TailFracS0HadEarlyEcalBar1.cxx Source File

00001 #include "FastShowerUtils/Samplers/TailFracS0HadEarlyEcalBar1.h"
00002 #include "FastShowerUtils/PolyArgs.h"
00003 
00004 #include <cmath>
00005 namespace FastShower{
00006 
00007   double TailFracS0HadEarlyEcalBar1::value(const PolyArgs& pa) const {
00008 
00009     double energy  = pa.pp()->energy();
00010     double aDelEta = fabs(pa.pp()->delEta());
00011     //
00012     double p1 = 0.04911 + 0.0005584*energy;
00013     double p2 = -0.003471 + 0.0003688*energy;
00014     double p3 = 0.7961 + 0.001650*energy;
00015     //
00016     return  1. - p3/(1. + std::exp((aDelEta-p1)/p2));
00017   }
00018   //
00019   IFn* TailFracS0HadEarlyEcalBar1::clone() const {
00020     return new TailFracS0HadEarlyEcalBar1();
00021   }
00022 }//namespace
00023 
00024