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I D meson decay and invariant mass

  1. May 10, 2017 #1
    Considering a D0->π+K- where the D meson decays from rest.

    If one was to want to calculate the invariant mass of the D meson by measuring the momenta of the pion and kaon, following from conservation of momentum:


    However by inputting numerical data

    As such, since p2 is some positive quantity it can only reduce the invariant mass, and as the D meson started at rest the invariant mass should be equal to the rest mass:


    Clearly there is a flaw in my understanding, I'm simply not sure where, and any help would be highly appreciated.
  2. jcsd
  3. May 10, 2017 #2


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    These are the masses of the pi and K, not their energies.
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