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

How can e-e+ possibly go to ZZ?

  1. May 24, 2015 #1
    Hi there, my question is the following.

    If an electron and positron annihilate, how can they result in ZZ?

    The issue i'm having is that due to charge conservation, the exhange particle can't be W- or W+.
    It also can't be a photon since the Z's don't have electrical charge to couple to.
    It also can't be a Z since the Z's don't have weak charge to couple to.

    I'm reading in my notes that a photon or a Z boson can mediate this interaction. How is that possible?

    Thanks for any replies.
     
  2. jcsd
  3. May 24, 2015 #2

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    It can work in the same way the annihilation to two photons works. No need to have the two Z interact with each other.
    The first two diagrams here - the third is not possible in the SM. The diagrams are for quarks but leptons work the same way.
     
  4. May 24, 2015 #3

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    The process goes by a t-channel electron.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook