Search for the Θ+ pentaquark in the γd→ΛnK+ reaction measured with the CLAS spectrometer
Physical Review Letters(2006)
Abstract
For the first time, the reaction gamma d -> Lambda n K+ has been analyzed in order to search for the exotic pentaquark baryon Theta+(1540). The data were taken at Jefferson Lab, using the Hall-B tagged-photon beam of energy between 0.8 and 3.6 GeV and the CEBAF Large Acceptance Spectrometer (CLAS). No statistically significant structures were observed in the nK+ invariant mass distribution. The upper limit on the gamma d -> Lambda Theta+ integrated cross section has been calculated and found to be between 5 and 25 nb, depending on the production model assumed. The upper limit on the differential cross section is also reported.
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the<mmlmath xmlnsmml=http//wwww3org/1998/math/mathml,display=inline><mmlmi>γ</mmlmi><mmlmi>d</mmlmi><mmlmo>→</mmlmo><mmlmi>λ</mmlmi><mmlmi>n</mmlmi><mmlmsup><mmlmi>k</mmlmi><mmlmo>+</mmlmo></mmlmsup></mmlmath>reaction
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