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Homework Help: Subatomic rotations in a plane Abelian group

  1. Nov 14, 2007 #1
    1. The problem statement, all variables and given/known data
    5. The Z boson has a width of 2.4952 GeV:
    a. The Z decays 3.363% of the time in e+e-calculate the partial width of
    [tex]Z \rightarrow e+e-[/tex].
    b. The
    [tex]J/ \psi[/tex] (A cc bar state) has a width of 93.4 KeV. Is its lifetime is longer or shorter than the Z lifetime? Explain.
    c. Calculate the
    [tex]J/ \psi[/tex] lifetimes.

    2. Relevant equations
    None given.

    3. The attempt at a solution

    (a) I think: 2.4952/100*3.363=0.084GeV is correct but I'm not sure why?

    (b) I figure a bigger E means a smaller t, so it would be longer, but again I'm not sure of the physics...

    (c) I have no idea how to start... does
    [tex]J/ \psi[/tex] lifetimes have another more google friendly search name?

  2. jcsd
  3. Nov 14, 2007 #2
    Whoops, I typed in the wrong title and now can't work out how to change it...sorry!
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