Investigation of the reaction pp->p K0 pi+ Lambda in search of the pentaquark

Abstract

The reaction pp->p K0 pi+ Lambda has been studied with the ANKE spectrometer at COSY-Juelich at a beam momentum of 3.65 GeV/c in order to search for a possible signal of the pentaquark Theta+(1540), decaying into the p K0 system. By detecting four charged particles in the final state, the K0 and the Lambda have been reconstructed to tag strangeness production. It has been found that the pi+ Lambda missing-mass spectrum displays no significant signal expected from the Theta+(1540) excitation. The total cross section for the reaction pp->p K0 pi+ Lambda has been deduced, as well as an upper limit for the Theta+ production cross section. The intermediate Delta++ K0 Lambda state is found to provide a significant contribution to the reaction.

arXiv comment10 pages, 7 figures; text changed, references added, style file changed

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Cited by in corpus (7)

• Medium effects in proton-induced $K^0$ production at 3.5 GeV
• Present status on experimental search for pentaquarks
• On the SigmaN cusp in the pp -> pK+Lambda reaction
• Associate K^0 production in p+p collisions at 3.5 GeV: The role of Delta(1232)++
• An explanation why the Theta+ is seen in some experiments and not in others
• A possible explanation why the Theta+ is seen in some experiments and not in others
• Medium effects in $\Lambda K^{+}$ pair production by 2.83 GeV protons on nuclei