Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2007-02-09
Eur.Phys.J.A32:311-319,2007
Physics
Nuclear Physics
Nuclear Theory
11 pages, 5 figures
Scientific paper
10.1140/epja/i2007-10385-6
Incoherent photoproduction of eta-mesons on the deuteron is considered. The main attention is paid to the region above the S11(1535) resonance where rather narrow resonance like structure in the total cross section extracted for gamma n -> eta n has been reported. The corresponding experimental results are analyzed from the phenomenological standpoint within the model containing a baryon P11 with the mass about 1670 MeV and a width less than 30 MeV. This resonance was suggested in some recent works as a nonstrange member of the pentaquark antidecuplet with J^P=1/2^+. The calculation is also performed for the polarized and nonpolarized angular distributions of $\eta$ mesons. In addition, we present our predictions for the cross sections of the neutral kaons and double pion photoproduction, where the same narrow P11(1670) resonance is assumed to contribute through the decay into K^0 Lambda and pi Delta configuration.
Fix Alexander
Polyakov Maxim V.
Tiator Lothar
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