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CERN Discovers New Proton-Like Particle with Two Charm Quarks
LHCb's upgraded detector enabled discovery of the Xicc+ baryon with over 7 sigma significance, confirming its mass and resolving a 20-year-old SELEX experimental discrepancy.
- CERN's LHCb experiment at CERN's Large Hadron Collider announced the discovery of a new baryon made of two charm quarks and one down quark, based on Run 3 data, with a significance above 7 sigma.
- After upgrades completed in 2023, LHCb detector enhancements enabled sensitive searches, following the 2017 Xicc++ discovery and resolving a 4.7 sigma 2002 SELEX discrepancy.
- Analysis of Run 3 proton–proton collisions shows the particle decays quickly, identified by decay-product reconstruction, with predicted lifetime up to six times shorter and total hadrons discovered by LHC experiments at 80.
- The result gives theorists new experimental data to test quantum chromodynamics and helps researchers study how the strong nuclear force binds heavier quarks inside baryons.
- The discovery provides data that positions the LHC for further studies, offering constraints for models of conventional baryons and exotic hadrons and emphasizing the need for detector sensitivity ahead of the High-Luminosity LHC.
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der Standard DEThe Baryon with two heavy charm quarks is only the second of its kind. It is intended to help to better understand the force that holds matter together in the innermost part
·Vienna, Austria
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This finding was made possible thanks to the improved LHCb detector, an important international project in which more than 1000 scientists from...
A new particle of structure similar to a proton was discovered at CERN. Four times heavier than this one, it consists of two charmed quarks and a quark down, the organization said Tuesday.
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