diff options
| -rw-r--r-- | chroma/generator/vertex.py | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/chroma/generator/vertex.py b/chroma/generator/vertex.py index 2a3bedf..513a961 100644 --- a/chroma/generator/vertex.py +++ b/chroma/generator/vertex.py @@ -59,7 +59,7 @@ def pi0_gun(pos_iter, dir_iter, ke_iter, t0_iter=constant(0.0), start_id=0, gamm # In rest frame theta_rest = np.arccos(gamma1_dir[2]) - phi_rest = np.arctan2(gamma1_dir[0], gamma1_dir[1]) + phi_rest = np.arctan2(gamma1_dir[1], gamma1_dir[0]) # In lab frame (gamma1_e, gamma1_dir), (gamma2_e, gamma2_dir) = \ |