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Which elementary particle has the greatest rest mass? (For the sake of this question I'll call a photon's rest mass 0, whether it is or isn't [actually, tell me if this is the right thing to do]).

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    $\begingroup$ have you tried looking up elementary particles on wikipedia and looking at which has the largest number under "mass"? $\endgroup$ – Jim Apr 11 '14 at 17:20
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    $\begingroup$ en.wikipedia.org/wiki/… $\endgroup$ – Schrödinger's Cat Apr 11 '14 at 17:26
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    $\begingroup$ Well, given that the question does not specify Standard Model particle, there could be any of dozens of answers to this question. For example, it is postulated, and highly likely, that if indeed Supersymmetric particles exist, then there are heavier ones than the SM particles. These are just one class of many postulated particles. I think you need to be more specific in your question to get an answer. $\endgroup$ – Flint72 Apr 11 '14 at 20:22
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    $\begingroup$ This question appears to be off-topic because a quick Google search will give the answer. $\endgroup$ – jinawee Apr 12 '14 at 9:31
  • $\begingroup$ It turns out the answer to this question is a black hole. $\endgroup$ – Joshua Jan 25 '16 at 16:55
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http://www.quantumdiaries.org/2014/04/04/moriond-2014-new-results-new-explorations-but-no-new-physics/
Top quark mass has been revised upward.

enter image description here

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Top Quark, with a rest mass of approximately $\ 173.07 \space GeV/c^2$ .

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  • $\begingroup$ ok, is bottom quark the next heaviest then? $\endgroup$ – stanley dodds Apr 11 '14 at 17:20
  • $\begingroup$ en.wikipedia.org/wiki/… mass is number in top left of each box. GeV is larger than MeV. $\endgroup$ – Jim Apr 11 '14 at 17:22
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    $\begingroup$ @stanleydodds the Higgs Boson is the next heaviest fundamental particle in the standard model. $\endgroup$ – user44024 Apr 11 '14 at 17:24

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