ATLAS Offline Software
AlphaBetaEstimate.cxx
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1 /*
2  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
3 */
4 
5 #include "AlphaBetaEstimate.h"
6 
7 #include <cmath>
8 
9 #include "xAODTrigMuon/TrigMuonDefs.h"
10 
11 #include "AthenaBaseComps/AthMsgStreamMacros.h"
12 
13 
14 // --------------------------------------------------------------------------------
15 // --------------------------------------------------------------------------------
16 
17 TrigL2MuonSA::AlphaBetaEstimate::AlphaBetaEstimate(const std::string& type,
18  const std::string& name,
19  const IInterface* parent):
20  AthAlgTool(type, name, parent)
21 {
22 }
23 
24 // --------------------------------------------------------------------------------
25 // --------------------------------------------------------------------------------
26 
27 void TrigL2MuonSA::AlphaBetaEstimate::setMCFlag(bool use_mcLUT,
28  const TrigL2MuonSA::PtEndcapLUTSvc* ptEndcapLUTSvc)
29 {
30  m_use_mcLUT = use_mcLUT;
31  m_ptEndcapLUT = ptEndcapLUTSvc->ptEndcapLUT();
32 }
33 
34 // --------------------------------------------------------------------------------
35 // --------------------------------------------------------------------------------
36 
37 StatusCode TrigL2MuonSA::AlphaBetaEstimate::setAlphaBeta(const TrigRoiDescriptor* p_roids,
38  TrigL2MuonSA::TgcFitResult& tgcFitResult,
39  TrigL2MuonSA::TrackPattern& trackPattern,
40  const TrigL2MuonSA::MuonRoad& /*muonRoad*/) const
41 {
42  const int MAX_STATION = 6;
43  const double PHI_RANGE = 12./(M_PI/8.);
44 
45  // computing ALPHA, BETA and RADIUS
46  float InnerSlope = 0;
47  float MiddleSlope = 0;
48  float MiddleIntercept = 0;
49  float InnerR = 0;
50  float InnerZ = 0;
51  float EER = 0;//ee
52  float EEZ = 0;//ee
53  float MiddleR = 0;
54  float MiddleZ = 0;
55  float OuterR = 0;
56  float OuterZ = 0;
57  float EBIR = 0;//endcap barrel inner
58  float EBIZ = 0;//endcap barrel inner
59  // float CSCSlope = 0;//csc currrently not used for gamma-pt
60  float CSCR = 0;//csc
61  float CSCZ = 0;//csc
62 
63  // set etaMap and phi
64  double phi = 0.;
65  double phim = 0.;
66 
67  TrigL2MuonSA::SuperPoint* superPoint;
68 
69  for (int i_station=0; i_station<MAX_STATION; i_station++) {
70 
71  int chamber = 0;
72  if ( i_station == 0 ) chamber = xAOD::L2MuonParameters::Chamber::EndcapInner;
73  if ( i_station == 1 ) chamber = xAOD::L2MuonParameters::Chamber::EndcapMiddle;
74  if ( i_station == 2 ) chamber = xAOD::L2MuonParameters::Chamber::EndcapOuter;
75  if ( i_station == 3 ) chamber = xAOD::L2MuonParameters::Chamber::EndcapExtra;
76  if ( i_station == 4 ) chamber = xAOD::L2MuonParameters::Chamber::BarrelInner;
77  if ( i_station == 5 ) chamber = xAOD::L2MuonParameters::Chamber::CSC;
78  superPoint = &(trackPattern.superPoints[chamber]);
79 
80  if ( superPoint->Npoint > 2 && superPoint->R > 0.) {
81  if (chamber==3) {
82  InnerSlope = superPoint->Alin;
83  InnerR = superPoint->R;
84  InnerZ = superPoint->Z;
85  } if ( chamber==4 ) {
86  MiddleSlope = superPoint->Alin;
87  MiddleIntercept = superPoint->R - MiddleSlope*superPoint->Z;
88  MiddleR = superPoint->R;
89  MiddleZ = superPoint->Z;
90  } if ( chamber==5 ) {
91  OuterR = superPoint->R;
92  OuterZ = superPoint->Z;
93  } if ( chamber==6 ) {
94  EER = superPoint->R;
95  EEZ = superPoint->Z;
96  } if ( chamber==0 ) {//barrel inner
97  EBIR = superPoint->R;
98  EBIZ = superPoint->Z;
99  } if ( chamber==7 ) {//csc
100  //CSCSlope = superPoint->Alin; //currently not used
101  CSCR = superPoint->R;
102  CSCZ = superPoint->Z;
103  }
104  phim = superPoint->Phim;
105  }
106  } // end loop for stations
107 
108  if (tgcFitResult.isSuccess) {
109  // TGC data properly read
110 
111  double phi1 = tgcFitResult.tgcMid1[1];
112  double phi2 = tgcFitResult.tgcMid2[1];
113  if ( isZero(tgcFitResult.tgcMid1[3]) || isZero(tgcFitResult.tgcMid2[3]) ) {
114  if ( !isZero(tgcFitResult.tgcMid1[3]) ) phi = phi1;
115  if ( !isZero(tgcFitResult.tgcMid2[3]) ) phi = phi2;
116  } else if( phi1*phi2 < 0 && std::abs(phi1)>(M_PI/2.) ) {
117  double tmp1 = (phi1>0)? phi1 - M_PI : phi1 + M_PI;
118  double tmp2 = (phi2>0)? phi2 - M_PI : phi2 + M_PI;
119  double tmp = (tmp1+tmp2)/2.;
120  phi = (tmp>0.)? tmp - M_PI : tmp + M_PI;
121  } else {
122  phi = (phi2+phi1)/2.;
123  }
124 
125  if ( isZero(MiddleZ) ) {
126  if ( !isZero(tgcFitResult.tgcMid1[0]) && !isZero(tgcFitResult.tgcMid2[0]) ) {
127  trackPattern.etaMap = (tgcFitResult.tgcMid1[0]+tgcFitResult.tgcMid2[0])/2;
128  } else {
129  trackPattern.etaMap = (tgcFitResult.tgcMid1[0]!=0)?
130  tgcFitResult.tgcMid1[0] : tgcFitResult.tgcMid2[0];
131  }
132  }
133 
134  double etaInner = 0.;
135  double etaMiddle = 0.;
136  if ( !isZero(MiddleZ) ) {
137  double theta = std::atan(MiddleR/std::abs(MiddleZ));
138  etaMiddle = -std::log(std::tan(theta/2.))*MiddleZ/std::abs(MiddleZ);
139  }
140 
141  if ( !isZero(InnerZ) ) {
142  double theta = std::atan(InnerR/std::abs(InnerZ));
143  etaInner = -std::log(std::tan(theta/2.))*InnerZ/std::abs(InnerZ);
144  }
145 
146  if ( !isZero(MiddleZ) ) trackPattern.etaMap = etaMiddle;
147  else if ( !isZero(InnerZ) ) trackPattern.etaMap = etaInner;
148  if ( !isZero(tgcFitResult.tgcInn[3]) ) phi = tgcFitResult.tgcInn[1];
149 
150  if ( phim > M_PI+0.1 ) phim = phim - 2*M_PI;
151  if ( phim >= 0 ) trackPattern.phiMap = (phi>=0.)? phi - phim : phim - std::abs(phi);
152  else trackPattern.phiMap = phi - phim;
153 
154  int Octant = (int)(tgcFitResult.tgcMid1[1] / (M_PI/4.));
155  double PhiInOctant = std::abs(tgcFitResult.tgcMid1[1] - Octant * (M_PI/4.));
156  if (PhiInOctant > (M_PI/8.)) PhiInOctant = (M_PI/4.) - PhiInOctant;
157 
158  trackPattern.endcapBeta = 0.0;
159  trackPattern.phiMS = phi;
160  trackPattern.pt = std::abs(tgcFitResult.tgcPT);
161  trackPattern.charge = (tgcFitResult.tgcPT!=0.0)? tgcFitResult.tgcPT/std::abs(tgcFitResult.tgcPT) : +1;
162 
163  trackPattern.phiBin = static_cast<int>(PhiInOctant * PHI_RANGE);
164  trackPattern.etaBin = static_cast<int>((std::abs(tgcFitResult.tgcMid1[0])-1.)/0.05);
165 
166  double phiEE = (tgcFitResult.tgcMid1[1]>0) ? tgcFitResult.tgcMid1[1] : tgcFitResult.tgcMid1[1] + 2*M_PI;
167  trackPattern.phiBinEE = static_cast<int> (phiEE*96/M_PI);
168 
169  } else {
170  // TGC data readout problem -> use RoI (eta, phi) and assume straight track
171 
172  trackPattern.etaMap = p_roids->eta();
173  phi = p_roids->phi();
174 
175  if ( phim > M_PI+0.1 ) phim = phim - 2*M_PI;
176  if ( phim >= 0 ) trackPattern.phiMap = (phi>=0.)? phi - phim : phim - std::abs(phi);
177  else trackPattern.phiMap = phi - phim;
178 
179  int Octant = (int)(p_roids->phi() / (M_PI/4.));
180  double PhiInOctant = std::abs(p_roids->phi() - Octant * (M_PI/4.));
181  if (PhiInOctant > (M_PI/8.)) PhiInOctant = (M_PI/4.) - PhiInOctant;
182 
183  trackPattern.endcapBeta = 0.0;
184  trackPattern.phiMS = phi;
185  trackPattern.pt = 0;
186  trackPattern.charge = 0;
187 
188  trackPattern.phiBin = static_cast<int>(PhiInOctant * PHI_RANGE);
189  trackPattern.etaBin = static_cast<int>((std::abs(p_roids->eta())-1.)/0.05);
190 
191  double phiEE = (p_roids->phi()>0) ? p_roids->phi() : p_roids->phi() + 2*M_PI;
192  trackPattern.phiBinEE = static_cast<int> (phiEE*96/M_PI);
193 
194  }
195 
196  if (!isZero(MiddleZ) && !isZero(OuterZ)) {
197  double slope = (OuterR-MiddleR)/(OuterZ-MiddleZ);
198  double inter = MiddleR - slope*MiddleZ;
199 
200  trackPattern.endcapAlpha = (*m_ptEndcapLUT)->alpha(MiddleZ,MiddleR,OuterZ,OuterR);
201  trackPattern.slope = slope;
202  trackPattern.intercept = inter;
203  if (!isZero(InnerR)) {
204  trackPattern.endcapBeta = std::abs( std::atan(InnerSlope) - std::atan(slope) );
205  trackPattern.deltaR = slope * InnerZ + MiddleIntercept - InnerR;
206  double sign = trackPattern.deltaR / std::abs(trackPattern.deltaR);
207  trackPattern.endcapRadius = computeRadius(InnerSlope, InnerR, InnerZ,
208  slope, MiddleR, MiddleZ,
209  sign);
210  }
211  if (!isZero(CSCZ)) {
212  if(trackPattern.large_dPhidZ && (6==trackPattern.phiBin || 7==trackPattern.phiBin) ){
213  trackPattern.cscGamma = std::abs( std::atan( (MiddleR-CSCR)/(MiddleZ-CSCZ) ) - std::atan(MiddleSlope) );
214  }else{
215  double OuterR_modified=OuterR*trackPattern.outerCorFactor;//assume dphidz=0
216  double slope_modified=(OuterR_modified-MiddleR)/(OuterZ-MiddleZ);
217  trackPattern.cscGamma = std::abs( std::atan( (MiddleR-CSCR)/(MiddleZ-CSCZ) ) - std::atan(slope_modified) );
218  ATH_MSG_DEBUG("OuterR_modified=" << OuterR_modified << " slope_modified=" << slope_modified);
219  }
220  }
221  } else {
222  if( trackPattern.pt >= 8. || !tgcFitResult.isSuccess) {
223  if(!isZero(MiddleZ)) {
224  double Ze = MiddleZ+(std::abs(MiddleZ)/MiddleZ)*1000.;
225  double Re = MiddleSlope*(Ze) + MiddleIntercept;
226 
227  trackPattern.endcapAlpha = (*m_ptEndcapLUT)->alpha(MiddleZ,MiddleR,Ze,Re);
228  trackPattern.slope = MiddleSlope;
229  trackPattern.intercept = MiddleIntercept;
230  }
231  }
232 
233  if (!isZero(MiddleZ) && !isZero(InnerZ)) {
234  trackPattern.endcapBeta = std::abs( std::atan(InnerSlope) - std::atan(MiddleSlope) );
235  trackPattern.deltaR = MiddleSlope*InnerZ + MiddleIntercept - InnerR;
236  double sign = trackPattern.deltaR / std::abs(trackPattern.deltaR);
237  trackPattern.endcapRadius = computeRadius(InnerSlope, InnerR, InnerZ,
238  MiddleSlope, MiddleR, MiddleZ,
239  sign);
240  }
241  if(!isZero(MiddleZ) && !isZero(CSCZ)){
242  trackPattern.cscGamma = std::abs( std::atan( (MiddleR-CSCR)/(MiddleZ-CSCZ) ) - std::atan(MiddleSlope) );
243  }
244  }
245 
246  double distance=9999;//distance between track and IP
247  if (std::abs(EEZ)>10000 && std::abs(EEZ)<10600){//Small
248  if ( (!isZero(EBIZ) && !isZero(EEZ)) && !isZero(MiddleZ) ){
249  trackPattern.endcapRadius3P = computeRadius3Points(EBIZ, EBIR, EEZ, EER, MiddleZ, MiddleR);
250  distance = calcDistance(EBIZ, EBIR, EEZ, EER, MiddleZ, MiddleR);
251  }
252  }
253  if (std::abs(EEZ)>10600 && std::abs(EEZ)<12000){//Large
254  if ( (!isZero(InnerZ) && !isZero(EEZ)) && !isZero(MiddleZ) ){
255  trackPattern.endcapRadius3P = computeRadius3Points(InnerZ, InnerR, EEZ, EER, MiddleZ, MiddleR);
256  distance = calcDistance(InnerZ, InnerR, EEZ, EER, MiddleZ, MiddleR);
257  }
258  }
259  if (distance>500) trackPattern.endcapRadius3P=0;//Reconstruction may fail
260 
261  ATH_MSG_DEBUG("... alpha/beta/endcapRadius/cscGamma/charge/s_address="
262  << trackPattern.endcapAlpha << "/" << trackPattern.endcapBeta << "/" << trackPattern.endcapRadius3P << "/"
263  << trackPattern.cscGamma << "/" << trackPattern.charge << "/" << trackPattern.s_address );
264  //
265  return StatusCode::SUCCESS;
266 }
267 
268 // --------------------------------------------------------------------------------
269 // --------------------------------------------------------------------------------
270 
271 double TrigL2MuonSA::AlphaBetaEstimate::computeRadius(double InnerSlope, double InnerR, double InnerZ,
272  double MiddleSlope, double MiddleR, double MiddleZ,
273  double sign) const
274 {
275  double cr1 = 0.080/400;
276  double cr2 = cr1;
277  double x1 = InnerZ;
278  if (std::abs(x1)>=0.1) {
279  double x2 = MiddleZ;
280  double y1 = InnerR;
281  double y2 = MiddleR;
282  double A1 = InnerSlope;
283  double A2 = MiddleSlope;
284  if (!(std::abs(MiddleSlope+999)<0.1)) {
285  A2 = MiddleSlope;
286  cr2 = cr1/10;
287  }
288 
289  // find centre of circonference
290  double xm = (x1+x2)/2.;
291  double ym = (y1+y2)/2.;
292  double c1 = (x2-x1)*xm+(y2-y1)*ym;
293  double c2_1 = -x1-A1*y1;
294  double c2_2 = -x2-A2*y2;
295  double yR1 = (-c1-c2_1*(x2-x1))/(A1*(x2-x1)-(y2-y1));
296  double yR2 = (-c1-c2_2*(x2-x1))/(A2*(x2-x1)-(y2-y1));
297  double xR1 = -A1*yR1-c2_1;
298  double xR2 = -A2*yR2-c2_2;
299 
300  double xR = ((1./cr1)*xR1+(1./cr2)*xR2)/((1./cr1)+(1./cr2));
301  double yR = ((1./cr1)*yR1+(1./cr2)*yR2)/((1./cr1)+(1./cr2));
302  double radius = 0.5*(std::sqrt((xR-x1)*(xR-x1)+(yR-y1)*(yR-y1))+std::sqrt((xR-x2)*(xR-x2)+(yR-y2)*(yR-y2)));
303  return sign * radius;
304  }
305 
306  return 0.;
307 }
308 
309 double TrigL2MuonSA::AlphaBetaEstimate::computeRadius3Points(double InnerZ, double InnerR,
310  double EEZ, double EER,
311  double MiddleZ, double MiddleR)
312 const {
313  double radius_EE;
314 
315  double a3;
316 
317  double m = 0.;
318  double cost = 0.;
319  double x0 = 0., y0 = 0., x2 = 0., y2 = 0., x3 = 0., y3 = 0.;
320  double tm = 0.;
321 
322  a3 = ( MiddleZ - InnerZ ) / ( MiddleR - InnerR );
323 
324  m = a3;
325  cost = std::cos(std::atan(m));
326  x2 = EER - InnerR;
327  y2 = EEZ - InnerZ;
328  x3 = MiddleR - InnerR;
329  y3 = MiddleZ - InnerZ;
330 
331  tm = x2;
332  x2 = ( x2 + y2*m)*cost;
333  y2 = (-tm*m + y2 )*cost;
334 
335  tm = x3;
336  x3 = ( x3 + y3*m)*cost;
337  y3 = (-tm*m + y3 )*cost;
338 
339  x0 = x3/2.;
340  y0 = (y2*y2 + x2*x2 -x2*x3)/(2*y2);
341 
342  radius_EE = std::sqrt(x0*x0 + y0*y0);
343  return radius_EE;
344 }
345 
346 double TrigL2MuonSA::AlphaBetaEstimate::calcDistance(double x1,double y1,double x2,double y2,double x3,double y3) const {
347  double xm1=(x1+x2)/2;
348  double xm2=(x2+x3)/2;
349  double ym1=(y1+y2)/2;
350  double ym2=(y2+y3)/2;
351  double a1=(x1-x2)/(y2-y1);
352  double a2=(x2-x3)/(y3-y2);
353  double x0=(a2*xm2-a1*xm1-ym2+ym1)/(a2-a1);//center of circle
354  double y0=a1*(x0-xm1)+ym1;//center of circle
355  double a = (x0-x1)/(y1-y0);//slope of sessen
356  double b = y1+x1*(x1-x0)/(y1-y0);//intercept of sessen
357  double d=std::abs(b)/std::sqrt(a*a+1);
358  return d;
359 }
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@ EndcapInner
Inner station in the endcap spectrometer.
Definition: TrigMuonDefs.h:19
TrigL2MuonSA::SuperPoint::Npoint
int Npoint
Definition: SuperPointData.h:53
TrigL2MuonSA::TrackPattern::etaMap
double etaMap
Definition: TrackData.h:77
TrigL2MuonSA::TrackPattern::phiBinEE
int phiBinEE
Definition: TrackData.h:82
python.CaloCondTools.log
log
Definition: CaloCondTools.py:20
RoiDescriptor::eta
virtual double eta() const override final
Definition: RoiDescriptor.h:101
TrigL2MuonSA::SuperPoint::Z
float Z
Definition: SuperPointData.h:56
TrigL2MuonSA::SuperPoint
Definition: SuperPointData.h:38
CSC
@ CSC
Definition: RegSelEnums.h:34
AthAlgTool
Definition: AthAlgTool.h:26
TrigL2MuonSA::TrackPattern::endcapRadius
double endcapRadius
Definition: TrackData.h:89
Amg::distance
float distance(const Amg::Vector3D &p1, const Amg::Vector3D &p2)
calculates the distance between two point in 3D space
Definition: GeoPrimitivesHelpers.h:54
TrigL2MuonSA::SuperPoint::Alin
float Alin
Definition: SuperPointData.h:58
xAOD::L2MuonParameters::EndcapOuter
@ EndcapOuter
Outer station in the endcap spectrometer.
Definition: TrigMuonDefs.h:21
python.SystemOfUnits.m
float m
Definition: SystemOfUnits.py:106
TrigL2MuonSA::TrackPattern::endcapAlpha
double endcapAlpha
Definition: TrackData.h:87
TrigL2MuonSA::PtEndcapLUTSvc
Definition: PtEndcapLUTSvc.h:20
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