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GFlashSamplingShowerTuning.hh
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27 // $Id: GFlashSamplingShowerTuning.hh 68057 2013-03-13 14:46:00Z gcosmo $
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29 //
30 //---------------------------------------------------------------
31 // GEANT 4 class header file
32 //
33 // GFlashSamplingShowerTuning
34 //
35 // Class description:
36 //
37 // Tuning class for GFlash homogeneous shower parameterisation.
38 // Definitions:
39 // <t>: shower center of gravity
40 // T: Depth at shower maximum
41 // Ec: Critical energy
42 // X0: Radiation length
43 // y = E/Ec
44 //
45 // Please, see hep-ex/0001020 for details.
46 
47 // Author: Joanna Weng - 11.2005
48 //---------------------------------------------------------------
49 #ifndef GFlashSamplingShowerTuning_hh
50 #define GFlashSamplingShowerTuning_hh
51 
53 
55 {
56  public:
57 
60 
61 
62  public: // with description
63 
64  G4double ParsAveT1(){ return -0.55;} // t1
65  G4double ParsAveT2(){ return -0.69;} // t2
66  // T_sam = log(exp( log T_hom) + t1*Fs-1 + t2*(1-ehat))
67 
68  G4double ParsAveA1(){ return -0.476; } // a1
69  // alpha_sam = log(exp(log alphah_hom) +(a1*Fs-1))
70 
71  G4double ParsSigLogT1(){ return -2.5;} // t1
72  G4double ParsSigLogT2(){ return 1.25;} // t2
73  // std::sqrt(var(ln(T_sam))) = 1/(t+t2*ln(y))
74 
75  G4double ParsSigLogA1(){ return -0.82;} // a1
76  G4double ParsSigLogA2(){ return 0.79; } // a2
77  // std::sqrt(var(ln(alpha_sam))) = 1/(a1+a2*ln(y))
78 
79  G4double ParsRho1(){ return 0.784; } // r1
80  G4double ParsRho2(){ return -0.023;} // r2
81  // Correlation(ln(T),ln(alpha))=r1+r2*ln(y)
82 
83  // Radial profiles
84  // f(r) := (1/dE(t))(dE(t,r)/dr)
85  // Ansatz:
86  // f(r) = p(2*r*Rc**2)/(r**2+Rc**2)**2+(1-p)*(2*r*Rt**2)/(r**2+Rt**2)**2,
87  // 0<p<1
88 
89  G4double ParsRC1(){ return -0.0203; } // c1
90  G4double ParsRC2(){ return 0.0397; } // c2
91  // Rc_sam = Rc_hom + c1 * (1-ehat) + c2 *Fs-1*exp (-tau)
92 
93  G4double ParsRT1(){ return -0.14; } // t1
94  G4double ParsRT2(){ return -0.495; } // t2
95  // Rt_sam = Rc_hom + t1 * (1-ehat) + t2 *Fs-1*exp (-tau)
96 
97  G4double ParsWC1(){ return 0.348; } // c1
98  G4double ParsWC2(){ return -0.642;} // c2
99  // W_sam = W_hom + (1-ehat)*(c1 + c2 *Fs-1 * exp (- (tau -1 )**2))
100 
101  // Fluctuations on radial profiles through number of spots
102  // The total number of spots needed for a shower is
103 
104  G4double ParsSpotN1(){ return 10.3; } // n1
105  G4double ParsSpotN2(){ return 0.959;} // n2
106  // Ns = n1*ln(Z)(E/GeV)**n2
107 
108  // The number of spots per longitudinal interval is:
109  // (1/Ns)(dNs(t)/dt) = f(t)
110  // = (beta*t)**(alpha-1)*beta*std::exp(-beta*t)/Gamma(alpha)
111  // <t> = alpha_s/beta_s
112  // Ts = (alpha_s-1)/beta_s
113  // and
114  // Ts = T*(t1+t2*Z)
115  // alpha_s = alpha*(a1+a2*Z)
116 
117  G4double ParsSpotT1(){ return 0.813; } // t1
118  G4double ParsSpotT2(){ return 0.0019;} // t2
119 
120  G4double ParsSpotA1(){ return 0.844; } //a1
121  G4double ParsSpotA2(){ return 0.0026;} //a2
122 
123  // Resolution
124 
125  G4double ConstantResolution(){ return 0.00; }
126  G4double NoiseResolution() { return 0.00; } // not used
127  G4double SamplingResolution(){ return 0.11; } // not used
128 
129 };
130 
131 #endif
double G4double
Definition: G4Types.hh:76