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First search for the weak radiative decays $$Lambda_c^+ to Sigma^+ gamma$$ and $$Xi_c^0 to Xi^0 gamma$$

Li, Y.*; 谷田 聖   ; Belle Collaboration*; 他187名*

Li, Y.*; Tanida, Kiyoshi; Belle Collaboration*; 187 of others*

We present the first search for the weak radiative decays $$Lambda_c^+ to Sigma^+ gamma$$ and $$Xi_c^0 to Xi^0 gamma$$ using a data sample of 980~fb$$^{-1}$$ collected by the Belle detector operating at the KEKB asymmetric-energy $$e^+e^-$$ collider. There are no evident $$Lambda_c^+ to Sigma^+ gamma$$ or $$Xi_c^0 to Xi^0 gamma$$ signals. Taking the decays $$Lambda_c^+ to p K^- pi^+$$ and $$Xi_c^0 to Xi^- pi^+$$ as normalization channels, the upper limits at 90% credibility level on the ratios of branching fractions $${cal B}(Lambda_c^+ to Sigma^+ gamma)/{cal B}(Lambda_c^+ to p K^{-} pi^+) < 4.0 times 10^{-3}$$ and $${cal B}(Xi_c^0 to Xi^0 gamma)/{cal B}(Xi_c^0 to Xi^- pi^+) < 1.2 times 10^{-2}$$ are determined. We obtain the upper limits at 90% credibility level on the absolute branching fractions $${cal B}(Lambda_c^+ to Sigma^+ gamma) < 2.6 times 10^{-4}$$ and $${cal B}(Xi_c^0 to Xi^0 gamma) < 1.8 times 10^{-4}$$.

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パーセンタイル:27.57

分野:Astronomy & Astrophysics

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