Before I begin, I would like to say what I am about to ask would require some sort of top-top-bottom bound state for it to function. Which (to my knowledge) has not been experimentally or theoretically predicted. Also, in case if you are wondering- no, this is not a homework question. --- So, if we know that hydrogen exists, could we also hypothetically observe some sort of hydrogen-like state where there would be second generation quarks (charm and strange) or third generation quarks (top and bottom/truth and beauty) bound in a proton like state; with a muon or tau-lepton acting like an electron?* * Yes, I am aware of positronium bound states and exotic atoms (Introduction to Elementary Particles, Griffiths, page 169).