2005/11/05 by Aslanyan, P. Zh.
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex)
paper · doi:10.48550/arxiv.hep-ex/0511017
Experimental data from the 2m propane bubble chamber for production of Λ, K0s have been used to search of exotic baryon states, in the Ks0 p, Ks0 Λ and Λp decay mode for the reaction p+propane at 10 GeV/c. The estimation of experimental inclusive cross sections for Λ and K0s production in the p12C collision is equal to σΛ= 13.3±1.7 mb and σK0s= 3.8±0.6 mb, respectively. The measured Λ/π+ ratio from pC reaction is equal to (5.3±0.8)*10-2. The experimental Λ/π+ ratio from the pC reaction is approximately two times larger than the Λ/π+ ratio simulated by FRITIOF model from the pC reaction. The invariant mass spectrum ΛK0s registered narrow peaks in regions of 1750 and 1795 MeV/c2. The statistical significance of these peaks has been estimated as 5.6 and 3.3 S.D., respectively. These would be candidates for the N0 or the Ξ0 pentaquark states. The pK0s invariant mass spectrum shows resonant structures with MKs0 p=1540, 1613, 1821 MeV/c2. The statistical significance of these peaks have been estimated as 5.5,4.8 and 5.0 s.d., respectively. The invariant mass spectrum S=-1 Λp observed a narrow peaks at 2100, 2175,2285 and 2353 MeV/c2. Their excess above background by the second method is 6.9, 4.9, 3.8 and 2.9 S.D., respectively.