%O © 2006 The American Physical Society %D 2006 %V 97 %N 16 %L discovery1308520 %I AMERICAN PHYSICAL SOC %K OCTET QUARKONIA PRODUCTION, CHARMED BARYON, MODEL, SPECTROSCOPY, LAMBDA(+)(C), TEVATRON, SYMMETRY, MASS %X We report the first observation of two charmed strange baryons that decay into Lambda K-+(c)-pi(+). The broader of the two states is measured to have a mass of 2978.5 +/- 2.1 +/- 2.0 MeV/c(2) and a width of 43.5 +/- 7.5 +/- 7.0 MeV/c(2). The mass and width of the narrow state are measured to be 3076.7 +/- 0.9 +/- 0.5 MeV/c(2) and 6.2 +/- 1.2 +/- 0.8 MeV/c(2), respectively. We also perform a search for the isospin partner states that decay into Lambda K-+(c)S(0)pi(-) and observe a significant signal at the mass of 3082.8 +/- 1.8 +/- 1.5 MeV/c(2). The data used for this analysis were accumulated at or near the Upsilon(4S) resonance, using the Belle detector at the e(+)e(-) asymmetric-energy collider KEKB. The integrated luminosity of the data sample used is 461.5 fb(-1). %A R Chistov %A K Abe %A K Abe %A I Adachi %A H Aihara %A D Anipko %A V Aulchenko %A T Aushev %A AM Bakich %A V Balagura %A E Barberio %A A Bay %A I Bedny %A K Belous %A U Bitenc %A I Bizjak %A S Blyth %A A Bondar %A A Bozek %A M Bracko %A J Brodzicka %A TE Browder %A MC Chang %A Y Chao %A A Chen %A KF Chen %A WT Chen %A BG Cheon %A Y Choi %A YK Choi %A A Chuvikov %A S Cole %A J Dalseno %A M Danilov %A M Dash %A J Dragic %A A Drutskoy %A S Eidelman %A D Epifanov %A N Gabyshev %A A Garmash %A T Gershon %A A Go %A G Gokhroo %A B Golob %A A Gorisek %A H Ha %A J Haba %A T Hara %A K Hayasaka %A H Hayashii %A M Hazumi %A D Heffernan %A T Hokuue %A Y Hoshi %A S Hou %A WS Hou %A YB Hsiung %A T Iijima %A A Imoto %A K Inami %A A Ishikawa %A R Itoh %A M Iwasaki %A Y Iwasaki %A JH Kang %A N Katayama %A H Kawai %A T Kawasaki %A HR Khan %A H Kichimi %A HJ Kim %A HO Kim %A K Kinoshita %A S Korpar %A P Krizan %A P Krokovny %A R Kumar %A CC Kuo %A A Kuzmin %A YJ Kwon %A G Leder %A J Lee %A T Lesiak %A SW Lin %A D Liventsev %A F Mandl %A D Marlow %A T Matsumoto %A A Matyja %A S McOnie %A W Mitaroff %A K Miyabayashi %A H Miyake %A H Miyata %A Y Miyazaki %A R Mizuk %A GR Moloney %A T Nagamine %A E Nakano %A M Nakao %A S Nishida %A O Nitoh %A T Nozaki %A S Ogawa %A T Ohshima %A T Okabe %A S Okuno %A SL Olsen %A Y Onuki %A H Ozaki %A P Pakhlov %A G Pakhlova %A H Palka %A H Park %A KS Park %A R Pestotnik %A LE Piilonen %A Y Sakai %A T Schietinger %A O Schneider %A AJ Schwartz %A R Seidl %A ME Sevior %A M Shapkin %A H Shibuya %A B Shwartz %A V Sidorov %A JB Singh %A A Sokolov %A A Somov %A N Soni %A S Stanic %A M Staric %A H Stoeck %A T Sumiyoshi %A S Suzuki %A F Takasaki %A N Tamura %A M Tanaka %A GN Taylor %A Y Teramoto %A XC Tian %A I Tikhomirov %A T Tsuboyama %A T Tsukamoto %A S Uehara %A T Uglov %A K Ueno %A S Uno %A Y Usov %A G Varner %A S Villa %A CC Wang %A CH Wang %A MZ Wang %A Y Watanabe %A E Won %A CH Wu %A QL Xie %A BD Yabsley %A A Yamaguchi %A Y Yamashita %A M Yamauchi %A LM Zhang %A ZP Zhang %A Belle Collaboration %T Observation of new states decaying into Lambda K-c(-)pi(+) and Lambda K-+(c)S(0)pi(-) %J PHYS REV LETT