fix how the RMS scattering angle is calculated

The RMS scattering angle calculation comes from Equation 33.15 in the PDG
article on the passage of particles through matter. It's not entirely obvious
if this equation is correct for a long track. It seems like it should be
integrated along the track to add up the contributions at different energies,
but it's not obvious how to do that with the log term.

In any case, the way I was previously calculating it (by using the momentum and
velocity at each point along the track) was definitely wrong.

I will try this out and perhaps try to integrate it later.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/muon.h b/src/muon.h
index a592591..e95cb3c 100644
--- a/src/muon.h
+++ b/src/muon.h
@@ -6,6 +6,6 @@
 double get_range(double T, double rho);
 double get_T(double T0, double x, double rho);
 double get_dEdx(double T, double rho);
-double get_expected_charge(double x, double T, double *pos, double *dir, double *pmt_pos, double *pmt_normal, double r);
+double get_expected_charge(double x, double T, double T0, double *pos, double *dir, double *pmt_pos, double *pmt_normal, double r);
 
 #endif