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

QCD, a part of standard model?

  1. Aug 23, 2006 #1
    How is it not an exactly accurate understanding that QCD is a part/sector of the standard model of particle physics ? Or, it actually is?
  2. jcsd
  3. Aug 23, 2006 #2


    User Avatar
    Staff Emeritus
    Gold Member
    Dearly Missed

    It is. Quarks feel both the elecromagnetic force (they're electrically charged) and the weak force (they change identities, manifesting weak decay, and emitting both weak bosons and leptons), and the Salam-Weinberg unified Electroweak force therefore acts on them. Because these events are weak compared to the strong (color) force, it is sometimes permissible and possible to consider the QCD model, or even its first flavor (up and down quarks and their antiparticles) in isolation, but this is in no way intended to imply that for example, beta decay doesn't exist!
  4. Aug 29, 2006 #3


    User Avatar
    Gold Member

    Moreover, the experimental fitting of scattering amplitudes gets its right value if we have a multiplicity three for the quarks. So definitively SU(3) is included in the standard model.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook