CERN Accelerating science

Preprint
Report number	E1-2005-149 ; JINR-E1-2005-149
Title	Exotic Narrow Resonance Searches in the System $\Lambda K^0_s$ in $p$+Propane Collisions at 10 GeV/$c$
Author(s)	Aslanyan, P Zh ; Emelyanenko, V N ; Rikhvitzkaya, G G
Affiliation	(Yerevan State University, Armenia) ; (Veksler and Baldin Laboratory of High Energies, Dubna)
Publication	2005
Imprint	5 Oct 2005
Number of pages	9
Published in:	Part. Nucl. Lett.
Presented at	17th Rencontre de Blois : 11th International Conference on Elastic and Diffractive Scattering : Towards High Energy Frontiers, Blois, France, 15 - 20 May 2005
Subject category	Particle Physics - Experiment
Abstract	A number of peculiarities were found in the effective mass spectrum of system $\Lambda K^0_s$ in the ranges 1650-1680, 1740-1750, 1785-1805 and 1925-1950 MeV/$c^2$ in collisions of protons of a 10 GeV/$c$ momentum with propane. A detailed research of structure of mass spectrum has shown that the maximum statistical significance, equal to 5.6 and 3.3 SD, has been obtained in effective mass ranges (1750$\pm$18) and (1795$\pm$20) MeV/$c2$. These peaks are possible candidates for two pentaquark states: the $N^0$ with quark content $udsds$ decaying into $\Lambda K^0_s$ and the $\Xi^0$ with quark content $udssd$ decaying into $\Lambda \overline{K^0_s}$.
Submitted by	[email protected]