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Study of electromagnetic decays of orbitally excited $$Xi_c$$ Baryons

Yelton, J.*; Tanida, Kiyoshi  ; Belle Collaboration*; 208 of others*

Using 980 fb$$^{-1}$$ of data collected with the Belle detector operating at the KEKB asymmetric-energy $$e^+e^-$$ collider, we report a study of the electromagnetic decays of excited ${charmed baryons}$ $$Xi_c(2790)$$ and $$Xi_c(2815)$$. A clear signal (8.6 standard deviations) is observed for $$Xi_c(2815)^0 to Xi_c^0gamma$$, and we measure: $$B[Xi_c(2815)^0 to Xi_c^0gamma]/B[Xi_c(2815)^0 to Xi_c(2645)^+pi^- to Xi_c^0pi^+pi^-] = 0.41 pm 0.05 pm 0.03$$. We also present evidence (3.8 standard deviations) for the similar decay of the $$Xi_c(2790)^0$$ and measure: $$B[Xi_c(2790)^{0}toXi_c^{0}gamma]/B[Xi_c(2790)^0toXi_c^{prime +}pi^{-}toXi_c^{+}gamma pi^-] = 0.13 pm 0.03 pm 0.02$$. The first quoted uncertainties are statistical and the second systematic. We find no hint of the analogous decays of the $$Xi_c(2815)^+$$ and $$Xi_c(2790)^+$$ baryons and set upper limits at the 90% confidence level of: $$B[Xi_c(2815)^{+}toXi_c^{+}gamma]/B[Xi_c(2815)^+toXi_c(2645)^0pi^+toXi_c^+pi^-pi^+] < 0.09,$$ and $$B[Xi_c(2790)^{+}toXi_c^{+}gamma]/B[Xi_c(2790)^+toXi_c^{prime0}pi^{+}toXi_c^{0}gamma pi^+] < 0.06.$$ Approximate values of the partial widths of the decays are extracted, which can be used to discriminate between models of the underlying quark structure of these excited states.

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