Studies of charmed strange baryons in the ?d final state at Belle

Abstract

We report the discovery of ?c(3055)0, observed by its decay into the final-state ?D0, and present the first observation and evidence of the decays of ?c(3055)+ and ?c(3080)+ into ?D+. We also perform a combined analysis of the ?D+ with the ?c++K- and ?c?++K- decay modes to measure the ratios of branching fractions, masses and widths with improved accuracy. We measure the ratios of branching fractions B(?c(3055)+??D+)/B(?c(3055)+??c++K-)=5.09�1.01�0.76, B(?c(3080)+??D+)/B(?c(3080)+??c++K-)=1.29�0.30�0.15, and B(?c(3080)+??c?++K-)/B(?c(3080)+??c++K-)=1.07�0.27�0.04, where the uncertainties are statistical and systematic. The analysis is performed using a 980 fb-1 data sample collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. � 2016 American Physical Society.