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Homework Help: Particle Physics

  1. Nov 30, 2008 #1
    1. The problem statement, all variables and given/known data


    1]Neutral pion decays into 2 photons which then decay into electron-positron pairs.

    What would the feynman diagram look like?

    2] Why is this decay of the neutral pion difficult to identify in bumble chambers?

    2. Relevant equations

    feynman diagram

    3. The attempt at a solution

    1]neutral pion enters feynman diagram with arrow point in, then separating into 2 photons show by squiggly lines. both of these photons then separate creatin the electron-positron annihilation shown by e- meeting the photon and e+ meeting the photon ???

    2]hard to detect as photons are invisible and only show up when interacting with as particle and can have gaps between their interactions like with the electron-positron shown here

  2. jcsd
  3. Nov 30, 2008 #2


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    Science Advisor
    Homework Helper

    1. Yes, this is also called "Pion double dalitz decay"

    http://www-he.scphys.kyoto-u.ac.jp/colloquium/trape/FY2008/081121_maeda.pdf [Broken]

    slide 13

    2. WHY are the photons "invinsible" in bubble chambers? Think which particles that make tracks in bubble chambers and what property they posess.
    Last edited by a moderator: May 3, 2017
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