Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Why t3 , t8 plane ?

  1. Aug 27, 2005 #1
    in sampling about the flavor u,d,s ...we use the t3, t8 generators amd plot all the possible combinations of their eigen values ....and then define u ,d , s....
    i want 2 ask that why specifically these 2 SU(3) generators are used t o
    define flavors?
    I have vague answers 2 this question but m not satisfied with those ....
    plz help me !
  2. jcsd
  3. Aug 28, 2005 #2


    User Avatar
    Science Advisor

    You posed a bit of a vague question, you might want to reformulate it.

    But I think the answer you are looking for is that that the up and down quark are much better symmetry partners (to a great approximation they are eigenstates of isospin symmetry, which the mass of the strange quark spontaneously breaks).
  4. Aug 28, 2005 #3


    User Avatar
    Gold Member

    Why the "..."? For SU(3) flavour you can define u,d,s, and nothing more. If you want to build u,d,s,c you need SU(4) and so on. If you only want to use u,d you are happy with SU(2).

    It seems sensible to choose generators (mesons) in a way that the inclusion SU(2) < SU(3) < SU(4) <... is explicit, but I am not sure if practicioners can use this rationale.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook