A joint research group of RIKEN and Kyoto University theoretically predicted the existence of a new particle "Diomega (ΩΩ)" using the supercomputer "K computer".It is hoped that the fundamental problem of modern physics, which is how the quarks of elementary particles are combined to form a substance, will be clarified.

 All matter is made up of elementary particles called quarks and leptons (electrons, neutrinos, etc.), and particles made up of three quarks, such as protons, neutrinos, and omega (Ω) particles, are collectively called "baryons". ..A nucleus is a collection of multiple baryons, and in particular, the simplest nucleus consisting of two baryons (six quarks) is called a "dibaryon".Many baryons have been found, but no dibaryons have been found except for deuterons (one proton and one neutron).

 The joint research group succeeded in exponentially reducing the numerical calculation error using a new method.We have also extended the theory so that we can calculate the forces acting between baryons such as Ω particles in addition to protons and neutrons.In addition, we have developed a unique numerical calculation algorithm that can calculate the motion of intricately intertwined quarks at high speed, enabling large-scale numerical simulation.In this way, using RIKEN's supercomputer "K computer" etc., it took about 3 years to calculate the force acting between baryons in the real world for the first time.

 As a result, the force acting between the two Ω particles is clarified, and it is possible that the two Ω particles are weakly bound and move far apart in space, that is, the new particle diomega, similar to deuterons. Was shown to exist.In the future, we can expect new discoveries of dibaryons for the first time in about a century since the discovery of heavy protons through heavy ion collision experiments conducted all over the world.

Paper information:[Physical Review Letters] Most Strange Dibaryon from Lattice QCD

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