Added an IntXY method w/o segmentation parameter (used in the new
[u/mrichter/AliRoot.git] / MUON / AliMUONMathieson.cxx
CommitLineData
7e4a628d 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
16/* $Id$ */
17
7e4a628d 18#include "AliMUONMathieson.h"
471035eb 19
20#include "AliLog.h"
a713db22 21#include "AliMUONGeometrySegmentation.h"
7e4a628d 22
471035eb 23#include <TClass.h>
24#include <TMath.h>
25#include <TRandom.h>
7e4a628d 26
27ClassImp(AliMUONMathieson)
28
29//__________________________________________________________________________
a713db22 30 AliMUONMathieson::AliMUONMathieson() :
31 fSqrtKx3(0.),
32 fKx2(0.),
33 fKx4(0.),
34 fSqrtKy3(0.),
35 fKy2(0.),
36 fKy4(0.),
37 fPitch(0.)
7e4a628d 38{
39// Default constructor
40
41}
42
43 //__________________________________________________________________________
44void AliMUONMathieson::SetSqrtKx3AndDeriveKx2Kx4(Float_t SqrtKx3)
45{
46 // Set to "SqrtKx3" the Mathieson parameter K3 ("fSqrtKx3")
47 // in the X direction, perpendicular to the wires,
48 // and derive the Mathieson parameters K2 ("fKx2") and K4 ("fKx4")
49 // in the same direction
50 fSqrtKx3 = SqrtKx3;
51 fKx2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKx3);
52 Float_t cx1 = fKx2 * fSqrtKx3 / 4. / TMath::ATan(Double_t(fSqrtKx3));
53 fKx4 = cx1 / fKx2 / fSqrtKx3;
54}
55
56 //__________________________________________________________________________
57void AliMUONMathieson::SetSqrtKy3AndDeriveKy2Ky4(Float_t SqrtKy3)
58{
59 // Set to "SqrtKy3" the Mathieson parameter K3 ("fSqrtKy3")
60 // in the Y direction, along the wires,
61 // and derive the Mathieson parameters K2 ("fKy2") and K4 ("fKy4")
62 // in the same direction
63 fSqrtKy3 = SqrtKy3;
64 fKy2 = TMath::Pi() / 2. * (1. - 0.5 * fSqrtKy3);
65 Float_t cy1 = fKy2 * fSqrtKy3 / 4. / TMath::ATan(Double_t(fSqrtKy3));
66 fKy4 = cy1 / fKy2 / fSqrtKy3;
67}
7e4a628d 68
471035eb 69//_____________________________________________________________________________
70Float_t
71AliMUONMathieson::IntXY(Float_t xi1, Float_t yi1, Float_t xi2, Float_t yi2) const
72{
73 AliDebug(1,Form("xi1=%e yi1=%e xi2=%e yi2=%e",xi1,yi1,xi2,yi2));
74
75 const Float_t kInversePitch = 1./fPitch;
76 xi1 *= kInversePitch;
77 xi2 *= kInversePitch;
78 yi1 *= kInversePitch;
79 yi2 *= kInversePitch;
80 //
81 // The Mathieson function
82 Double_t ux1=fSqrtKx3*TMath::TanH(fKx2*xi1);
83 Double_t ux2=fSqrtKx3*TMath::TanH(fKx2*xi2);
84
85 Double_t uy1=fSqrtKy3*TMath::TanH(fKy2*yi1);
86 Double_t uy2=fSqrtKy3*TMath::TanH(fKy2*yi2);
87
88
89 return Float_t(4.*fKx4*(TMath::ATan(ux2)-TMath::ATan(ux1))*
90 fKy4*(TMath::ATan(uy2)-TMath::ATan(uy1)));
91}
92
a713db22 93// -------------------------------------------
94Float_t AliMUONMathieson::IntXY(Int_t idDE, AliMUONGeometrySegmentation* segmentation)
95{
96// Calculate charge on current pad according to Mathieson distribution
97// using Detection elt
a713db22 98//
99// Integration limits defined by segmentation model
100//
101 Float_t xi1, xi2, yi1, yi2;
102 segmentation->IntegrationLimits(idDE, xi1,xi2,yi1,yi2);
471035eb 103 return IntXY(xi1,yi1,xi2,yi2);
a713db22 104}