论文信息 - Measurement of polarization observables in multi-meson photoproduction off the proton with the CBELSA/TAPS experiment

Measurement of polarization observables in multi-meson photoproduction off the proton with the CBELSA/TAPS experiment

The reaction γp → pπ 0π 0 was analyzed using data of the CBELSA/TAPS experiment where linearly polarized photons impinged on a transversely polarized butanol target. Single and double polarization observables were extracted. Within the BnGa-PWA resonance parameters were determined. N∗ and ∆∗ resonances demonstrated systematic differences in their decay branching ratios via excited hadrons which hint at the internal structure of these states.

T. Seifen

[1] J. Schultes,et al. Polarization observables in double neutral pion photoproduction , 2022, 2207.01981.

[2] J. Hartmann. Measurement of Double Polarization Observables in the Reactions γp → pπ0 and γp → pη with the Crystal Barrel/TAPS Experiment at ELSA , 2017 .

[3] L. Pant,et al. Linearly polarised photon beams at ELSA and measurement of the beam asymmetry in $ \pi^{0}_{}$ photoproduction off the proton , 2008, 0810.1849.

[4] Wolfgang Hillert,et al. The Bonn Electron Stretcher Accelerator ELSA: Past and future , 2006 .

[5] A. Fix,et al. Double-pion photoproduction on nucleon and deuteron , 2005, nucl-th/0503042.

[6] G. Anton,et al. A scintillating fibre detector for the Crystal Barrel experiment at ELSA , 2005 .

[7] W. Roberts,et al. Polarization observables for two-pion production off the nucleon , 2004, nucl-th/0410012.

[8] S. Hasegawa,et al. A new frozen-spin target for 4π particle detection , 1999 .

[9] Claude Amsler,et al. The crystal barrel spectrometer at LEAR , 1992 .

[10] R. Novot. The BaF2 Photon Spectrometer TAPS , 1991 .

[11] P. Weilhammer,et al. High statistics study of the reaction π - p→ π - π + n: Apparatus, method of analysis, and general features of results at 17 GeV/ c , 1974 .