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. 2001 Feb 12;86(7):1167-70.
doi: 10.1103/PhysRevLett.86.1167.

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

R Ammar, A Bean, D Besson, R Davis, N Kwak, X Zhao, S Anderson, V V Frolov, Y Kubota, S J Lee, R Mahapatra, J J O'Neill, R Poling, T Riehle, A Smith, C J Stepaniak, J Urheim, S Ahmed, M S Alam, S B Athar, L Jian, L Ling, M Saleem, S Timm, F Wappler, A Anastassov, J E Duboscq, E Eckhart, K K Gan, C Gwon, T Hart, K Honscheid, D Hufnagel, H Kagan, R Kass, T K Pedlar, H Schwarthoff, J B Thayer, E von Toerne, M M Zoeller, S J Richichi, H Severini, P Skubic, A Undrus, S Chen, J Fast, J W Hinson, J Lee, D H Miller, E I Shibata, I P Shipsey, V Pavlunin, D Cronin-Hennessy, A L Lyon, E H Thorndike, C P Jessop, H Marsiske, M L Perl, V Savinov, X Zhou, T E Coan, V Fadeyev, Y Maravin, I Narsky, R Stroynowski, J Ye, T Wlodek, M Artuso, R Ayad, C Boulahouache, K Bukin, E Dambasuren, S Karamov, G Majumder, G C Moneti, R Mountain, S Schuh, T Skwarnicki, S Stone, G Viehhauser, J C Wang, A Wolf, J Wu, S Kopp, A H Mahmood, S E Csorna, I Danko, K W McLean, S Márka, Z Xu, R Godang, K Kinoshita, I C Lai, S Schrenk, G Bonvicini, D Cinabro, S McGee, L P Perera, G J Zhou, E Lipeles, S P Pappas, M Schmidtler, A Shapiro, W M Sun, A J Weinstein, F Würthwein, D E Jaffe, G Masek, H P Paar, E M Potter, S Prell, V Sharma, D M Asner, A Eppich, T S Hill, R J Morrison, R A Briere, G P Chen, B H Behrens, W T Ford, A Gritsan, J Roy, J G Smith, J P Alexander, R Baker, C Bebek, B E Berger, K Berkelman, F Blanc, V Boisvert, D G Cassel, M Dickson, P S Drell, K M Ecklund, R Ehrlich, A D Foland, P Gaidarev, R S Galik, L Gibbons, B Gittelman, S W Gray, D L Hartill, B K Heltsley, P I Hopman, C D Jones, D L Kreinick, M Lohner, A Magerkurth, T O Meyer, N B Mistry, E Nordberg, J R Patterson, D Peterson, D Riley, J G Thayer, D Urner, B Valant-Spaight, A Warburton, P Avery, C Prescott, A I Rubiera, J Yelton, J Zheng, G Brandenburg, A Ershov, Y S Gao, D Y Kim, R Wilson, T E Browder, Y Li, J L Rodriguez, H Yamamoto, T Bergfeld, B I Eisenstein, J Ernst, G E Gladding, G D Gollin, R M Hans, E Johnson, I Karliner, M A Marsh, M Palmer, C Plager, C Sedlack, M Selen, J J Thaler, J Williams, K W Edwards, R Janicek, P M Patel, A J Sadoff; CLEO Collaboration

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

R Ammar et al. Phys Rev Lett. .

Abstract

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.

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