Observation of New States Decaying into {lambda}{sub c}{sup +}K{sup -}{pi}{sup +} and {lambda}{sub c}{sup +}K{sub S}{sup 0}{pi}{sup -}

Journal Article · Fri Oct 20 04:00:00 EDT 2006 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.97.162001· OSTI ID:20861010

Chistov, R; Aushev, T; Balagura, V; Danilov, M; Liventsev, D; Mizuk, R; Pakhlov, P; Pakhlova, G; Tikhomirov, I; Uglov, T ^[1]; Abe, K; Adachi, I; Dragic, J; Gershon, T; Haba, J; Hazumi, M; Itoh, R; Iwasaki, Y; Katayama, N; Kichimi, H ^[2]

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1. Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)
2. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)

We report the first observation of two charmed strange baryons that decay into {lambda}{sub c}{sup +}K{sup -}{pi}{sup +}. The broader of the two states is measured to have a mass of 2978.5{+-}2.1{+-}2.0 MeV/c{sup 2} and a width of 43.5{+-}7.5{+-}7.0 MeV/c{sup 2}. The mass and width of the narrow state are measured to be 3076.7{+-}0.9{+-}0.5 MeV/c{sup 2} and 6.2{+-}1.2{+-}0.8 MeV/c{sup 2}, respectively. We also perform a search for the isospin partner states that decay into {lambda}{sub c}{sup +}K{sub S}{sup 0}{pi}{sup -} and observe a significant signal at the mass of 3082.8{+-}1.8{+-}1.5 MeV/c{sup 2}. The data used for this analysis were accumulated at or near the {upsilon}(4S) resonance, using the Belle detector at the e{sup +}e{sup -} asymmetric-energy collider KEKB. The integrated luminosity of the data sample used is 461.5 fb{sup -1}.

• OSTI ID: 20861010
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 97; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
BEAM LUMINOSITY
HYPERONS
ISOSPIN
KAONS MINUS
KAONS NEUTRAL SHORT-LIVED
LAMBDA C PLUS BARYONS
MASS
MEV RANGE 10-100
PARTICLE DECAY
PIONS PLUS
RESONANCE
SIGNALS