Δη and also via higher mass baryon resonances are clearly observed. Based on this data and on data from other reactions a partial wave analysis has been performed from which partial decay widths of various N^* and Δ^* states into the different pπ⁰π⁰ and pπ⁰η decay channels have been determined, leading partly to unexpected results. In addition, polarisation observables have been investigated. The beam asymmetry ∑ has been determined for both reactions and double polarisation data using a longitudinally polarised target and a circularly or linearly polarised photon beam has been taken. Given the angular coverage of the Crystal-Barrel/TAPS experiment this data covers almost the full angular range and phase space. This data will provide new and important information for the partial wave analyses and bring us one step closer towards a complete experiment.

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Photoproduction of multi-meson final states — recent results from the Crystal-Barrel/TAPS experiment at ELSA-

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