Charm baryon spectroscopy at CDF

TL;DR

This paper reports precise measurements of the masses and decay widths of excited charm baryons, specifically the Lambdac and Sigmac states, using high-resolution data from the CDF experiment at the Tevatron.

Contribution

First detailed spectroscopic analysis of Lambdac and Sigmac excitations at CDF with significantly improved statistics and measurement precision.

Findings

Measured mass differences with respect to Lambdac

Determined decay widths of Lambdac excitations

Provided higher-precision data than previous experiments

Abstract

Due to an excellent mass resolution and a large amount of available data, the CDF experiment, located at the Tevatron proton-antiproton accelerator, allows the precise measurement of spectroscopic properties, like mass and decay width, of a variety of states. This was exploited to examine the first orbital excitations of the Lambdac baryon, the resonances Lambdac(2595) and Lambdac(2625), in the decay channel Lambdac+ pi+ pi-, as well as the Lambdac spin excitations Sigmac(2455) and Sigmac(2520) in its decays to Lambdac+ pi- and Lambdac+ pi+ final states in a data sample corresponding to an integrated luminosity of 5.2 invfb. We present measurements of the mass differences with respect to the Lambdac and the decay widths of these states, using significantly higher statistics than previous experiments.