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CERN Scientists Discover Two New Subatomic Particles
Jan 17, 2015

Two new subatomic particles that could widen our understanding of the universe have been discovered by the scientists at CERN.

  • The collaboration for the LHCb experiment at CERN’s Large Hadron Collider discovered the two new particles belonging to the baryon family.

  • A baryon is a composite subatomic particle made up of three quarks.

  • The particles were predicted to exist by the quark model but had never been seen before.

  • A related particle was found by the CMS experiment at CERN in 2012. Like the well-known protons that the LHC accelerates, the new particles are baryons made from three quarks bound together by the strong force.

  • The types of quarks are different, though: the new particles both contain one beauty (b), one strange (s), and one down (d) quark.

  • Due to the heavyweight b quarks, they are more than six times as massive as the proton. But the particles are more than just the sum of their parts: their mass also depends on how they are configured.

  • As well as the masses of these particles, the research team studied their relative production rates, their widths (a measure of how unstable they are) and other details of their decays.

  • The results match up with predictions based on the theory of Quantum Chromodynamics (QCD).  QCD is part of the Standard Model of particle physics, the theory that describes the fundamental particles of matter, how they interact and the forces between them.


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