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Observation of two narrow states decaying into Xi(+)(c)gamma and Xi(0)(c)gamma
Ammar, Raymond G. Baringer, Philip S. Bean, Alice Besson, David Zeke Coppage, Don Davis, Robin E. P. Kotov, S. Kravchenko, I. Kwak, Nowhan Zhou, L.
Ammar, Raymond G.
Baringer, Philip S.
Bean, Alice
Besson, David Zeke
Coppage, Don
Davis, Robin E. P.
Kotov, S.
Kravchenko, I.
Kwak, Nowhan
Zhou, L.
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Abstract
We report the first observation of two narrow charmed strange baryons decaying to Xi(c)(+) gamma and Xi(c)(0)gamma, respectively, using data from the CLEO II detector at the Cornell Electron Storage Ring. We interpret the observed signals as the Xi(c)(+/) (c{su}) and Xi(c)(0/) (c{sd}), the symmetric partners of the well-established antisymmetric Xi(c)(+) (c[su]) and Xi(c)(0) (c[sd]). The mass differences M(Xi(c)(+/)) - M(Xi(c)(+)) and M(Xi(c)(0/)) - M(Xi(c)(0)) have been measured to be 107.8 +/- 1.7 +/- 2.5 and 107.0 +/- 1.4 +/- 2.5 MeV/c(2), respectively. [S0031-9007(98)08253-2].
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Date
1999-01
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AMERICAN PHYSICAL SOC
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p492_1.pdf
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Jessop, CP, Lingel, K, et al. Observation of two narrow states decaying into Xi(+)(c)gamma and Xi(0)(c)gamma. PHYSICAL REVIEW LETTERS. January 1999. 82(3) : 492-496