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Workshop on the Physics of Excited Nucleons, Sept. 5-8, 2007, Bonn, Germany – Alexander Titov 1
Alexander TitovForschungzentrum Rossendorf/Dresden
andJoint Institute for Nuclear Research Dubna
Photoproduction of meson off the deuteron
near threshold
Workshop on the Physics of Excited Nucleons
PRC 76, 035202 (2007)
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Workshop on the Physics of Excited Nucleons, Sept. 5-8, 2007, Bonn, Germany – Alexander Titov 2
Talk OutlineTalk Outline
Motivation: puzzles in p->p photoproduction (LEPS)
Coherent D->Dreaction In-coherent D->npreaction Spin-density matrix elements Summary
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Workshop on the Physics of Excited Nucleons, Sept. 5-8, 2007, Bonn, Germany – Alexander Titov 3
A.T.&T.-S.H.Lee, PRC 67 (2003)
previous experience in reaction
Motivation:
In following we discuss the diffractive part
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Puzzle # 1
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Puzzle # 2
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Workshop on the Physics of Excited Nucleons, Sept. 5-8, 2007, Bonn, Germany – Alexander Titov 6
Nature of the bump: The large amount of un-natural parity ( meson)exchange can not produce the bump:
But this admixture of un-natural parity exchange gives sizable background for possible (real) interference
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Workshop on the Physics of Excited Nucleons, Sept. 5-8, 2007, Bonn, Germany – Alexander Titov 7
Pomeron: modified Donnachie-Landshoff model
PS – exchange
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coherent
incoherent
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coherent
incoherent
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Photoproduction from iso-scalar nucleon
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GJ system
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H system
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SummarySummary
2. There is no bump-like behavior in reaction. The model satisfactory unpolarized cross sections and spin observables, which, in particular, indicate to elimination of the un-natural parity exchange processes.
3. Possible explanation of the existence of the bump-like structure in and its absence in reaction may indicate for contribution exotic channel with properties of the scalar – isovector meson exchange.
1. The model describes reasonably and spin
observables in reaction in diffraction region
at finite |t |, but it fails in description of the bump-like
behavior of at