The present focus of the CBELSA/TAPS experiment is on meson-photoproduction off the nucleon using polarized photons and polarized targets. Here first preliminary results on the reactions γ~→p~→→ pπ~0 and γ~→p~→pη for both circularly and linearly polarized photons and a longitudinally polarized target are presented. Preliminary results for the beam asymmetry Σ and the double polarization observable G have been extracted for both reactions using the linear polarization data. From the circular polarization data the observable E has been determined. Due to the near 4π angular coverage of the detector system these results cover almost the full solid angle.
参考文献
| [1] | Chiang W;Tabakin F .[J].Physical Review C:Nuclear Physics,1997,55:2054. |
| [2] | Bartholomy O et al.[J].Physical Review Letters,2005,94:012003. |
| [3] | van Pee H;Bartholomy O;Crede V;Anisovich AV;Anton G;Bantes R;Beloglazov Y;Bogendorfer R;Castelijns R;Ehmanns A .Photoproduction of pi(0)-mesons off protons from the Delta(1232) region to E-gamma=3 GeV[J].The European Physical Journal, A. Hadrons and Nuclei,2007(1):61-77. |
| [4] | Bartholomy O;Bogendorfer R;Crede V;Fabry I;Anisovich AV;Anton G;Bantes R;Beloglazov YA;Castelijns R;Ehmanns A .Photoproduction of eta-mesons off protons[J].The European Physical Journal, A. Hadrons and Nuclei,2007(2):133-146. |
| [5] | Crede V et al.[J].Physical Review Letters,2005,94:012004. |
| [6] | Elsner D;Anisovich AV;Anton G;Bacelar JCS;Bantes B;Bartholomy O;Bayadilov DE;Beck R;Beloglazov YA;Bogendorfer R .Measurement of the beam asymmetry in eta photoproduction off the proton[J].The European Physical Journal, A. Hadrons and Nuclei,2007(2):147-155. |
| [7] | Schmidt A et al.[J].Physical Review Letters,2001,87:232501. |
| [8] | Beck R et al.[J].Physical Review C:Nuclear Physics,2000,61:035204. |
| [9] | Watson K M .[J].Physical Review,1954,182:228. |
| [10] | Grushin V.Photoproduction of Pions on Nucleons and Nuclei[A].Nova Scince Publishers,New York and Budapest,1989 |
| [11] | Ahrens J et al.[J].Physical Review Letters,2002,88:232002. |
| [12] | Thoma U.Multi-meson-production from CBELSA/TAPS[A]. |
| [13] | Schmieden H.Vector meson production at ELSA[A]. |
| [14] | Thoma U;Fuchs M;Anisovich AV;Anton G;Bantes R;Bartholomy O;Beck R;Beloglazov Y;Crede V;Ehmanns A .N* and Delta* decays into N pi(0)pi(0)[J].Physics Letters, B. Nuclear Physics and High Energy Physics,2008(1/2):87-93. |
| [15] | Gottschall M .[D].Bonnevue,2009. |
| [16] | Thiel A .[D].Bonnevue,2009. |
| [17] | Bartalini O;Bellini V;Bocquet JP;Capogni M;Casano L;Castoldi M;Calvat P;D'Angelo A;Di Salvo R;Fantini A .Measurement of pi(0) photoproduction on the proton from 550 to 1500 MeV at GRAAL[J].The European Physical Journal, A. Hadrons and Nuclei,2005(3):399-419. |
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