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Evidence for Lambda(c)(2593)(+) production
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DOI：10.1016/S0370-2693(97)00503-0.png)
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Abstract
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Using the ARGUS detector at the e(+)e(-) storage ring DORIS II at DESY, we have found evidence for the production of the excited charmed baryon state Lambda c(2593)(+) in the channel Lambda(c)(+)pi(+)pi(-). Its mass was determined to be (2594.6 +/- 0.9 +/- 0.4) MeV/c(2), and the natural width measured to be Gamma = (2.9(-2.1-1.4)(+2.9+1.8)) MeV. The production cross section times thebranching ratios of sigma(e(+)e(-) --> Lambda(c)(2593)X+) x Br(Lambda(c)(2593(+)) --> Lambda(c)(+)pi(+)pi(-) ) x Br(Lambda(c)(+) --> pK(-)pi(+)) was measured to be (0.25(-0.13)(+0.24) +/- 0.13) pb. The fractions of Lambda(c)(2593)(+) decays proceeding through the Sigma(c)(0) pi(+) and Sigma(c)(++)pi(-) channels were determined to be 0.29 +/- 0.10 +/- 0.11 and 0.37 +/- 0.12 +/- 0.13, respectively. (C) 1997 Published by Elsevier Science B.V.
Keywords:
QUARK-MODEL
CHARMED BARYON
SYMMETRY
STATE
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