#ifndef physics_constants
#define physics_constants

const double alphaQED=1/137.036;
const double hbarcSqr=389.37966;	// in GeV*GeV*ub

const double mElectron=0.51099907e-3;
const double mMuon=0.105658389;

const complex I_(0,1);
const double PI_=2*atan2(1,0);