Measurement of the masses and widths of the bottom baryons Sigma_b+- and Sigma_b*+-

TL;DR

This paper reports improved measurements of the masses and first measurements of the natural widths of four bottom baryon resonance states using proton-antiproton collision data at 1.96 TeV from the CDF II detector.

Contribution

It provides the first measurements of the natural widths of Sigma_b and Sigma_b* baryons and improves mass measurements using a large dataset from the Fermilab Tevatron.

Findings

Measured masses of Sigma_b+-, Sigma_b*+- baryons.

First measurements of their natural widths.

Enhanced precision over previous results.

Abstract

Using data from proton - anti-proton collisions at the energy Ecm = 1.96 TeV recorded by the CDF II detector at the Fermilab Tevatron, we present improved measurements of the masses and first measurements of natural widths of the four bottom baryon resonance states Sigma_b+, Sigma_b*+ and Sigma_b-, Sigma_b*-. These states are fully reconstructed in their decay modes to Lambda_b pi+-, where Lambda_b -->Lambda_c+ pi- with Lambda_c+ -->prot K- pi+. The analysis is based on a data sample corresponding to an integrated luminosity of 6.0/fb collected by an online event selection based on tracks displaced from the proton - anti-proton interaction point.