M Nekipelov et al 2007 J. Phys. G: Nucl. Part. Phys. 34 627 doi:10.1088/0954-3899/34/4/002
M Nekipelov1,2, M Büscher1, M Hartmann1, I Keshelashvili1,3, V Kleber4, V Koptev2, Y Maeda5, S Mikirtychiants2, R Schleichert1, A Sibirtsev6, H Ströher1 and Yu Valdau1,2
Show affiliationsThe reaction pp → pK0π+Λ has been studied with the ANKE spectrometer at COSY-Jülich at a beam momentum of 3.65 GeV/c in order to search for a possible signal of the pentaquark Θ+(1540), decaying into the pK0 system. By detecting four charged particles in the final state (π+, π− and two protons), the K0 and the Λ have been reconstructed to tag strangeness production. It has been found that the π+Λ missing-mass spectrum displays no significant signal expected from the Θ+(1540) excitation. The total cross section for the reaction pp → pK0π+Λ has been deduced, as well as an upper limit for the Θ+ production cross section. The intermediate Δ++K0Λ state seems to provide a significant contribution to the reaction.
13.75.Cs Nucleon-nucleon interactions (including antinucleons, deuterons, etc.)
Issue 4 (April 2007)
Received 13 December 2006
Published 2 March 2007
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