Curious layman Posted July 8, 2020 Share Posted July 8, 2020 A newly discovered four-quark particle (illustrated) is the first to contain all heavy quarks, and more than two quarks of the same kind. CERN Quote Physicists think they have detected the first conglomerate of four quarks incorporating more than two of the same kind. This tetraquark contains four quarks of the charm variety: two charm quarks and their antimatter counterparts, called anticharm quarks, researchers report online at arXiv.org on June 30. https://www.sciencenews.org/article/new-particle-cern-tetraquark-first-four-same-kind-quark 2 Link to comment Share on other sites More sharing options...
paulsutton Posted August 2, 2020 Share Posted August 2, 2020 How does matter and counterpart anti matter exist within the same space inside a particle without Annihilation ? Link to comment Share on other sites More sharing options...
swansont Posted August 2, 2020 Share Posted August 2, 2020 1 hour ago, paulsutton said: How does matter and counterpart anti matter exist within the same space inside a particle without Annihilation ? They do annihilate. Particle/antiparticle pairs can form bound states before doing so. Electrons and positrons form positronium, only annihilating after they’s dropped into the ground state. The article says this particle could be a loosely bound pair of mesons. The J/psi (charm/anticharm), which is what it decays into, has a lifetime less than 10^-20 seconds 1 Link to comment Share on other sites More sharing options...
paulsutton Posted August 2, 2020 Share Posted August 2, 2020 2 hours ago, swansont said: They do annihilate. Particle/antiparticle pairs can form bound states before doing so. Electrons and positrons form positronium, only annihilating after they’s dropped into the ground state. The article says this particle could be a loosely bound pair of mesons. The J/psi (charm/anticharm), which is what it decays into, has a lifetime less than 10^-20 seconds Great, thanks for this, sounds like a really interesting development. Paul Link to comment Share on other sites More sharing options...
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