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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; }  // not used
    G4double NoiseResolution() { return 0.00; }  // not used
    G4double SamplingResolution() { return 0.11; }
};

#endif