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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 | /////////////////////////////////////////////////////////////////////////////// |
| 17 | // // |
| 18 | // // |
| 19 | // TRD chamber local track (LTU, tracklet) // |
| 20 | // // |
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21 | // Author: // |
| 22 | // Bogdan Vulpescu // |
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23 | // // |
| 24 | /////////////////////////////////////////////////////////////////////////////// |
| 25 | |
| 26 | #include <TMath.h> |
| 27 | |
| 28 | #include "AliTRDltuTracklet.h" |
| 29 | |
| 30 | ClassImp(AliTRDltuTracklet) |
| 31 | |
| 32 | //_____________________________________________________________________________ |
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33 | AliTRDltuTracklet::AliTRDltuTracklet() |
| 34 | :TObject() |
| 35 | ,fX(0) |
| 36 | ,fY(0) |
| 37 | ,fSlope(0) |
| 38 | ,fRowz(0) |
| 39 | ,fDetector(0) |
| 40 | ,fRow(0) |
| 41 | ,fNclusters(0) |
| 42 | ,fLabel(0) |
| 43 | ,fQ(0) |
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44 | { |
| 45 | // |
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46 | // AliTRDltuTracklet default constructor |
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47 | // |
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48 | |
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49 | } |
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50 | |
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51 | //_____________________________________________________________________________ |
| 52 | AliTRDltuTracklet::AliTRDltuTracklet(Int_t det, Int_t row, Float_t rowz |
| 53 | , Float_t slope, Float_t offset, Float_t time |
| 54 | , Int_t ncl, Int_t label, Float_t q) |
| 55 | :TObject() |
| 56 | ,fX(time) |
| 57 | ,fY(offset) |
| 58 | ,fSlope(slope) |
| 59 | ,fRowz(rowz) |
| 60 | ,fDetector(det) |
| 61 | ,fRow(row) |
| 62 | ,fNclusters(ncl) |
| 63 | ,fLabel(label) |
| 64 | ,fQ(q) |
| 65 | { |
| 66 | // |
| 67 | // AliTRDltuTracklet constructor |
| 68 | // |
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69 | |
| 70 | } |
| 71 | |
| 72 | //_____________________________________________________________________________ |
| 73 | AliTRDltuTracklet::~AliTRDltuTracklet() |
| 74 | { |
| 75 | // |
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76 | // Destructor |
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77 | // |
| 78 | |
| 79 | } |
| 80 | |
| 81 | //_____________________________________________________________________________ |
| 82 | Float_t AliTRDltuTracklet::GetPt(Float_t field) const |
| 83 | { |
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84 | // |
| 85 | // Transverse momentum calculation |
| 86 | // Curvature R = (fX*fX + fY*fY) / (2 * sin(alpha)) |
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87 | // alpha = angle deviation from "infinite momentum" |
| 88 | // |
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89 | // Consistent with AliTRDmcmTracklet::GetPt(...) |
| 90 | // |
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91 | |
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92 | Float_t infSlope = TMath::ATan(fY/fX) / TMath::Pi()*180.0; |
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93 | Float_t alpha = fSlope - infSlope; |
| 94 | Float_t r = TMath::Sqrt(fX*fX + fY*fY) |
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95 | / (2.0 * TMath::Sin(alpha/180.0*TMath::Pi())); |
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96 | |
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97 | Float_t pt = 0.3 * field * 0.01 * r; |
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98 | |
| 99 | return pt; |
| 100 | |
| 101 | } |
| 102 | |
| 103 | //_____________________________________________________________________________ |
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104 | Int_t AliTRDltuTracklet::Compare(const TObject *o) const |
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105 | { |
| 106 | // |
| 107 | // compare two LTU tracklets according to the intercept point Y1 |
| 108 | // |
| 109 | |
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110 | AliTRDltuTracklet *ltutrk = (AliTRDltuTracklet *) o; |
| 111 | |
| 112 | if (fRow != ltutrk->fRow) { |
| 113 | return +1; |
| 114 | } |
| 115 | if (fDetector != ltutrk->fDetector) { |
| 116 | return +1; |
| 117 | } |
| 118 | |
| 119 | if (fY < ltutrk->fY) { |
| 120 | return -1; |
| 121 | } |
| 122 | if (fY == ltutrk->fY) { |
| 123 | return 0; |
| 124 | } |
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125 | |
| 126 | return 1; |
| 127 | |
| 128 | } |
| 129 | |
| 130 | //_____________________________________________________________________________ |
| 131 | Float_t AliTRDltuTracklet::GetYproj(Float_t xpl) const |
| 132 | { |
| 133 | // |
| 134 | // y-projection (bending plane) onto the median plane |
| 135 | // |
| 136 | |
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137 | Float_t yproj = fY + TMath::Tan(fSlope/180.0*TMath::Pi()) * (xpl - fX); |
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138 | |
| 139 | return yproj; |
| 140 | |
| 141 | } |
| 142 | |
| 143 | //_____________________________________________________________________________ |
| 144 | Float_t AliTRDltuTracklet::GetZproj(Float_t xpl) const |
| 145 | { |
| 146 | // |
| 147 | // z-projection (using pad row center) onto the median plane |
| 148 | // |
| 149 | |
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150 | Float_t zproj = fRowz * xpl / fX; |
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151 | |
| 152 | return zproj; |
| 153 | |
| 154 | } |
| 155 | |
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