From 8447870e721dd738bce12b45e732c9cc01dc2595 Mon Sep 17 00:00:00 2001 From: tlatorre Date: Sun, 11 Nov 2018 13:22:18 -0600 Subject: update likelihood function to fit electrons! To characterize the angular distribution of photons from an electromagnetic shower I came up with the following functional form: f(cos_theta) ~ exp(-abs(cos_theta-mu)^alpha/beta) and fit this to data simulated using RAT-PAC at several different energies. I then fit the alpha and beta coefficients as a function of energy to the functional form: alpha = c0 + c1/log(c2*T0 + c3) beta = c0 + c1/log(c2*T0 + c3). where T0 is the initial energy of the electron in MeV and c0, c1, c2, and c3 are parameters which I fit. The longitudinal distribution of the photons generated from an electromagnetic shower is described by a gamma distribution: f(x) = x**(a-1)*exp(-x/b)/(Gamma(a)*b**a). This parameterization comes from the PDG "Passage of particles through matter" section 32.5. I also fit the data from my RAT-PAC simulation, but currently I am not using it, and instead using a simpler form to calculate the coefficients from the PDG (although I estimated the b parameter from the RAT-PAC data). I also sped up the calculation of the solid angle by making a lookup table since it was taking a significant fraction of the time to compute the likelihood function. --- src/proton.h | 1 + 1 file changed, 1 insertion(+) (limited to 'src/proton.h') diff --git a/src/proton.h b/src/proton.h index 8e19e9c..008f835 100644 --- a/src/proton.h +++ b/src/proton.h @@ -4,6 +4,7 @@ #include /* for size_t */ double proton_get_range(double T, double rho); +double proton_get_dEdx_rad(double T, double rho); double proton_get_dEdx(double T, double rho); #endif -- cgit