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Are there exist distinguishable anti-gluon and anti of W-Z particles?

  1. Jul 2, 2012 #1
    Hi every body.
    Please forgive me if the question is not good,because in Vietnam I have to self-study Physics.
    I have not seen in any textbooks saying about anti-gluons and anti-particles of W-Z boson.So are there exist the anti-particles?And can we distinguish the differences between the particle and anti-particle bosons,because other photon,the boson particles have ''color charge''(gluons) and electric charge(W-Z)?
    Thank you very much for your kind heart.
     
  2. jcsd
  3. Jul 2, 2012 #2
    For a particle to have a distinct anti-particle he must have a conserved charge that changes under conjugation.

    The W boson has electric charge, which changes sign under conjugation. Thus,
    The [itex]W^{+}[/itex] is the antiparticle of the [itex]W^{-}[/itex]

    The Z boson has no such charges (It is electrically neutral) and thus its not antiparticle.

    For the gluons, it is true they have color.
    However, Their are 8 gluons.
    When You try to find the anitparticle of a particular gluon it turns out to lead to another gluon (or a combination of gluons). The mathematical term for this is they transform under a real representation. Thus the whole gluon octet ( all 8 of them) is its own anti-particle.

    Hope that helps, Ofir
     
  4. Jul 2, 2012 #3
    To elaborate a bit further concerning the Z boson: One should perhaps instead say that it is its own antiparticle, like the photon. There are electrically neutral particles with distinct antiparticles, for example the neutral mesons, so electric charge is not the only thing which determines if a particle has an antiparticle or not.
     
  5. Jul 2, 2012 #4
    So,there are not exist anti-Z boson?So the symmetry particle-antiparticle is broken?
     
  6. Jul 2, 2012 #5
    If anti-Z particle were not its own,what is anti-Z particle?
     
  7. Jul 2, 2012 #6
    The symmetry particle-antiparticle isn't broken( Well the symmetry isn't exact, but that isn't relevant for this)

    Simply, If you would construct identical world with every particle replaced by its antiparticle (which would behave the same) The Z would be replaced by itself. The Z boson wouldn't change, Just as a symmetric object would look excatly the same in the mirror (thats a different symmetry (parity), but it is analogous) .
     
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