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