Heavy Baryons and Exotics Spectrum

TL;DR

This paper reviews precise theoretical predictions for heavy baryon masses containing b quarks, confirms recent experimental findings, and explores exotic states like Z_b resonances and potential dibaryons such as the 'beauteron' with implications for hadron spectroscopy.

Contribution

It provides new theoretical mass predictions for heavy baryons, discusses recent experimental confirmations, and explores the existence of exotic tetraquark and dibaryon states.

Findings

Confirmation of theoretical mass predictions by experimental data

Identification of Z_b resonances as tetraquark states

Proposal of a Sigma_b Sigma_b dibaryon, the 'beauteron'

Abstract

We discuss several highly accurate theoretical predictions for masses of baryons containing the b quark which have been recently confirmed by experimental data. Several predictions are given for additional properties of heavy baryons. We also discuss the two charged exotic resonances Z_b with quantum numbers of a (b bbar u ddbar) tetraquark, very recently reported by Belle in the channel [Upsilon(nS) \pi^+, n=1,2,3]. Among possible implications are deeply bound I=0 counterparts of the Z_b-s and existence of a Sigma_b^+ Sigma_b^- dibaryon, a "beauteron".