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Related Experiment Video

Updated: May 28, 2026

Setting Limits on Supersymmetry Using Simplified Models

Setting Limits on Supersymmetry Using Simplified Models

Published on: November 15, 2013

Observation of the Ξ(b)(0) baryon.

T Aaltonen¹, B Álvarez González, S Amerio

¹Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki, Finland.

Physical Review Letters

|October 11, 2011

Summary

Researchers observed the bottom strange baryon, Xi(b)0, using data from proton-proton collisions. This discovery provides a new particle for the Standard Model and advances our understanding of baryon spectroscopy.

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Area of Science:

High Energy Physics
Particle Physics
Hadron Spectroscopy

Background:

The Standard Model of particle physics includes various baryons, which are composite particles made of three quarks.
Understanding the properties and spectrum of bottom baryons is crucial for testing Quantum Chromodynamics (QCD) and searching for new physics.

Purpose of the Study:

To report the first observation of the Ξ(b)0 baryon.
To measure the mass of the Ξ(b)0 baryon.
To observe the Ξ(b)- baryon.

Main Methods:

Analysis of data from proton-proton collisions at sqrt(s)=1.96 TeV.
Utilizing the Collider Detector at Fermilab (CDF) with an integrated luminosity of 4.2 fb^-1.
Reconstruction of the Ξ(b)0 via its decay chain Ξ(b)0 → Ξ(c)+π-, with subsequent decays Ξ(c)+ → Ξ-π+π+, Ξ- → Λπ-, and Λ → pπ-.

Main Results:

Observation of a significant signal for Ξ(b)0 with 25.3 candidates and a statistical significance of 6.8 standard deviations.
Precise measurement of the Ξ(b)0 mass: 5787.8 ± 5.0(stat) ± 1.3(syst) MeV/c^2.
Observation of the Ξ(b)- baryon through its decay channel Ξ(b)- → Ξ(c)0π-.

Conclusions:

The discovery of the Ξ(b)0 baryon expands the known spectrum of bottom baryons.
The measured mass provides a crucial data point for theoretical models of heavy baryon spectroscopy.
Further studies of Ξ(b)0 and Ξ(b)- properties can offer insights into the strong interaction.