Measurement of $B$ Baryon Properties at CDF

TL;DR

This paper reports precise measurements of the masses and lifetimes of several $b$-baryons using data from proton-antiproton collisions, providing new insights into heavy baryon properties and evidence for a rare decay process.

Contribution

First measurements of $b$-baryon masses and lifetimes using large data set, including evidence for $ ext{Omega}_b^-$ decay, improving upon previous results.

Findings

Measured masses and lifetimes of $ ext{Lambda}_b$, $ ext{Xi}_b^-$, $ ext{Xi}_b^0$, and $ ext{Omega}_b^-$.

Provided first evidence for $ ext{Omega}_b^- ightarrow ext{Omega}_c^0 \, ext{pi}^-$ decay.

Results supersede previous measurements.

Abstract

We report on mass and mean life measurements of several ground state $b-$baryons, using 9.6 $\textrm{fb}^{-1}$ of data from $p\bar p$ collisions at $\sqrt{s}=1.96$ TeV, and recorded with the Collider Detector at Fermilab. Data collected with triggers designed to collect events with $J/\psi \rightarrow \mu^+ \, \mu^-$ candidates and events with hadrons displaced from the beamline are used to measure the masses and lifetimes of $\Lambda_b, \Xi_b^-, \Xi_b^0$, and $\Omega_b^-$. The first evidence for the process $\Omega_b^- \rightarrow \Omega_c^0 \, \pi^-$ is also shown. The results supersede our previous measurements of these quantities.