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Determining a mediating force of an Interaction

  1. Feb 21, 2012 #1
    What kind of force mediates the reaction:

    K- + alpha(ppnn) -> pi- + "hypernucleus"(ppn lambda)
    s(u) + (uud + uud + udd + udd) -> d(u) + (uud + uud + udd + uds)
    (u) is anti u

    We need to explain which force mediates this reaction.

    I am pretty sure it does not involve the weak force because there is no flavor change of any quarks, they are just rearranged. I am leaning towards the strong force because the interaction involves nucleons although I know that is a bad argument. Is there a change in isospin? In what interactions is isospin conserved and what interaction allow a change in isospin?

    So I am leaning towards strong interaction but I really have no reason to support this
  2. jcsd
  3. Feb 22, 2012 #2


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    Science Advisor

    Since the reaction involves quarks being rearranged it has to be the strong force.
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