Measurement of the Masses and Widths of the Sigma_c^++ and Sigma_c^0 Charmed Baryons

TL;DR

This paper reports precise measurements of the masses and first intrinsic width measurements of the Sigma_c^{++} and Sigma_c^0 charmed baryons using data from the CLEO detector, providing new insights into their properties.

Contribution

It provides the first measurements of the intrinsic widths of Sigma_c^{++} and Sigma_c^0 baryons and refines their mass differences relative to Lambda_c^+.

Findings

Mass difference of Sigma_c^{++} and Lambda_c^+ is 167.4 MeV

Mass difference of Sigma_c^0 and Lambda_c^+ is 167.2 MeV

Measured widths are approximately 2.3 and 2.5 MeV

Abstract

Using data recorded by the CLEO II and CLEO II.V detector configurations at CESR, we report new measurements of the masses of the Sigma_c^{++} and Sigma_c^0 charmed baryons, and the first measurements of their intrinsic widths. We find M(Sigma_c^{++}) - M(Lambda_c^+) = 167.4 +- 0.1 +- 0.2 MeV, Gamma(Sigma_c^{++}) = 2.3 +- 0.2 +- 0.3 MeV, and M(Sigma_c^0) - M(Lambda_c^+) = 167.2 +- 0.1 +- 0.2 MeV, Gamma(Sigma_c^0) = 2.5 +- 0.2 +- 0.3 MeV, where the uncertainties are statistical and systematic, respectively.