Measurement of b-Baryons with the CDF II detector

TL;DR

This paper reports the discovery of new bottom baryon states, including the \\Xi_b^- and \\Sigma_b^{(*)} resonances, with measurements aligning with theoretical predictions, using data from the CDF II detector.

Contribution

First observation of the \\Xi_b^- baryon and four \\Sigma_b^{(*)} resonances, providing experimental confirmation of predicted bottom baryon states.

Findings

^- baryon observed with 7.7 sigma significance

Mass of \\Xi_b^- measured to be 5792.9 MeV/c^2

Four \\Sigma_b^{(*)} resonances observed

Abstract

We report the observation of new bottom baryon states. The most recent result is the observation of the baryon \Xi_b^- through the decay \Xi_b^- to J/\psi \Xi^-. The significance of the signal corresponds to 7.7 sigma and the \Xi_b^- mass is measured to be 5792.9 \pm 2.5(stat.) \pm 1.7(syst.) MeV/c^2. In addition we observe four resonances in the \Lambda_b^0 \pi^{\pm} spectra, consistent with the bottom baryons \Sigma_b^{(*)\pm}. All observations are in agreement with theoretical expectations.