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Angle between products of decay

  • Thread starter estrella
  • Start date
6
0
1. Homework Statement
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. Homework 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

qx=q*cosθ
qy=q*sinθ
Lorentz: qxL=γ(q*cosθ+uE*)
qyL=q*sinθ
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:

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