Search for the Theta+ pentaquark in the gamma d -> Lambda n K+ reaction measured with CLAS

Details Search for the Theta+ pentaquark in the gamma d -> Lambda n K+ reaction measured with CLAS Search for the Theta+ pentaquark in the gamma d -> Lambda n K+ reaction measured with CLAS

2006-04-26

arxiv.org/abs/hep-ex/0604047v1

Phys.Rev.Lett.97:032001,2006

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.97.032001

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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