1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 // -----------------------
19 // Class AliMUONMathieson
20 // -----------------------
21 // Implementation of Mathieson response
22 // Separated from other classes by CH. Finck with removing circular
25 #include "AliMUONMathieson.h"
34 ClassImp(AliMUONMathieson)
37 //__________________________________________________________________________
38 AliMUONMathieson::AliMUONMathieson() :
48 /// Default constructor
52 //__________________________________________________________________________
53 AliMUONMathieson::~AliMUONMathieson()
58 //__________________________________________________________________________
59 void AliMUONMathieson::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
61 /// Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
62 /// in the X direction, perpendicular to the wires,
63 /// and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
64 /// in the same direction
66 fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3);
67 Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3));
68 fKx4 = cx1 / fKx2 / fSqrtKx3;
71 //__________________________________________________________________________
72 void AliMUONMathieson::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
74 /// Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
75 /// in the Y direction, along the wires,
76 /// and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
77 /// in the same direction
79 fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3);
80 Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3));
81 fKy4 = cy1 / fKy2 / fSqrtKy3;
84 //_____________________________________________________________________________
86 AliMUONMathieson::IntXY(Float_t xi1, Float_t yi1, Float_t xi2, Float_t yi2) const
88 /// Integrate the Mathieson over x and y
95 // The Mathieson function
96 Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
97 Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
99 Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
100 Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
103 return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
104 fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
107 //______________________________________________________________________________
109 AliMUONMathieson::SetPitch(Float_t p1)
111 /// Defines the pitch, and store its inverse, which is what is used in fact.
116 fInversePitch = 1/fPitch;
120 AliError(Form("Invalid pitch %e",p1));