Abstract:

Two narrow resonances were observed and confirmed by different experiments last year. The observations of the DsJ*(2317) and DsJ(2460) were surprising because they are narrower and less massive than most theoretical predictions for the L=1 c-sbar mesons for which these states would otherwise be obvious candidates. I will present experimental evidence from CLEO for the existence of these two states -- this involved untangling the pathological background that each state constitutes for the other. I will also discuss their properties and interpretations as cs-bar mesons, as well as other theoretical explanations.