deletions | additions       diff --git a/kinematics_angle.tex b/kinematics_angle.tex  index 32eda3a..1c1eb78 100644  --- a/kinematics_angle.tex  +++ b/kinematics_angle.tex 
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& \tan \theta \approx \frac{E_{\nu}' \sin \theta'}{E_{\nu}} \\  \implies & \sin \theta' \approx \frac{E_{\nu}}{E_{\nu}'} \tan \theta  \end{split}  \end{equation} According to \cite{McDonald_2001} since the pion is a spin zero particle, the decay is isotropic in the pion rest frame. Therefore, the volume elements can be seen as concentric cylinders to integrate over. In order to calculate the neutrino flux to be measured at a given angle, we need to know $\frac{\partial E_{\pi}}{\partial \cos \theta}$