Exotic Narrow Resonance Searches in the Systems K[sub s][sup 0]p, K[sub s][sup 0]Λ and Λp in pA-Interactions at 10 GeV/c

Abstract

Experimental data from the 2m propane bubble chamber have been analyzed to search for an exotic baryon states, in the Ks0p, Ks0Λ and Λp decay mode for the reaction p+C3H8 at 10 GeV/c.In the invariant mass spectrum ΛKs0 narrow peaks are observed at 1750, 1795, 1850 MeV/c2. The statistical significance of these peaks has been estimated as 5.6, 3.3 and 3.0 S.D., respectively. There are small enhancements in mass regions of (1650–1675) and (1925–1950) MeV/c2. These would be candidates for the N0 or the Ⅺ0 pentaquark states.The pKs0 invariant mass spectrum shows resonant structures with MKs0p=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. There are also small peaks in 1487 (3 s.d.), 1690 (3.6 s.d.), 1750 (2.3 s.d.) and 1980 (3.0 s.d.) MeV/c2 mass regions.In the invariant mass spectrum S=−1 Λp narrow peaks at 2100, 2175, 2285 and 2353 MeV/c2 are observed. Their excess above background by the second method is 6.9, 4.9, 3.8 and 2.9 S.D., respectively. There is also a small peak in 2225 (2.2 s.d.) MeV/c2 mass region.The investigation has been performed at the Veksler and Baldin Laboratory of High Energies, JINR.