Inclusive production of $\Lambda$, $K_s^0$ and exotic narrow resonances for systems $K_s^{0}p$, $K_s^0\Lambda$, $\Lambda p$ from p+propane interactions at 10 GeV/c

Abstract

Experimental data from the 2m propane bubble chamber for production of $\Lambda$, $K_s^0$ have been used to search of exotic baryon states, in the $K_s^{0}p$, $K_s^0\Lambda$ and $\Lambda p$ decay mode for the reaction p+propane at 10 GeV/c. The estimation of experimental inclusive cross sections for $\Lambda$ and $K_s^0$ production in the p${}^{12}C$ collision is equal to ${\sigma }_{\Lambda }$= 13.3$\pm$1.7 mb and ${\sigma }_{K_s^0}$= 3.8$\pm$0.6 mb, respectively. The measured $\Lambda /{\pi }^{+}$ ratio from pC reaction is equal to (5.3$\pm 0.8)\ast 10^{-2}$. The experimental $\Lambda /{\pi }^{+}$ ratio from the pC reaction is approximately two times larger than the $\Lambda /{\pi }^{+}$ ratio simulated by FRITIOF model from the pC reaction. The invariant mass spectrum $\Lambda K_s^0$ registered narrow peaks in regions of 1750 and 1795 MeV/$c^2$. The statistical significance of these peaks has been estimated as 5.6 and 3.3 S.D., respectively. These would be candidates for the $N^0$ or the ${\Xi }^0$ pentaquark states. The $p{K}_s^0$ invariant mass spectrum shows resonant structures with $M_{K_s^{0}p}$=1540, 1613, 1821 MeV/$c^2$. 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 $\Lambda p$ observed a narrow peaks at 2100, 2175,2285 and 2353 MeV/$c^2$. Their excess above background by the second method is 6.9, 4.9, 3.8 and 2.9 S.D., respectively.

6 pages, 3 figures, Proc. workshop on "Quark-Gluon-Plasma Thermalization",Vienna, Austria, August 10-12, 2005