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**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.

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