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27 April 2024

» arxiv » hep-ex/0407026

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Search for Theta(1540)^+ in exclusive proton-induced reaction p+C(N) o Theta^+ ar{K}^0 + C(N) at the energy of 70 GeV
SPHINX Collaboration : Yu. M. Antipov ; A. V. Artamonov ; V. A. Batarin ; O. V. Eroshin ; V. Z. Kolganov ; A. S. Konstantinov ; A. P. Kozhevnikov ; V. F. Kurshetsov ; A. E. Kushnirenko ; L. G. Landsberg ; V. M. Leontiev ; G. S. Lomkatsi ; V. A. Mukhin ; V. V. Molchanov ; A. P. Nilov ; D. I. Patalakha ; S. V. Petrenko ; A. I. Petrukhin ; V. T. Smolyankin ; D. V. Vavilov ; V. A. Victorov ;
Date:	14 Jul 2004
Journal:	Eur.Phys.J. A21 (2004) 455-468
Subject:	hep-ex
Abstract:	A search for narrow Theta(1540)^+, a candidate for pentaquark baryon with positive strangeness, has been performed in an exclusive proton-induced reaction p+C(N) o Theta^+ ar{K}^0 + C(N) on carbon nuclei or quasifree nucleons at E_{beam}=70 GeV (sqrt{s} = 11.5 GeV) studying nK^+, pK_S and pK_L decay channels of Theta(1540)^+ in four different final states of the Theta^+ ar{K}^0 system. In order to assess the quality of the identification of the final states with neutron or K_L we reconstructed Lambda(1520) o nK_S and phi o K_LK_S decays in the calibration reactions p+C(N) o Lambda(1520)K^+ + C(N) and p+C(N) o pphi + C(N). We found no evidence for narrow pentaquark peak in any of the studied final states and decay channels. Assuming that the production characteristics of the Theta^+ ar{K^0} system are not drastically different from those of the Lambda(1520)K^+ and pphi systems, we established upper limits on the cross section ratios sigma(Theta^+ar{K}^0)/sigma(Lambda(1520)K^+) < 0.02 and sigma(Theta^+ar{K}^0)/sigma(pphi) < 0.15 at 90% CL and a preliminary upper limit for the forward hemisphere cross section sigma(Theta^+ar{K}^0) < 30 nb/nucleon.
Source:	arXiv, hep-ex/0407026
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