Latest results from GRAAL collaboration

V. Bellini; J.P. Bouquet; L. Casano; A. D'Angelo; J.P. Didelez

doi:10.1088/1674-1137/33/12/032

Chinese Physics C> 2009, Vol. 33> Issue(12) : 1249-1253 DOI: 10.1088/1674-1137/33/12/032

Latest results from GRAAL collaboration

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Abstract：
The GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 MeV up to a maximum of
1500 MeV, of a liquid Hydrogen or Deuterium target and of the 4π Lagrange detector optimized for photon detection. It allows the study of pseudo-scalar and vector meson photoproduction on the nucleon in the energy range corresponding to the second and the third resonance regions. In the following, the Σ beam asymmetries in η and π⁰ photoproduction on quasi-free nucleon are shown. Also single and double polarization observables in K+Λ photoproduction on free proton are shown; they are important to confirm the role of new or poorly known resonances in the 1900 MeV mass region.

References

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. Babusci D et al. Il Nuovo Cimento A, 1990, 103: 1555-15762. Bartalini O et al. Eur. Phys. J. A, 2005, 26: 399-4193. Fantini A et al. Phys. Rev. C, 2008, 78: 015230-1-015230-124. di Salvo R et al. submitted Eur. Phys. J. A. the paper havebeen accepted5. Lleres A et al. Eur. Phys. J. A, 2007, 31: 79-936. Lleres A et al. Eur. Phys. J. A, 2009, 39: 149-1617. Bradford R K et al. Phys. Rev. C, 2007, 75: 035205-1-035205-25

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V. Bellini, J.P. Bouquet, L. Casano, A. D'Angelo and J.P. Didelez. Latest results from GRAAL collaboration[J]. Chinese Physics C, 2009, 33(12): 1249-1253. doi: 10.1088/1674-1137/33/12/032

V. Bellini, J.P. Bouquet, L. Casano, A. D'Angelo and J.P. Didelez. Latest results from GRAAL collaboration[J]. Chinese Physics C, 2009, 33(12): 1249-1253. doi: 10.1088/1674-1137/33/12/032 shu

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

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沈阳化工大学材料科学与工程学院沈阳 110142

Latest results from GRAAL collaboration

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

Abstract: The GRAAL experimental set-up consists of a polarized and tagged photon beam that covers an energy range from a minimum of 600 MeV up to a maximum of
1500 MeV, of a liquid Hydrogen or Deuterium target and of the 4π Lagrange detector optimized for photon detection. It allows the study of pseudo-scalar and vector meson photoproduction on the nucleon in the energy range corresponding to the second and the third resonance regions. In the following, the Σ beam asymmetries in η and π⁰ photoproduction on quasi-free nucleon are shown. Also single and double polarization observables in K+Λ photoproduction on free proton are shown; they are important to confirm the role of new or poorly known resonances in the 1900 MeV mass region.