pub fn cos_theta_cdf(e_ev: f64, e_after_ev: f64, mu: f64) -> f64
The cumulative distribution F(μ) of μ = cos θ under Ding et al. (2021) Eq. (16) for a phonon event E -> E' (the inverse of sample_cos_theta).
F(μ)
μ = cos θ
E -> E'
sample_cos_theta