Interaction of particles

  1. Hi people,
    I have one question, leptons and quarks are electromagnetically charged particles. Is there an electromagnetic interaction between them?
    Thank you for the help!
  2. jcsd
  3. Drakkith

    Staff: Mentor

    Of course. That's how electrons and protons stay bound to each other in atoms.
  4. Thank you, electrons and protons stay bound to each other in atoms because they have an integer charge but quarks have a fractional charge how they interact with leptons?
  5. Bill_K

    Bill_K 4,157
    Science Advisor

    Charges with opposite sign attract, and charges with the same sign repel. It has nothing to do with whether they are integer charges or not.
  6. According to the strong interaction, we can never see free quark, so how can the electron interact with up-quark or down quark? thank you for the response!
  7. Drakkith

    Staff: Mentor

    Why wouldn't it be able to? A free quark just means a quark that isn't bound together with another quark. There's still three quarks making up each proton.
  8. ZapperZ

    ZapperZ 30,744
    Staff Emeritus
    Science Advisor
    Education Advisor

    Your series of question here raised a question with me regarding your thought process, that I just had to ask.

    First, you asked if there's any electromagnetic interaction between quarks and leptons. Presumably, you have no problem with knowing that there is an electromagnetic interaction between protons and electrons, ya?

    So, naturally, I puzzle over why there is a problem with accepting that there is an electromagnetic interaction between quarks and leptons. After all, a proton is made up of 3 quarks. So if proton-electron has EM interaction, why do you have a problem with quark-lepton? having EM interaction?

    Secondly, why would "strong interaction" matter on whether there is EM interaction between quark-lepton, which was your original question? It is not an either-or situation. The strong interaction only matters between quark-quark (or any hadrons). It doesn't significantly affect the EM interaction between quark-lepton. So I am puzzled why this matters. Does the fact that my charged Van de Graaf generator is on the earth, in the gravitational field, significantly affects its EM field when compared to having it float in space when there's less gravitational field?

  9. clem

    clem 1,276
    Science Advisor

    The EM interaction is long range, so it doesn't matter where the quark is.
  10. Thank you.
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