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B Question on Kaons and its strangeness

  1. Mar 20, 2016 #1
    What is the property of Kaon that make it a strange particle. Other than it takes long to decay but this is same for pion, then why dont we call it a strange particle?

    And also what is the exchange particle for strong nuclear force. I thought it Pion, but it is gluon.
    Last edited: Mar 20, 2016
  2. jcsd
  3. Mar 20, 2016 #2


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    Staff: Mentor

    The pion cannot decay via the strong interaction because it is the lightest hadron, so its long lifetime was well understood. The kaon can decay to pions, so its long lifetime was strange.
    The gluon is the fundamental exchange particle, but if you want to consider the effective force between (color-neutral) nucleons in a nucleus, pion exchange is a better model.
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