Measurements of the properties of Lambda_c(2595), Lambda_c(2625), Sigma_c(2455), and Sigma_c(2520) baryons

TL;DR

This paper reports precise measurements of the masses and decay widths of several charmed baryons, using a large dataset from proton-antiproton collisions, improving the accuracy of known properties especially for excited Lambda_c+ states.

Contribution

It provides the most precise measurements to date of the resonance properties of Lambda_c(2595)+, Lambda_c(2625)+, Sigma_c(2455)++,0, and Sigma_c(2520)++,0 baryons, with significantly reduced uncertainties.

Findings

Measured masses and widths with high precision.

Achieved uncertainties comparable or smaller than world averages.

Enhanced understanding of charmed baryon properties.

Abstract

We report measurements of the resonance properties of Lambda_c(2595)+ and Lambda_c(2625)+ baryons in their decays to Lambda_c+ pi+ pi- as well as Sigma_c(2455)++,0 and Sigma_c(2520)++,0 baryons in their decays to Lambda_c+ pi+/- final states. These measurements are performed using data corresponding to 5.2/fb of integrated luminosity from ppbar collisions at sqrt(s) = 1.96 TeV, collected with the CDF II detector at the Fermilab Tevatron. Exploiting the largest available charmed baryon sample, we measure masses and decay widths with uncertainties comparable to the world averages for Sigma_c states, and significantly smaller uncertainties than the world averages for excited Lambda_c+ states.