Measurements of branching fractions and asymmetry parameters of ?c0??K�?0 , ?c0??0 K�?0 , and ?c0??+ K?? decays

Abstract

Using a data sample of 980 fb?1 collected with the Belle detector at the KEKB asymmetric-energy e+e? collider, we study the processes of ?c0??K�?0, ?c0??0K�?0, and ?c0??+K?? for the first time. The relative branching ratios to the normalization mode of ?c0????+ are measured to beB(?c0??K�?0)/B(?c0????+)=0.18�0.02(stat.)�0.01(syst.),B(?c0??0K�?0)/B(?c0????+)=0.69�0.03(stat.)�0.03(syst.),B(?c0??+K??)/B(?c0????+)=0.34�0.06(stat.)�0.02(syst.), where the uncertainties are statistical and systematic, respectively. We obtainB(?c0??K�?0)=(3.3�0.3(stat.)�0.2(syst.)�1.0(ref.))�10?3,B(?c0??0K�?0)=(12.4�0.5(stat.)�0.5(syst.)�3.6(ref.))�10?3,B(?c0??+K?0)=(6.1�1.0(stat.)�0.4(syst.)�1.8(ref.))�10?3, where the uncertainties are statistical, systematic, and from B(?c0????+), respectively. The asymmetry parameters ?(?c0??K�?0) and ?(?c0??+K??) are 0.15 � 0.22(stat.) � 0.04(syst.) and ?0.52 � 0.30(stat.) � 0.02(syst.), respectively, where the uncertainties are statistical followed by systematic. [Figure not available: see fulltext.] � 2021, The Author(s).