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This is the first known particle with four of the same kind of quark

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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

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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

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How does matter and counterpart anti matter exist within the same space inside a particle without Annihilation ?

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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

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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

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