Question: Does anyone know whether this can happen where two different particles can submerge into each other and create a bigger particle consequently making something new that we haven't seen before?
This is pretty much what we try to do in particle physics, particularly in colliders (like the LHC at CERN). We take “ordinary” subatomic particles like electrons and protons, accelerate them to almost the speed of light, and then smash them into each other. According to relativity, all of the kinetic energy of the colliding particles can go into making mass (E=mc2) and this could be in the form of new, really massive particles. Notice that the new particles don’t have to contain any trace at all of the original particles!
For example, in 2012 at the LHC we showed that you can take two gluons (massless particles that carry the strong force that holds the quarks together inside protons) and collide them to produce a Higgs boson – a completely new, particle that had never been seen before. The Higgs boson does not contain the gluons in any sense (it may be truly fundamental) and has a mass similar to a silver atom!!
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