First observation of the sigma(+)(c) baryon and a new measurement of the sigma(+)(c) mass

• Published in: Physical review letters 2001-02, Vol.86 (7), p.1167-1170
• Main Authors: Ammar, R, Bean, A, Besson, D, Davis, R, Kwak, N, Zhao, X, Anderson, S, Frolov, V V, Kubota, Y, Lee, S J, Mahapatra, R, O'Neill, J J, Poling, R, Riehle, T, Smith, A, Stepaniak, C J, Urheim, J, Ahmed, S, Alam, M S, Athar, S B, Jian, L, Ling, L, Saleem, M, Timm, S, Wappler, F, Anastassov, A, Duboscq, J E, Eckhart, E, Gan, K K, Gwon, C, Hart, T, Honscheid, K, Hufnagel, D, Kagan, H, Kass, R, Pedlar, T K, Schwarthoff, H, Thayer, J B, von Toerne, E, Zoeller, M M, Richichi, S J, Severini, H, Skubic, P, Undrus, A, Chen, S, Fast, J, Hinson, J W, Lee, J, Miller, D H, Shibata, E I, Shipsey, I P, Pavlunin, V, Cronin-Hennessy, D, Lyon, A L, Thorndike, E H, Jessop, C P, Marsiske, H, Perl, M L, Savinov, V, Zhou, X, Coan, T E, Fadeyev, V, Maravin, Y, Narsky, I, Stroynowski, R, Ye, J, Wlodek, T, Artuso, M, Ayad, R, Boulahouache, C, Bukin, K, Dambasuren, E, Karamov, S, Majumder, G, Moneti, G C, Mountain, R, Schuh, S, Skwarnicki, T, Stone, S, Viehhauser, G, Wang, J C, Wolf, A, Wu, J, Kopp, S, Mahmood, A H, Csorna, S E, Danko, I, McLean, K W, Márka, S, Xu, Z, Godang, R, Kinoshita, K, Lai, I C, Schrenk, S, Bonvicini, G, Cinabro, D, McGee, S, Perera, L P, Zhou, G J, Lipeles, E
• Format: Article
• Language: English
• ISSN: 0031-9007
• DOI: 10.1103/PhysRevLett.86.1167

Using data recorded with the CLEO II and CLEO II.V detector configurations at the Cornell Electron Storage Rings, we report the first observation and mass measurement of the Sigma(*+)(c) charmed baryon, and an updated measurement of the mass of the Sigma(+)(c) baryon. We find M(Sigma(*+)(c))-M(Lambda(+)(c)) = (231.0+/-1.1+/-2.0) MeV, and M(Sigma(+)(c))-M(Lambda(+)(c)) = (166.4+/-0.2+/-0.3) MeV, where the errors are statistical and systematic, respectively.