Speaker
Felix Wick
(Karlsruhe)
Description
We present a study of the first orbital excitations of the Lambda_c baryon, the resonances Lambda_c(2595) and Lambda_c(2625), in the decay channel Lambda_c+ pi+ pi- as well as the Lambda_c spin excitations Sigma_c(2455) and Sigma_c(2520) in its decays to Lambda_c+ pi- and Lambda_c+ pi+ reconstructed in a sample corresponding to 5.3 fb^-1 of data collected by the CDF experiment. Exploiting the excellent CDF mass resolution we present measurements of the mass differences with respect to the Lambda_c and the decay widths of these states using significantly higher statistics than previous experiments. The lineshape modification of Lambda_c(2595) due to its dominant threshold decay to Sigma_c(2455) pi is properly taken into account.
