What the code is doing preliminary: I compute the probabilities for N particles in an event (with simplification that Nmax=5)

For 1 event: -I generate N particles, in random position (X, Y) according to the beam profile (Umberto's results) -Particles only have Pz componant (simplification) -Using the position (X,Y), I take the efficiency of each 2s Modules at this position (Riccardo's results). -check if the particle give a track in each of the stations (2X, 2Y and at least 1U/V stubs) -try match tracks in stations 1 and tracks in stations 2

Run the code: to build the library: $ make to run macros: cd macros/ root efficiency.cpp (You have to be in macros folder to use the macro, it won't use rootlogon.C otherwise)