With the discovery of the Higgs boson, the Standard Model is now complete. Can we be sure there isn't another generation of particles out there?
Share to linkedinthe left three columns ; the bosons populate the right two columns. If a speculative idea like mirror-matter is correct, there may be a mirror-matter counterpart for each of these particles.
Particle families appear as a set of 3, characterised by the electron, muon and tau families. The last 2 being unstable and decaying. So my question is: Is it possible that higher order particles exist? And if so, what energies might such particles be found? If not, how do we know that they don't exist.The particles and antiparticles of the Standard Model have now all been directly detected, with thelast holdout, the Higgs Boson, falling at the LHC earlier this decade.
A four-muon candidate event in the ATLAS detector at the Large Hadron Collider. The muon/anti-muon tracks are highlighted in red, as the long-lived muons travel farther than any other unstable particle. The energies achieved by the LHC are sufficient for creating Higgs bosons; previous electron-positron colliders could not achieve the necessary energies.For some reason, there are three copies, or generations, of fermionic particles that show up in the Standard Model.
As long as it's energetically allowed and not forbidden by any of the other quantum rules or symmetries that exist in our Universe, the heavier particles will always decay in this fashion. The big question, though, of why there are three generations, is driven not by theoretical motivations, but by experimental results.... [+]
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