Measurement of Natural Widths of Sigma-c-0 and Sigma-c-++ Baryons

TL;DR

This paper reports precise measurements of the natural decay widths of the Sigma_c^0 and Sigma_c^{++} baryons using data from the FOCUS experiment, providing valuable experimental data for theoretical models.

Contribution

First measurement of the natural widths of Sigma_c^0 and Sigma_c^{++} baryons using FOCUS data, with detailed statistical and systematic analysis.

Findings

Measured widths: Sigma_c^0 = 1.55 MeV/c^2, Sigma_c^{++} = 2.05 MeV/c^2

Results compared with recent theoretical predictions

Sample sizes: 913 Sigma_c^0 and 1110 Sigma_c^{++} decays

Abstract

In this paper we present a measurement of the natural widths of $\Sigma_c^0$ and $\Sigma_c^{++}$. Using data from the FOCUS experiment, we find $\Gamma(\Sigma_c^0) = 1.55 +0.41/-0.37 \pm 0.38$ MeV/c^2 and $\Gamma(\Sigma_c^0) = 2.05 +0.41/-0.38 \pm 0.38$ MeV/c^2. The first errors are statistical, the second systematic. These results are obtained with a sample of 913 $\Sigma_c^0 \to \Lambda_c^+ \pi^-$ decays and 1110 $\Sigma_c^++ \to \Lambda_c^+ \pi^+$ decays. These results are compared with recent theoretical predictions. PACS numbers: 14.20.Lq 13.30Eg