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f1d945a1 | 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 | ||
f1d945a1 | 18 | // AliFlowTrackSimple: |
19 | // A simple track class to the the AliFlowEventSimple for flow analysis | |
20 | // | |
21 | // | |
22 | // author: N. van der Kolk (kolk@nikhef.nl) | |
929098e4 | 23 | // mods: Mikolaj Krzewicki (mikolaj.krzewicki@cern.ch) |
f1d945a1 | 24 | |
bc231a12 | 25 | #include "TObject.h" |
929098e4 | 26 | #include "TParticle.h" |
701f71c1 | 27 | #include "TParticlePDG.h" |
929098e4 | 28 | #include "AliFlowTrackSimple.h" |
7382279b | 29 | #include "TRandom.h" |
701f71c1 | 30 | #include "TMath.h" |
f1d945a1 | 31 | |
32 | ClassImp(AliFlowTrackSimple) | |
33 | ||
34 | //----------------------------------------------------------------------- | |
929098e4 | 35 | AliFlowTrackSimple::AliFlowTrackSimple(): |
bc231a12 | 36 | TObject(), |
f1d945a1 | 37 | fEta(0), |
38 | fPt(0), | |
39 | fPhi(0), | |
44e060e0 | 40 | fTrackWeight(1.), |
701f71c1 | 41 | fCharge(0), |
fb03b63f | 42 | fFlowBits(0), |
43 | fSubEventBits(0) | |
f1d945a1 | 44 | { |
45 | //constructor | |
929098e4 | 46 | } |
47 | ||
244c607a | 48 | //----------------------------------------------------------------------- |
701f71c1 | 49 | AliFlowTrackSimple::AliFlowTrackSimple(Double_t phi, Double_t eta, Double_t pt, Double_t weight, Int_t charge): |
bc231a12 | 50 | TObject(), |
244c607a | 51 | fEta(eta), |
52 | fPt(pt), | |
53 | fPhi(phi), | |
44e060e0 | 54 | fTrackWeight(weight), |
701f71c1 | 55 | fCharge(charge), |
244c607a | 56 | fFlowBits(0), |
57 | fSubEventBits(0) | |
58 | { | |
59 | //constructor | |
60 | } | |
61 | ||
929098e4 | 62 | //----------------------------------------------------------------------- |
701f71c1 | 63 | AliFlowTrackSimple::AliFlowTrackSimple( TParticle* p ): |
bc231a12 | 64 | TObject(), |
929098e4 | 65 | fEta(p->Eta()), |
66 | fPt(p->Pt()), | |
67 | fPhi(p->Phi()), | |
44e060e0 | 68 | fTrackWeight(1.), |
701f71c1 | 69 | fCharge(0), |
929098e4 | 70 | fFlowBits(0), |
71 | fSubEventBits(0) | |
72 | { | |
73 | //ctor | |
701f71c1 | 74 | TParticlePDG* ppdg = p->GetPDG(); |
75 | fCharge = TMath::Nint(ppdg->Charge()/3.0); | |
f1d945a1 | 76 | } |
77 | ||
bc6b015e | 78 | //----------------------------------------------------------------------- |
bc6b015e | 79 | AliFlowTrackSimple::AliFlowTrackSimple(const AliFlowTrackSimple& aTrack): |
bc231a12 | 80 | TObject(aTrack), |
bc6b015e | 81 | fEta(aTrack.fEta), |
82 | fPt(aTrack.fPt), | |
83 | fPhi(aTrack.fPhi), | |
44e060e0 | 84 | fTrackWeight(aTrack.fTrackWeight), |
701f71c1 | 85 | fCharge(aTrack.fCharge), |
fb03b63f | 86 | fFlowBits(aTrack.fFlowBits), |
87 | fSubEventBits(aTrack.fSubEventBits) | |
bc6b015e | 88 | { |
89 | //copy constructor | |
90 | } | |
bc231a12 | 91 | |
bc6b015e | 92 | //----------------------------------------------------------------------- |
65ef7d1a | 93 | AliFlowTrackSimple* AliFlowTrackSimple::Clone(const char* /*option*/) const |
bc231a12 | 94 | { |
95 | //clone "constructor" | |
96 | return new AliFlowTrackSimple(*this); | |
97 | } | |
bc6b015e | 98 | |
bc231a12 | 99 | //----------------------------------------------------------------------- |
bc6b015e | 100 | AliFlowTrackSimple& AliFlowTrackSimple::operator=(const AliFlowTrackSimple& aTrack) |
101 | { | |
102 | fEta = aTrack.fEta; | |
103 | fPt = aTrack.fPt; | |
104 | fPhi = aTrack.fPhi; | |
44e060e0 | 105 | fTrackWeight = aTrack.fTrackWeight; |
701f71c1 | 106 | fCharge = aTrack.fCharge; |
bc6b015e | 107 | fFlowBits = aTrack.fFlowBits; |
fb03b63f | 108 | fSubEventBits = aTrack.fSubEventBits; |
bc6b015e | 109 | |
110 | return *this; | |
bc6b015e | 111 | } |
112 | ||
f1d945a1 | 113 | //----------------------------------------------------------------------- |
f1d945a1 | 114 | AliFlowTrackSimple::~AliFlowTrackSimple() |
115 | { | |
116 | //destructor | |
117 | ||
118 | } | |
119 | ||
7382279b | 120 | //----------------------------------------------------------------------- |
244c607a | 121 | void AliFlowTrackSimple::ResolutionPt(Double_t res) |
7382279b | 122 | { |
244c607a | 123 | //smear the pt by a gaussian with sigma=res |
124 | fPt += gRandom->Gaus(0.,res); | |
7382279b | 125 | } |
126 | ||
127 | //----------------------------------------------------------------------- | |
bc231a12 | 128 | void AliFlowTrackSimple::AddV1( Double_t v1, |
129 | Double_t reactionPlaneAngle, | |
130 | Double_t precisionPhi, | |
131 | Int_t maxNumberOfIterations ) | |
132 | { | |
133 | //afterburner, adds v1, uses Newton-Raphson iteration | |
134 | Double_t phi0=fPhi; | |
c855d803 | 135 | Double_t f=0.; |
136 | Double_t fp=0.; | |
137 | Double_t phiprev=0.; | |
bc231a12 | 138 | |
139 | for (Int_t i=0; i<maxNumberOfIterations; i++) | |
140 | { | |
141 | phiprev=fPhi; //store last value for comparison | |
142 | f = fPhi-phi0+2.0*v1*TMath::Sin(fPhi-reactionPlaneAngle); | |
143 | fp = 1.0+2.0*v1*TMath::Cos(fPhi-reactionPlaneAngle); //first derivative | |
144 | fPhi -= f/fp; | |
145 | if (TMath::AreEqualAbs(phiprev,fPhi,precisionPhi)) break; | |
146 | } | |
147 | } | |
148 | ||
149 | //----------------------------------------------------------------------- | |
150 | void AliFlowTrackSimple::AddV2( Double_t v2, | |
151 | Double_t reactionPlaneAngle, | |
152 | Double_t precisionPhi, | |
153 | Int_t maxNumberOfIterations ) | |
7382279b | 154 | { |
244c607a | 155 | //afterburner, adds v2, uses Newton-Raphson iteration |
156 | Double_t phi0=fPhi; | |
c855d803 | 157 | Double_t f=0.; |
158 | Double_t fp=0.; | |
159 | Double_t phiprev=0.; | |
bc231a12 | 160 | |
161 | for (Int_t i=0; i<maxNumberOfIterations; i++) | |
162 | { | |
163 | phiprev=fPhi; //store last value for comparison | |
164 | f = fPhi-phi0+v2*TMath::Sin(2.*(fPhi-reactionPlaneAngle)); | |
165 | fp = 1.0+2.0*v2*TMath::Cos(2.*(fPhi-reactionPlaneAngle)); //first derivative | |
166 | fPhi -= f/fp; | |
167 | if (TMath::AreEqualAbs(phiprev,fPhi,precisionPhi)) break; | |
168 | } | |
169 | } | |
170 | ||
171 | //----------------------------------------------------------------------- | |
172 | void AliFlowTrackSimple::AddV4( Double_t v4, | |
173 | Double_t reactionPlaneAngle, | |
174 | Double_t precisionPhi, | |
175 | Int_t maxNumberOfIterations ) | |
176 | { | |
177 | //afterburner, adds v4, uses Newton-Raphson iteration | |
178 | Double_t phi0=fPhi; | |
c855d803 | 179 | Double_t f=0.; |
180 | Double_t fp=0.; | |
181 | Double_t phiprev=0.; | |
bc231a12 | 182 | |
183 | for (Int_t i=0; i<maxNumberOfIterations; i++) | |
184 | { | |
185 | phiprev=fPhi; //store last value for comparison | |
186 | f = fPhi-phi0+0.5*v4*TMath::Sin(4.*(fPhi-reactionPlaneAngle)); | |
187 | fp = 1.0+2.0*v4*TMath::Cos(4.*(fPhi-reactionPlaneAngle)); //first derivative | |
188 | fPhi -= f/fp; | |
189 | if (TMath::AreEqualAbs(phiprev,fPhi,precisionPhi)) break; | |
190 | } | |
191 | } | |
192 | ||
193 | //______________________________________________________________________________ | |
194 | void AliFlowTrackSimple::AddFlow( Double_t v1, | |
195 | Double_t v2, | |
196 | Double_t v4, | |
197 | Double_t reactionPlaneAngle, | |
198 | Double_t precisionPhi, | |
199 | Int_t maxNumberOfIterations ) | |
200 | { | |
201 | //afterburner, adds v1,v2,v4 uses Newton-Raphson iteration | |
202 | Double_t phi0=fPhi; | |
c855d803 | 203 | Double_t f=0.; |
204 | Double_t fp=0.; | |
205 | Double_t phiprev=0.; | |
244c607a | 206 | |
207 | for (Int_t i=0; i<maxNumberOfIterations; i++) | |
208 | { | |
209 | phiprev=fPhi; //store last value for comparison | |
bc231a12 | 210 | f = fPhi-phi0 |
211 | +2.0*v1*TMath::Sin(fPhi-reactionPlaneAngle) | |
212 | + v2*TMath::Sin(2.*(fPhi-reactionPlaneAngle)) | |
213 | +0.5*v4*TMath::Sin(4.*(fPhi-reactionPlaneAngle)) | |
214 | ; | |
215 | fp = 1.0 | |
216 | +2.0*( | |
217 | +v1*TMath::Cos(fPhi-reactionPlaneAngle) | |
218 | +v2*TMath::Cos(2.*(fPhi-reactionPlaneAngle)) | |
219 | +v4*TMath::Cos(4.*(fPhi-reactionPlaneAngle)) | |
220 | ); //first derivative | |
244c607a | 221 | fPhi -= f/fp; |
222 | if (TMath::AreEqualAbs(phiprev,fPhi,precisionPhi)) break; | |
223 | } | |
7382279b | 224 | } |
bc231a12 | 225 | |
226 | //______________________________________________________________________________ | |
65ef7d1a | 227 | void AliFlowTrackSimple::Print( Option_t* /*option*/ ) const |
bc231a12 | 228 | { |
229 | //print stuff | |
44e060e0 | 230 | printf("Phi: %.3f, Eta: %+.3f, Pt: %.3f, weight: %.3f",fPhi,fEta,fPt,fTrackWeight); |
dd91b595 | 231 | if (InRPSelection()) printf(", RP"); |
232 | if (InPOISelection()) printf(", POI"); | |
233 | for (Int_t i=0; i<2; i++) | |
234 | { | |
235 | if (InSubevent(i)) printf(", subevent %i",i); | |
236 | } | |
237 | printf("\n"); | |
bc231a12 | 238 | } |