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 //---------------------------------------------------------------
 //  GEANT 4 class header file
 //
 //  GFlashSamplingShowerTuning
 //
 //  Class description:
 //
 //  Tuning class for GFlash homogeneous shower parameterisation.
 //  Definitions:
 //    <t>: shower center of gravity
 //      T: Depth at shower maximum
 //     Ec: Critical energy
 //     X0: Radiation length
 //     y = E/Ec
 //
 //  Please, see hep-ex/0001020 for details.
 
 // Author: Joanna Weng - 11.2005
 //
 // Usage: use new statement for new instance of class, do not delete.
 //        The instance of class will be deleted in
 //        GFlashSamplingShowerParameterisation Destructor.
 //---------------------------------------------------------------
 #ifndef GFlashSamplingShowerTuning_hh
 #define GFlashSamplingShowerTuning_hh
 
 #include "GVFlashHomoShowerTuning.hh"
 
 class GFlashSamplingShowerTuning : public GVFlashHomoShowerTuning
 {
   public:
 
     GFlashSamplingShowerTuning() {}
     virtual ~GFlashSamplingShowerTuning() {}
   
 
   public: // with description
 
   G4double ParsAveT1(){ return -0.55;} // t1
   G4double ParsAveT2(){ return -0.69;} // t2
     // T_sam =  log(exp( log T_hom) + t1*Fs-1 + t2*(1-ehat))
 
   G4double ParsAveA1(){ return -0.476;  } // a1
     // alpha_sam = log(exp(log alphah_hom) +(a1*Fs-1))
 
   G4double ParsSigLogT1(){ return -2.5;} // t1
   G4double ParsSigLogT2(){ return 1.25;} // t2
     // std::sqrt(var(ln(T_sam))) = 1/(t+t2*ln(y))
 
   G4double ParsSigLogA1(){ return -0.82;} // a1
   G4double ParsSigLogA2(){ return 0.79; } // a2
     // std::sqrt(var(ln(alpha_sam))) = 1/(a1+a2*ln(y))
 
   G4double ParsRho1(){ return 0.784; } // r1
   G4double ParsRho2(){ return -0.023;} // r2
     // Correlation(ln(T),ln(alpha))=r1+r2*ln(y)
 
   // Radial profiles
   // f(r) := (1/dE(t))(dE(t,r)/dr)
   // Ansatz:
   // f(r) = p(2*r*Rc**2)/(r**2+Rc**2)**2+(1-p)*(2*r*Rt**2)/(r**2+Rt**2)**2,
   //        0<p<1
 
   G4double ParsRC1(){ return -0.0203;   } // c1
   G4double ParsRC2(){ return 0.0397;  }   // c2
     // Rc_sam = Rc_hom + c1 * (1-ehat) + c2 *Fs-1*exp (-tau)
 
   G4double ParsRT1(){ return -0.14;  }   // t1
   G4double ParsRT2(){ return -0.495; }   // t2
     // Rt_sam = Rc_hom + t1 * (1-ehat) + t2 *Fs-1*exp (-tau)
 
   G4double ParsWC1(){ return 0.348;   } // c1
   G4double ParsWC2(){ return -0.642;} // c2
     // W_sam = W_hom + (1-ehat)*(c1 + c2 *Fs-1 * exp (- (tau -1 )**2))
 
   // Fluctuations on radial profiles through number of spots
   // The total number of spots needed for a shower is
 
   G4double ParsSpotN1(){ return 10.3; } // n1
   G4double ParsSpotN2(){ return 0.959;} // n2
     // Ns = n1*ln(Z)(E/GeV)**n2
 
   // The number of spots per longitudinal interval is:
   // (1/Ns)(dNs(t)/dt) = f(t)
   //  = (beta*t)**(alpha-1)*beta*std::exp(-beta*t)/Gamma(alpha)
   // <t> = alpha_s/beta_s
   // Ts = (alpha_s-1)/beta_s
   // and
   // Ts = T*(t1+t2*Z)
   // alpha_s = alpha*(a1+a2*Z)
 
   G4double ParsSpotT1(){ return 0.813; } // t1
   G4double ParsSpotT2(){ return 0.0019;} // t2
 
   G4double ParsSpotA1(){ return 0.844; } //a1
   G4double ParsSpotA2(){ return 0.0026;} //a2
 
   // Resolution
 
   G4double ConstantResolution(){ return 0.00;  }  
   G4double NoiseResolution()   { return 0.00;  } // not used    
   G4double SamplingResolution(){ return 0.11;  } // not used
 
 };
 
 #endif

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