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Homework Help: Angle between products of decay

  1. Mar 31, 2008 #1
    1. The problem statement, all variables and given/known data
    Meson B+ decays at J/ψ and K+.
    we know the masses of the particles and we are looking for the angle between the products when B+ has a momentum of 5GeV in lab frame.

    2. Relevant equations

    3. The attempt at a solution
    i found the momentum and energies at cm frame (easy..)
    then i assumed that B+ is mooving at x axes (in lab)
    i analized momentums of products (both in cm and lab) in x axes to use the Lorentz transformations

    Lorentz: qxL=γ(q*cosθ+uE*)
    so tanΘL=qyL/qxL

    how can i find the angle θ ???

    do i miss something? i think i don't have enough data.
    Last edited: Apr 1, 2008
  2. jcsd
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