Search for charmed baryons in the Λc⁺η system and measurement of the branching fractions of Λc(2880)⁺ and Λc(2940)⁺ decaying to Λc⁺η and pD⁰ relative to Σc(2455)π

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We search for excited charmed baryons in the Λc⁺η system using a data sample corresponding to an integrated luminosity of 980 fb⁻¹. The data were collected by the Belle detector at the KEKB e⁺e⁻$ asymmetric-energy collider. No significant signals are found in the $Λ_c^+η$ mass spectrum, including the known $Λ_c(2880)^+$ and $Λ_c(2940)^+$. Clear $Λ_c(2880)^+$ and $Λ_c(2940)^+$ signals are observed in the $pD^0$ mass spectrum. We set upper limits at 90% credibility level on ratios of branching fractions of $Λ_c(2880)^+$ and $Λ_c(2940)^+$ decaying to $Λ_c^+η$ relative to $Σ_c(2455)π$ of $<0.13$ for the $Λ_c(2880)^+$ and $<1.11$ for the $Λ_c(2940)^+$. We measure ratios of branching fractions of $Λ_c(2880)^+$ and $Λ_c(2940)^+$ decaying to $pD^0$ relative to $Σ_c(2455)π$ of $0.75 ± 0.03(stat.) ± 0.07(syst.)$ for the $Λ_c(2880)^+$ and $3.59 ± 0.21(stat.) ± 0.56(syst.)$ for the $Λ_c(2940)^+$.