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probAnalytic.cc
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probAnalytic.cc
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///
// Analytic mu2e probabilities in vacuum
//
#include <math.h>
#include <iostream>
#include <fstream>
#include "BargerPropagator.h"
#include "TFile.h"
#include "TH1D.h"
#include <cstdlib>
#include <ctime>
#include <string>
#include <sstream>
double GetAnalyticMu2E( double x12, double x13, double x23, double m21,
double m23, double Delta, double Energy_ , bool kSquared, int, double, double density = 0. );
using namespace std;
int main(int argc, char * argv[] )
{
double dcp_in = 0.;
double h_in = 1.0;
int v_in = 1 ;
if( argc >= 2 ) dcp_in = (double) atof( argv[1] );
if( argc >= 3 ) h_in = (double) atof( argv[2] );
if( argc >= 4 ) v_in = (int) atoi( argv[3] );
h_in = ( h_in > 0 ? 1.0 : -1.0 );
double total_prob=0.0;
double path, energy;
double e_start, e_end, e_step, path_start, path_end, path_step;
double d_start, d_end, d_step;
int i, j ;
//// Binning
int NBinsEnergy = 10000;
int NBinsPath = 10000;
// Path Length
double PathLengthEdge[NBinsPath+1];
double BasePath = 295.0;
path_start = 0.1;
path_end = 1.0e2;
path_step = log10( path_end/path_start)/double(NBinsPath);
// Energy Range
double EnergyBins[NBinsEnergy+1];
double BaseEnergy = 0.004;
e_start = 0.010;
e_end = 10.0;
e_step = log10(e_end/e_start)/double(NBinsEnergy);
/// Oscillation Parameters
bool kSquared = true; // using sin^2(x) variables?
int kNuBar = 1 * v_in;
double DM2 = h_in * 2.4e-3;
double Theta23 = 0.5 ;
double Theta13 = 0.025 ;
double dm2 = 7.6e-5;
double Theta12 = 0.312;
double delta = dcp_in * (3.1415926/180.0);
double density = 0.0 ; // g/cm3
std::cout << "Using " << std::endl
<< " DM2 " << DM2 << std::endl
<< " Theta23 " << Theta23 << std::endl
<< " Theta13 " << Theta13 << std::endl
<< " dm2 " << dm2 << std::endl
<< " Theta12 " << Theta12 << std::endl;
double Entry = e_start;
for(i=0; i<NBinsEnergy; i++ )
{
Entry = e_start*pow( 10.0 , double(i)*e_step );
EnergyBins[i] = Entry;
}
EnergyBins[NBinsEnergy] = EnergyBins[NBinsEnergy-1]*1.001;
PathLengthEdge[0]= path_start;
for ( i=1; i<NBinsPath ; i++ ){
Entry = path_start * pow( 10.0, double(i)*path_step );
PathLengthEdge[i] = Entry;
}
PathLengthEdge[NBinsPath] = PathLengthEdge[NBinsPath-1]*1.001;
stringstream ssE, ssL;
TH1D * histos[3][2];
///////////////////////////
/// mu to E
ssE.str(""); ssE << "P(#nu_{#mu} #rightarrow #nu_{e})" << " L = " << BasePath ;
ssL.str(""); ssL << "P(#nu_{#mu} #rightarrow #nu_{e})" << " E = " << BaseEnergy;
TH1D * lmu2eE = new TH1D("lmu2eE", ssE.str().c_str() , NBinsEnergy -1 , EnergyBins );
TH1D * lmu2eL = new TH1D("lmu2eL", ssL.str().c_str() , NBinsPath -1 , PathLengthEdge );
histos[0][0] = lmu2eE;
histos[0][1] = lmu2eL;
double prob;
for ( i = 0 ; i <= NBinsEnergy ; i ++ )
{
energy = e_start*pow(10.0, double(i)*e_step);
prob = GetAnalyticMu2E( Theta12, Theta13, Theta23, dm2, DM2, delta ,
energy, kSquared, kNuBar, BasePath, density );
for( j = 0 ; j < 1 ; j++ )
histos[j][0]->Fill( energy, prob );
} // End Energy Loop //
for ( i = 0 ; i <= NBinsPath ; i ++ )
{
path = path_start*pow(10.0, double(i)*path_step );
prob = GetAnalyticMu2E( Theta12, Theta13, Theta23, dm2, DM2, delta ,
energy, kSquared, kNuBar, path, density );
for( j = 0 ; j < 1 ; j++ )
histos[j][1]->Fill( path , prob );
} // End Path Loop //
TFile *tmp = new TFile("Analytic.root", "recreate");
tmp->cd();
for( j = 0 ; j < 1 ; j++ ){
histos[j][0]->Write();
histos[j][1]->Write();
}
tmp->Close();
cout << endl<<"Done Cowboy!" << endl;
return 0;
}
// This formula is exact for vacuum oscillations
// And only approximate otherwise
// Based on B.Richter hep-ph/0008222
double GetAnalyticMu2E( double x12, double x13, double x23,
double m21, double m23, double Delta,
double Energy_ , bool kSquared, int kNuBar, double L, double density )
{
double Energy = Energy_;
// 2*sqrt(2)*Gfermi in (eV^2-cm^3)/(mole-GeV) - for e<->[mu,tau] //
double tworttwoGf = 1.52588e-4;
double A = tworttwoGf * density * 0.5 * Energy ;
double Vmat = A * L / (4.0 * Energy );
if( kNuBar < 0 )
{
Delta *= -1.0 ;
Vmat *= -1.0 ;
A *= -1.0 ;
}
double cd = cos( Delta );
double sd = sin( Delta );
double s12;
double s13;
double s23;
double c12;
double c13;
double c23;
double s213;
double s212;
double s223;
//if xAB = sin( xAB )^2
if ( kSquared ){
s12 = sqrt( x12 );
s13 = sqrt( x13 );
s23 = sqrt( x23 );
s213 = sin( 2.0 * asin( s13 ));
s212 = sin( 2.0 * asin( s12 ));
s223 = sin( 2.0 * asin( s23 ));
c12 = sqrt( 1.0 - x12 );
c13 = sqrt( 1.0 - x13 );
c23 = sqrt( 1.0 - x23 );
}
else
{
//if xAB = sin( 2 xAB )^2
s12 = sqrt( 0.5*(1 - sqrt(1 - x12 )) );
s13 = sqrt( 0.5*(1 - sqrt(1 - x13 )) );
s23 = sqrt( 0.5*(1 - sqrt(1 - x23 )) );
c12 = sqrt( 1.0 - s12*s12 );
c13 = sqrt( 1.0 - s13*s13 );
c23 = sqrt( 1.0 - s23*s23 );
s213 = sqrt( x13 );
s212 = sqrt( x12 );
s223 = sqrt( x23 );
}
double d21 = (1.2667 * m21 * L / Energy );
double d32 = (1.2667 * m23 * L / Energy );
double d31 = (1.2667 * (m23+m21) * L / Energy );
double dom = 4.0 * c13 * c13 * s13 * s13 * s23 * s23 * sin( d31) *sin( d31 );
double cpc = 8.0 * c13 * c13 * s12 * s13 * s23 *
( c12 *c23 * cd - s12*s13*s23 ) * cos( d32 )* sin( d31 ) * sin( d21 );
double cpv = -8.0 * c13*c13 * c12 * c23 * s12 * s13 * s23 * sd * sin( d32 ) * sin( d31 ) * sin( d21 );
double sol = 4.0 * s12 * s12 * c13 * c13 * ( c12 * c12 * c23 * c23
+ s12 * s12 * s23 * s23 * s13 * s13
- 2.0 * c12 * c23 * s12 * s23 * s13 * cd ) * sin(d21) * sin( d21 );
// This form is only valid when A / m31 is small
double mat = dom * 2.0 * A * ( 1 - 2.0 * s13 * s13 ) / (m23+m21) ;
mat += - 8.0 * c12 * c12 * s13 * s13 * s23 * s23 * ( 1 - 2.0 * s13 * s13 ) *
Vmat * cos( d32 ) * sin( d31 );
double prob = dom + cpc + cpv + sol + mat ;
return prob;
}