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
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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