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

M. Nekipelov·M. Buescher·M. Hartmann·I. Keshelashvili·V. Kleber·V. Koptev·Y. Maeda·S. Mikirtychiants·R. Schleichert·A. Sibirtsev·H. Stroeher·Yu. Valdau
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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.

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M. Nekipelov, M. Buescher, M. Hartmann, I. Keshelashvili, V. Kleber, V. Koptev, Y. Maeda, S. Mikirtychiants, R. Schleichert, A. Sibirtsev, H. Stroeher, Yu. Valdau. 2006-12-13. Investigation of the reaction pp->p K0 pi+ Lambda in search of the pentaquark. https://doi.org/10.1088/0954-3899%2F34%2F4%2F002

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