Investigation of the reaction pp-&gt;p K0 pi+ Lambda in search of the pentaquark

Nekipelov, M.; Sibirtsev, A.; Keshelashvili, I.; Ströher, H.; Valdau, Yu.; Maeda, Y.; Kleber, V.; Koptev, V.; Mikirtychiants, S.; Hartmann, M.; Schleichert, R.; Büscher, M.

doi:10.1088/0954-3899/34/4/002

Journal Article

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

Nekipelov, M.FZJ* ; Büscher, M.FZJ* ; Hartmann, M.FZJ* ; Keshelashvili, I. ; Kleber, V. ; Koptev, V. ; Maeda, Y. ; Mikirtychiants, S.FZJ* ; Schleichert, R.FZJ* ; Sibirtsev, A.FZJ* ; Ströher, H.FZJ* ; Valdau, Y.FZJ*

2007
IOP Publ. Bristol

Journal of physics / G 34, 627 - 635 (2007) [10.1088/0954-3899/34/4/002]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10549 doi:10.1088/0954-3899/34/4/002

Abstract: The reaction pp -> pK(0)pi(+) Lambda has been studied with the ANKE spectrometer at COSY-Julich 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 pK(0) system. By detecting four charged particles in the final state (pi(+), pi(-) and two protons), the K-0 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 -> pK(0)pi(+) Lambda has been deduced, as well as an upper limit for the Theta(+) production cross section. The intermediate Delta K-++(0) Lambda state seems to provide a significant contribution to the reaction.

Keyword(s): p p: exclusive reaction ; pentaquark: search for ; Lambda: hadroproduction ; K0: associated production ; pi+: associated production ; mass spectrum: missing-mass ; channel cross section: momentum dependence ; Theta(1540): hadroproduction ; Delta(1232)++: intermediate state ; upper limit ; magnetic spectrometer: experimental results ; Juelich COSY PS ; p p --> Lambda p K0 pi+ ; 3.65 GeV/c

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Note: Record converted from VDB: 12.11.2012; 10 pages, 7 figures: text changed, references added, style file changed Journal-ref: J. Phys. G: Nucl. Part. Phys. 34 (2007) 627.

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