Discovery of a New Doubly Charmed Baryon at CERN's LHC

The LHCb experiment at CERN’s Large Hadron Collider (LHC) has announced the discovery of a new baryon composed of two charm quarks and one down quark, significantly increasing our understanding of the strong force that governs matter. This newly identified particle is four times heavier than a proton and represents the 80th hadron discovered by LHC experiments. The discovery was presented at the Moriond conference and marks the first new particle identified following the upgrades to the LHCb detector completed in 2023.

CERN’s LHCb Experiment Discovers New Particle with Two Charm QuarksLHCb Collaboration discovers new proton-like particle

This baryon, which is unstable and decays rapidly, provides a unique opportunity for physicists to test models of quantum chromodynamics (QCD), the theory that describes the strong force binding quarks into protons, neutrons, and other composite particles. The new particle's predicted lifetime is up to six times shorter than a previously discovered similar baryon, which consisted of two charm quarks and one up quark. This difference in quark composition significantly affects the particle's stability and observation challenges.

LHCb Collaboration discovers new proton-like particleCERN’s LHCb Experiment Discovers New Particle with Two Charm Quarks

The LHCb Collaboration confirmed the existence of this baryon with a statistical significance of 7 sigma, surpassing the 5 sigma threshold required for a formal discovery. Researchers analyzed data from proton-proton collisions recorded during the LHC’s third run to identify this particle. The process involved tracking the decay products of the short-lived baryon, a technique that has been essential in the identification of many hadrons.

CERN’s LHCb Experiment Discovers New Particle with Two Charm QuarksLHCb Collaboration discovers new proton-like particle

CERN Director-General Mark Thomson emphasized the importance of this discovery, stating, “This major result is a fantastic example of how LHCb’s unique capabilities play a vital role in the success of the LHC.” He noted that the findings set the stage for future advancements expected from the High-Luminosity LHC, which aims to enhance the experimental capabilities of the facility.

LHCb Collaboration discovers new proton-like particleCERN’s LHCb Experiment Discovers New Particle with Two Charm Quarks

While the discovery has been met with enthusiasm, some physicists express caution regarding the implications of the new findings. They argue that while the particle adds to the catalog of known hadrons, the complexities of quantum chromodynamics and the behavior of exotic hadrons like tetraquarks and pentaquarks remain challenging to fully comprehend.

CERN’s LHCb Experiment Discovers New Particle with Two Charm Quarks

• “This is the first new particle identified after the upgrades to the LHCb detector that were completed in 2023,” — Vincenzo Vagnoni, LHCb Spokesperson

CERN’s LHCb Experiment Discovers New Particle with Two Charm Quarks

• “This major result is a fantastic example of how LHCb’s unique capabilities play a vital role in the success of the LHC,” — Mark Thomson, CERN Director-General

LHCb Collaboration discovers new proton-like particle

The discovery of this new doubly charmed baryon not only enriches the existing catalog of hadrons but also provides critical data for testing theoretical models of the strong force. As researchers continue to explore the fundamental constituents of matter, this finding underscores the ongoing advancements in particle physics facilitated by CERN's cutting-edge technology.

CERN’s LHCb Experiment Discovers New Particle with Two Charm QuarksLHCb Collaboration discovers new proton-like particle