Recent results for single meson production from the Crystal-Barrel/TAPS experiment at ELSA

R. Beck (for the CBELSA/TAPS collaboration)

doi:10.1088/1674-1137/33/12/003

Chinese Physics C> 2009, Vol. 33> Issue(12) : 1056-1062 DOI: 10.1088/1674-1137/33/12/003

Recent results for single meson production from the Crystal-Barrel/TAPS experiment at ELSA

R. Beck (for the CBELSA/TAPS collaboration)

(HISKP University of Bonn, 53115 Bonn, Germany)

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Abstract：
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 γp→pπ⁰ and γp→pη for both circularly and linearly polarized photons and a longitudinally polarized target are presented. Preliminary results for the beam asymmetry ∑ 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.

References

[1]

. Chiang W, Tabakin F. Phys. Rev. C, 1997, 55: 20542. CBELSA/TAPS publications on single Π0-photoproduction Bartholomy O et al. Phys. Rev. Lett., 2005, 94: 012003;van Pee H et al. Eur. Phys. J. A, 2007, 31: 613. CBELSA/TAPS publications on single η-photoproduction Bartholomy O et al., Eur. Phys. J. A, 2007, 33: 133;Crede V et al. Phys. Rev. Lett., 2005, 94: 012004;Elsner D et al. Eur. Phys. J. A, 2007, 33: 1474. Schmidt A et al. Phys. Rev Lett., 2001, 87: 2325015. Beck R et al. Phys. Rev. C, 2000, 61: 0352046. Watson K M. Phys. Rev., 1954, 182: 2287. Grushin V. Photoproduction of Pions on Nucleons and Nu-clei, proceedings of the lebedev Physics Institute Academy of Science of the USSR (Nova Scince Publishers, New Yorkand Budapest, 1989), Vol. 1868. Ahrens J et al. Phys Rev. Lett., 2002, 88: 2320029. Thoma U. Multi-meson-production from CBELSA/TAPS,Proc. NSTAR200910. Schmieden H. Vector meson production at ELSA, Proc.NSTAR200911. Thoma U, Fuchs M et al. Phys. Lett. B, 2008, 659: 8712. Gottschall M. PhD. thesis (in preparation), Bonn (2009)13. Thiel A. PhD. thesis (in preparation), Bonn (2009)14. Bartalini O et al. Eur. Phys. J. A, 2005, 26: 399

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R. Beck (for the CBELSA/TAPS collaboration). Recent results for single meson production from the Crystal-Barrel/TAPS experiment at ELSA[J]. Chinese Physics C, 2009, 33(12): 1056-1062. doi: 10.1088/1674-1137/33/12/003

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Received: 2009-08-07
Revised: 1900-01-01

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Recent results for single meson production from the Crystal-Barrel/TAPS experiment at ELSA

R. Beck (for the CBELSA/TAPS collaboration)

(HISKP University of Bonn, 53115 Bonn, Germany)

Received Date: 2009-08-07
Accepted Date: 1900-01-01
Available Online: 2009-12-05

Abstract:

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 γp→pπ⁰ and γp→pη for both circularly and linearly polarized photons and a longitudinally polarized target are presented. Preliminary results for the beam asymmetry ∑ 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.