Measurement of the branching fraction of Xi 0c -> Lambda c plus pi- at Belle

Abstract

Based on a data sample of 983 fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider, we present the study of the heavy-flavor-conserving decay Ξc0→Λc+π- with Λc+ reconstructed via its pK-π+ decay mode. The branching fraction ratio B(Ξc0→Λc+π-)/B(Ξc0→Ξ-π+) is measured to be 0.38±0.04±0.04. Combining with the world average value of B(Ξc0→Ξ-π+), the branching fraction B(Ξc0→Λc+π-) is deduced to be (0.54±0.05±0.05±0.12)%. Here, the uncertainties above are statistical, systematic, and from B(Ξc0→Ξ-π+), respectively.