Changes between Version 13 and Version 14 of perWeight

Timestamp:

Dec 30, 2018, 1:06:54 PM (6 years ago)

Author:

mosel

Comment:

--

perWeight

@@ -39 +39 @@
 
 == How to compute cross sections from the perturbative weights ==
-The output file `FinalEvents.dat` contains all the events generated. Per event all the four-momenta of final state particles are listed together with the incoming neutrino energy and various other useful properties (see documentation for `FinalEvents.dat`). As an example we consider here the calculation of the differential cross section dsigma/dE for the outgoing lepton. In `FinalEvents.dat` the lines with the particle number 902 contain all the muon kinematics as well as the perweight. In order to produce a spectrum one first has to bin the muon energies into energy bins. This binning process must preserve the connection between energy and perweight. Then all the perweights in a given energy bin are summed and divided by the bin width to obtain the differential cross section. If the GiBUU run used - for better statistics - a number of runs >1 at the same energies, then this number of runs has to be divided out to obtain the final differential cross section.
+The output file `FinalEvents.dat` contains all the events generated. Per event all the four-momenta of final state particles are listed together with the incoming neutrino energy and various other useful properties (see documentation for `FinalEvents.dat`). 
+
+As an example we consider here the calculation of the CC inclusive differential cross section dsigma/dE_mu for a neutrino-induced reaction on a nucleus; E_mu is the energy of the outgoing muon. In `FinalEvents.dat` the lines with the particle number 902 contain all the muon kinematics as well as the perweight. In order to produce a spectrum one first has to bin the muon energies into energy bins. This binning process must preserve the connection between energy and perweight. Then all the perweights in a given energy bin are summed and divided by the bin width to obtain the differential cross section. If the GiBUU run used - for better statistics - a number of runs >1 at the same energies, then this number of runs has to be divided out to obtain the final differential cross section.
 
 All cross sections in GiBUU, both the precomputed ones and the reconstructed ones, are given per nucleon. The units are 10^-38^ cm^2^ for neutrinos and 10^-33^ cm^2^ for electrons.