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A search for narrow Theta(1540)^+, a candidate for pentaquark baryon withpositive strangeness, has been performed in an exclusive proton-inducedreaction p+C(N) \to Theta^+ \bar{K}^0 + C(N) on carbon nuclei or quasifreenucleons at E_{beam}=70 GeV (sqrt{s} = 11.5 GeV) studying nK^+, pK_S and pK_Ldecay channels of Theta(1540)^+ in four different final states of the Theta^+\bar{K}^0 system. In order to assess the quality of the identification of thefinal states with neutron or K_L we reconstructed Lambda(1520)\to nK_S andphi\to K_LK_S decays in the calibration reactions p+C(N)\to Lambda(1520)K^+ +C(N) and p+C(N)\to p\phi + C(N). We found no evidence for narrow pentaquarkpeak in any of the studied final states and decay channels. Assuming that theproduction characteristics of the Theta^+ \bar{K^0} system are not drasticallydifferent from those of the Lambda(1520)K^+ and p\phi systems, we establishedupper limits on the cross section ratiossigma(Theta^+\bar{K}^0)/sigma(Lambda(1520)K^+) < 0.02 andsigma(Theta^+\bar{K}^0)/sigma(p\phi) < 0.15 at 90% CL and a preliminary upperlimit for the forward hemisphere cross section sigma(Theta^+\bar{K}^0) < 30nb/nucleon.Comment: 14 pages; 16 figures. Based on talks given by V.F.Kurshetsov at the  IHEP seminar (Protvino, IHEP, February 5, 2004) and at the session of Nuclear  Department of Russian Academy of Science (Moscow, ITEP, March 5, 2004

Search for ${\rm\Theta}(1540)^ + $ in the exclusive proton-induced reaction ${\rm p + {C(N)\to \Theta^ + \bar{K}^0 + {C}(N)}}$ at the energy of 70 GeV