Angle between products of decay

[estrella]

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.

Homework Equations

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.

 

[Jhero]

Hello, it seems like you are on the right track with using Lorentz transformations to find the angle between the products in the lab frame. However, you will need to use the conservation of momentum and energy equations to solve for the missing data. Additionally, you may need to use trigonometric identities to relate the momentum components in the lab frame to the momentum components in the center of mass frame. I suggest reviewing these concepts and equations to help you find the missing angle. Good luck!