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Why some particles have no mass even similar sized ones??

  1. Sep 24, 2015 #1
    Photon have the same size as an electron(i think) but no mass. Gluons also. WHY
  2. jcsd
  3. Sep 24, 2015 #2
    I meant gluons have no mass not same size
  4. Sep 24, 2015 #3


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    Photons are not the same size as electrons. Technically, assigning a size to either particle is very problematic. Both are considered to be point-particles, which means they are considered to be of 'zero size', but in reality quantum effects tend to smear out the position of either particle based on their wavelength/mass.

    That would require a very complicated mathematical description of Quantum Electrodynamics and the Higgs Field. The simple answer is that electrons simply have mass, and photons don't.
    Last edited: Sep 24, 2015
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