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Event.h
1 // Event.h is a part of the PYTHIA event generator.
2 // Copyright (C) 2012 Torbjorn Sjostrand.
3 // PYTHIA is licenced under the GNU GPL version 2, see COPYING for details.
4 // Please respect the MCnet Guidelines, see GUIDELINES for details.
5 
6 // Header file for the Particle and Event classes.
7 // Particle: information on an instance of a particle.
8 // Junction: information on a junction between three colours.
9 // Event: list of particles in the current event.
10 
11 #ifndef Pythia8_Event_H
12 #define Pythia8_Event_H
13 
14 #include "Basics.h"
15 #include "ParticleData.h"
16 #include "PythiaStdlib.h"
17 
18 namespace Pythia8 {
19 
20 //==========================================================================
21 
22 // Forward references to ParticleDataEntry and ResonanceWidths classes.
23 class ParticleDataEntry;
24 class ResonanceWidths;
25 
26 //==========================================================================
27 
28 // Particle class.
29 // This class holds info on a particle in general.
30 
31 class Particle {
32 
33 public:
34 
35  // Constructors.
36  Particle() : idSave(0), statusSave(0), mother1Save(0), mother2Save(0),
37  daughter1Save(0), daughter2Save(0), colSave(0), acolSave(0),
38  pSave(Vec4(0.,0.,0.,0.)), mSave(0.), scaleSave(0.), polSave(9.),
39  hasVertexSave(false), vProdSave(Vec4(0.,0.,0.,0.)), tauSave(0.),
40  pdePtr(0), pdtPtr(0) { }
41  Particle(int idIn, int statusIn = 0, int mother1In = 0,
42  int mother2In = 0, int daughter1In = 0, int daughter2In = 0,
43  int colIn = 0, int acolIn = 0, double pxIn = 0., double pyIn = 0.,
44  double pzIn = 0., double eIn = 0., double mIn = 0.,
45  double scaleIn = 0., double polIn = 9.)
46  : idSave(idIn), statusSave(statusIn), mother1Save(mother1In),
47  mother2Save(mother2In), daughter1Save(daughter1In),
48  daughter2Save(daughter2In), colSave(colIn), acolSave(acolIn),
49  pSave(Vec4(pxIn, pyIn, pzIn, eIn)), mSave(mIn), scaleSave(scaleIn),
50  polSave(polIn), hasVertexSave(false), vProdSave(Vec4(0.,0.,0.,0.)),
51  tauSave(0.), pdePtr(0), pdtPtr(0) { }
52  Particle(int idIn, int statusIn, int mother1In, int mother2In,
53  int daughter1In, int daughter2In, int colIn, int acolIn,
54  Vec4 pIn, double mIn = 0., double scaleIn = 0., double polIn = 9.)
55  : idSave(idIn), statusSave(statusIn), mother1Save(mother1In),
56  mother2Save(mother2In), daughter1Save(daughter1In),
57  daughter2Save(daughter2In), colSave(colIn), acolSave(acolIn),
58  pSave(pIn), mSave(mIn), scaleSave(scaleIn), polSave(polIn),
59  hasVertexSave(false), vProdSave(Vec4(0.,0.,0.,0.)), tauSave(0.),
60  pdePtr(0), pdtPtr(0) { }
61  Particle(const Particle& pt) : idSave(pt.idSave),
62  statusSave(pt.statusSave), mother1Save(pt.mother1Save),
63  mother2Save(pt.mother2Save), daughter1Save(pt.daughter1Save),
64  daughter2Save(pt.daughter2Save), colSave(pt.colSave),
65  acolSave(pt.acolSave), pSave(pt.pSave), mSave(pt.mSave),
66  scaleSave(pt.scaleSave), polSave(pt.polSave),
67  hasVertexSave(pt.hasVertexSave), vProdSave(pt.vProdSave),
68  tauSave(pt.tauSave), pdePtr(pt.pdePtr), pdtPtr(pt.pdtPtr) { }
69  Particle& operator=(const Particle& pt) {if (this != &pt) {
70  idSave = pt.idSave; statusSave = pt.statusSave;
71  mother1Save = pt.mother1Save; mother2Save = pt.mother2Save;
72  daughter1Save = pt.daughter1Save; daughter2Save = pt.daughter2Save;
73  colSave = pt.colSave; acolSave = pt.acolSave; pSave = pt.pSave;
74  mSave = pt.mSave; scaleSave = pt.scaleSave; polSave = pt.polSave;
75  hasVertexSave = pt.hasVertexSave; vProdSave = pt.vProdSave;
76  tauSave = pt.tauSave; pdePtr = pt.pdePtr; pdtPtr = pt.pdtPtr; }
77  return *this; }
78 
79  // Member functions to set the ParticleData and ParticleDataEntry pointers.
80  void setPDTPtr(ParticleData* pdtPtrIn) { pdtPtr = pdtPtrIn; setPDEPtr();}
81  void setPDEPtr() {pdePtr = (pdtPtr != nullptr )
82  ? pdtPtr->particleDataEntryPtr( idSave) : 0;}
83 
84  // Member functions for input.
85  void id(int idIn) {idSave = idIn; setPDEPtr();}
86  void status(int statusIn) {statusSave = statusIn;}
87  void statusPos() {statusSave = abs(statusSave);}
88  void statusNeg() {statusSave = -abs(statusSave);}
89  void statusCode(int statusIn) {statusSave =
90  (statusSave > 0) ? abs(statusIn) : -abs(statusIn);}
91  void mother1(int mother1In) {mother1Save = mother1In;}
92  void mother2(int mother2In) {mother2Save = mother2In;}
93  void mothers(int mother1In = 0, int mother2In = 0)
94  {mother1Save = mother1In; mother2Save = mother2In;}
95  void daughter1(int daughter1In) {daughter1Save = daughter1In;}
96  void daughter2(int daughter2In) {daughter2Save = daughter2In;}
97  void daughters(int daughter1In = 0, int daughter2In = 0)
98  {daughter1Save = daughter1In; daughter2Save = daughter2In;}
99  void col(int colIn) {colSave = colIn;}
100  void acol(int acolIn) {acolSave = acolIn;}
101  void cols(int colIn = 0,int acolIn = 0) {colSave = colIn;
102  acolSave = acolIn;}
103  void p(Vec4 pIn) {pSave = pIn;}
104  void p(double pxIn, double pyIn, double pzIn, double eIn)
105  {pSave.p(pxIn, pyIn, pzIn, eIn);}
106  void px(double pxIn) {pSave.px(pxIn);}
107  void py(double pyIn) {pSave.py(pyIn);}
108  void pz(double pzIn) {pSave.pz(pzIn);}
109  void e(double eIn) {pSave.e(eIn);}
110  void m(double mIn) {mSave = mIn;}
111  void scale(double scaleIn) {scaleSave = scaleIn;}
112  void pol(double polIn) {polSave = polIn;}
113  void vProd(Vec4 vProdIn) {vProdSave = vProdIn; hasVertexSave = true;}
114  void vProd(double xProdIn, double yProdIn, double zProdIn, double tProdIn)
115  {vProdSave.p(xProdIn, yProdIn, zProdIn, tProdIn); hasVertexSave = true;}
116  void xProd(double xProdIn) {vProdSave.px(xProdIn); hasVertexSave = true;}
117  void yProd(double yProdIn) {vProdSave.py(yProdIn); hasVertexSave = true;}
118  void zProd(double zProdIn) {vProdSave.pz(zProdIn); hasVertexSave = true;}
119  void tProd(double tProdIn) {vProdSave.e(tProdIn); hasVertexSave = true;}
120  void tau(double tauIn) {tauSave = tauIn;}
121 
122  // Member functions for output.
123  int id() const {return idSave;}
124  int status() const {return statusSave;}
125  int mother1() const {return mother1Save;}
126  int mother2() const {return mother2Save;}
127  int daughter1() const {return daughter1Save;}
128  int daughter2() const {return daughter2Save;}
129  int col() const {return colSave;}
130  int acol() const {return acolSave;}
131  Vec4 p() const {return pSave;}
132  double px() const {return pSave.px();}
133  double py() const {return pSave.py();}
134  double pz() const {return pSave.pz();}
135  double e() const {return pSave.e();}
136  double m() const {return mSave;}
137  double scale() const {return scaleSave;}
138  double pol() const {return polSave;}
139  bool hasVertex() const {return hasVertexSave;}
140  Vec4 vProd() const {return vProdSave;}
141  double xProd() const {return vProdSave.px();}
142  double yProd() const {return vProdSave.py();}
143  double zProd() const {return vProdSave.pz();}
144  double tProd() const {return vProdSave.e();}
145  double tau() const {return tauSave;}
146 
147  // Member functions for output; derived int and bool quantities.
148  int idAbs() const {return abs(idSave);}
149  int statusAbs() const {return abs(statusSave);}
150  bool isFinal() const {return (statusSave > 0);}
151  bool isRescatteredIncoming() const {return
152  (statusSave == -34 || statusSave == -45 ||
153  statusSave == -46 || statusSave == -54);}
154 
155  // Member functions for output; derived double quantities.
156  double m2() const {return (mSave >= 0.) ? mSave*mSave
157  : -mSave*mSave;}
158  double mCalc() const {return pSave.mCalc();}
159  double m2Calc() const {return pSave.m2Calc();}
160  double eCalc() const {return sqrt(abs(m2() + pSave.pAbs2()));}
161  double pT() const {return pSave.pT();}
162  double pT2() const {return pSave.pT2();}
163  double mT() const {double temp = m2() + pSave.pT2();
164  return (temp >= 0.) ? sqrt(temp) : -sqrt(-temp);}
165  double mT2() const {return m2() + pSave.pT2();}
166  double pAbs() const {return pSave.pAbs();}
167  double pAbs2() const {return pSave.pAbs2();}
168  double eT() const {return pSave.eT();}
169  double eT2() const {return pSave.eT2();}
170  double theta() const {return pSave.theta();}
171  double phi() const {return pSave.phi();}
172  double thetaXZ() const {return pSave.thetaXZ();}
173  double pPos() const {return pSave.pPos();}
174  double pNeg() const {return pSave.pNeg();}
175  double y() const;
176  double eta() const;
177  Vec4 vDec() const {return (tauSave > 0. && mSave > 0.)
178  ? vProdSave + tauSave * pSave / mSave : vProdSave;}
179  double xDec() const {return (tauSave > 0. && mSave > 0.)
180  ? vProdSave.px() + tauSave * pSave.px() / mSave : vProdSave.px();}
181  double yDec() const {return (tauSave > 0. && mSave > 0.)
182  ? vProdSave.py() + tauSave * pSave.py() / mSave : vProdSave.py();}
183  double zDec() const {return (tauSave > 0. && mSave > 0.)
184  ? vProdSave.pz() + tauSave * pSave.pz() / mSave : vProdSave.pz();}
185  double tDec() const {return (tauSave > 0. && mSave > 0.)
186  ? vProdSave.e() + tauSave * pSave.e() / mSave : vProdSave.e();}
187 
188  // Further output, based on a pointer to a ParticleDataEntry object.
189  string name() const {
190  return (pdePtr != nullptr) ? pdePtr->name(idSave) : " ";}
191  string nameWithStatus(int maxLen = 20) const;
192  int spinType() const {
193  return (pdePtr != nullptr) ? pdePtr->spinType() : 0;}
194  int chargeType() const {
195  return (pdePtr != nullptr) ? pdePtr->chargeType(idSave) : 0;}
196  double charge() const {
197  return (pdePtr != nullptr) ? pdePtr->charge(idSave) : 0;}
198  bool isCharged() const {
199  return (pdePtr != nullptr) ? (pdePtr->chargeType(idSave) != 0) : false;}
200  bool isNeutral() const {
201  return (pdePtr != nullptr) ? (pdePtr->chargeType(idSave) == 0) : false;}
202  int colType() const {
203  return (pdePtr != nullptr) ? pdePtr->colType(idSave) : 0;}
204  double m0() const {
205  return (pdePtr != nullptr) ? pdePtr->m0() : 0.;}
206  double mWidth() const {
207  return (pdePtr != nullptr) ? pdePtr->mWidth() : 0.;}
208  double mMin() const {
209  return (pdePtr != nullptr) ? pdePtr->mMin() : 0.;}
210  double mMax() const {
211  return (pdePtr != nullptr) ? pdePtr->mMax() : 0.;}
212  double mass() const {
213  return (pdePtr != nullptr) ? pdePtr->mass() : 0.;}
214  double constituentMass() const {
215  return (pdePtr != nullptr) ? pdePtr->constituentMass() : 0.;}
216  double tau0() const {
217  return (pdePtr != nullptr) ? pdePtr->tau0() : 0.;}
218  bool mayDecay() const {
219  return (pdePtr != nullptr) ? pdePtr->mayDecay() : false;}
220  bool canDecay() const {
221  return (pdePtr != nullptr) ? pdePtr->canDecay() : false;}
222  bool doExternalDecay() const {
223  return (pdePtr != nullptr) ? pdePtr->doExternalDecay() : false;}
224  bool isResonance() const {
225  return (pdePtr != nullptr) ? pdePtr->isResonance() : false;}
226  bool isVisible() const {
227  return (pdePtr != nullptr) ? pdePtr->isVisible() : false;}
228  bool isLepton() const {
229  return (pdePtr != nullptr) ? pdePtr->isLepton() : false;}
230  bool isQuark() const {
231  return (pdePtr != nullptr) ? pdePtr->isQuark() : false;}
232  bool isGluon() const {
233  return (pdePtr != nullptr) ? pdePtr->isGluon() : false;}
234  bool isDiquark() const {
235  return (pdePtr != nullptr) ? pdePtr->isDiquark() : false;}
236  bool isParton() const {
237  return (pdePtr != nullptr) ? pdePtr->isParton() : false;}
238  bool isHadron() const {
239  return (pdePtr != nullptr) ? pdePtr->isHadron() : false;}
240  ParticleDataEntry& particleDataEntry() const {return *pdePtr;}
241 
242  // Member functions that perform operations.
243  void rescale3(double fac) {pSave.rescale3(fac);}
244  void rescale4(double fac) {pSave.rescale4(fac);}
245  void rescale5(double fac) {pSave.rescale4(fac); mSave *= fac;}
246  void rot(double thetaIn, double phiIn) {pSave.rot(thetaIn, phiIn);
247  if (hasVertexSave) vProdSave.rot(thetaIn, phiIn);}
248  void bst(double betaX, double betaY, double betaZ) {
249  pSave.bst(betaX, betaY, betaZ);
250  if (hasVertexSave) vProdSave.bst(betaX, betaY, betaZ);}
251  void bst(double betaX, double betaY, double betaZ, double gamma) {
252  pSave.bst(betaX, betaY, betaZ, gamma);
253  if (hasVertexSave) vProdSave.bst(betaX, betaY, betaZ, gamma);}
254  void bst(const Vec4& pBst) {pSave.bst(pBst);
255  if (hasVertexSave) vProdSave.bst(pBst);}
256  void bst(const Vec4& pBst, double mBst) {pSave.bst(pBst, mBst);
257  if (hasVertexSave) vProdSave.bst(pBst, mBst);}
258  void bstback(const Vec4& pBst) {pSave.bstback(pBst);
259  if (hasVertexSave) vProdSave.bstback(pBst);}
260  void bstback(const Vec4& pBst, double mBst) {pSave.bstback(pBst, mBst);
261  if (hasVertexSave) vProdSave.bstback(pBst, mBst);}
262  void rotbst(const RotBstMatrix& M) {pSave.rotbst(M);
263  if (hasVertexSave) vProdSave.rotbst(M);}
264  void offsetHistory( int minMother, int addMother, int minDaughter,
265  int addDaughter);
266  void offsetCol( int addCol);
267 
268 private:
269 
270  // Constants: could only be changed in the code itself.
271  static const double TINY;
272 
273  // Properties of the current particle.
274  int idSave, statusSave, mother1Save, mother2Save, daughter1Save,
275  daughter2Save, colSave, acolSave;
276  Vec4 pSave;
277  double mSave, scaleSave, polSave;
278  bool hasVertexSave;
279  Vec4 vProdSave;
280  double tauSave;
281 
282  // Pointer to properties of the particle species.
283  // Should no be saved in a persistent copy of the event record.
284  // The //! below is ROOT notation that this member should not be saved.
285  // Event::restorePtrs() can be called to restore the missing information.
286  ParticleDataEntry* pdePtr;
287 
288  // Pointer to the whole particle data table. Used to update the above
289  // pointer when id(...) changes identity. As above it should not be saved.
290  ParticleData* pdtPtr;
291 
292 };
293 
294 // Invariant mass of a pair and its square.
295 // (Not part of class proper, but tightly linked.)
296 double m(const Particle&, const Particle&);
297 double m2(const Particle&, const Particle&);
298 
299 //==========================================================================
300 
301 // The junction class stores what kind of junction it is, the colour indices
302 // of the legs at the junction and as far out as legs have been traced,
303 // and the status codes assigned for fragmentation of each leg.
304 
305 class Junction {
306 
307 public:
308 
309  // Constructors.
310  Junction() : remainsSave(true), kindSave(0) {
311  for (int j = 0; j < 3; ++j) {
312  colSave[j] = 0; endColSave[j] = 0; statusSave[j] = 0; } }
313  Junction( int kindIn, int col0In, int col1In, int col2In)
314  : remainsSave(true), kindSave(kindIn) {colSave[0] = col0In;
315  colSave[1] = col1In; colSave[2] = col2In;
316  for (int j = 0; j < 3; ++j) {
317  endColSave[j] = colSave[j]; statusSave[j] = 0; } }
318  Junction(const Junction& ju) : remainsSave(ju.remainsSave),
319  kindSave(ju.kindSave) { for (int j = 0; j < 3; ++j) {
320  colSave[j] = ju.colSave[j]; endColSave[j] = ju.endColSave[j];
321  statusSave[j] = ju.statusSave[j]; } }
322  Junction& operator=(const Junction& ju) {if (this != &ju) {
323  remainsSave = ju.remainsSave; kindSave = ju.kindSave;
324  for (int j = 0; j < 3; ++j) { colSave[j] = ju.colSave[j];
325  endColSave[j] = ju.endColSave[j]; statusSave[j] = ju.statusSave[j]; } }
326  return *this; }
327 
328  // Set values.
329  void remains(bool remainsIn) {remainsSave = remainsIn;}
330  void col(int j, int colIn) {colSave[j] = colIn; endColSave[j] = colIn;}
331  void cols(int j, int colIn, int endColIn) {colSave[j] = colIn;
332  endColSave[j] = endColIn;}
333  void endCol(int j, int endColIn) {endColSave[j] = endColIn;}
334  void status(int j, int statusIn) {statusSave[j] = statusIn;}
335 
336  // Read out value.
337  bool remains() const {return remainsSave;}
338  int kind() const {return kindSave;}
339  int col(int j) const {return colSave[j];}
340  int endCol(int j) const {return endColSave[j];}
341  int status(int j) const {return statusSave[j];}
342 
343 private:
344 
345  // Kind, positions of the three ends and their status codes.
346  bool remainsSave;
347  int kindSave, colSave[3], endColSave[3], statusSave[3];
348 
349 };
350 
351 //==========================================================================
352 
353 // The Event class holds all info on the generated event.
354 
355 class Event {
356 
357 public:
358 
359  // Constructors.
360  Event(int capacity = 100) {entry.reserve(capacity); startColTag = 100;
361  headerList = "----------------------------------------";
362  particleDataPtr = 0;}
363  Event& operator=(const Event& oldEvent);
364 
365  // Initialize header for event listing, particle data table, and colour.
366  void init( string headerIn = "", ParticleData* particleDataPtrIn = 0,
367  int startColTagIn = 100) {
368  headerList.replace(0, headerIn.length() + 2, headerIn + " ");
369  particleDataPtr = particleDataPtrIn; startColTag = startColTagIn;}
370 
371  // Clear event record.
372  void clear() {entry.resize(0); maxColTag = startColTag; scaleSave = 0.;
373  scaleSecondSave = 0.; clearJunctions();}
374 
375  // Clear event record, and set first particle empty.
376  void reset() {clear(); append(90, -11, 0, 0, 0., 0., 0., 0., 0.);}
377 
378  // Overload index operator to access element of event record.
379  Particle& operator[](int i) {return entry[i];}
380  const Particle& operator[](int i) const {return entry[i];}
381 
382  // Other way to access an element of event record.
383  Particle& at(int i) {return entry.at(i);}
384 
385  // Event record size.
386  int size() const {return entry.size();}
387 
388  // Put a new particle at the end of the event record; return index.
389  int append(Particle entryIn) {
390  entry.push_back(entryIn); setPDTPtr();
391  if (entryIn.col() > maxColTag) maxColTag = entryIn.col();
392  if (entryIn.acol() > maxColTag) maxColTag = entryIn.acol();
393  return entry.size() - 1;
394  }
395  int append(int id, int status, int mother1, int mother2, int daughter1,
396  int daughter2, int col, int acol, double px, double py, double pz,
397  double e, double m = 0., double scaleIn = 0., double polIn = 9.) {
398  entry.push_back( Particle(id, status, mother1, mother2, daughter1,
399  daughter2, col, acol, px, py, pz, e, m, scaleIn, polIn) ); setPDTPtr();
400  if (col > maxColTag) maxColTag = col;
401  if (acol > maxColTag) maxColTag = acol;
402  return entry.size() - 1;
403  }
404  int append(int id, int status, int mother1, int mother2, int daughter1,
405  int daughter2, int col, int acol, Vec4 p, double m = 0.,
406  double scaleIn = 0., double polIn = 9.) {
407  entry.push_back( Particle(id, status, mother1, mother2, daughter1,
408  daughter2, col, acol, p, m, scaleIn, polIn) ); setPDTPtr();
409  if (col > maxColTag) maxColTag = col;
410  if (acol > maxColTag) maxColTag = acol;
411  return entry.size() - 1;
412  }
413 
414  // Brief versions of append: no mothers and no daughters.
415  int append(int id, int status, int col, int acol, double px, double py,
416  double pz, double e, double m = 0., double scaleIn = 0.,
417  double polIn = 9.) { entry.push_back( Particle(id, status, 0, 0, 0, 0,
418  col, acol, px, py, pz, e, m, scaleIn, polIn) ); setPDTPtr();
419  if (col > maxColTag) maxColTag = col;
420  if (acol > maxColTag) maxColTag = acol;
421  return entry.size() - 1;
422  }
423  int append(int id, int status, int col, int acol, Vec4 p, double m = 0.,
424  double scaleIn = 0., double polIn = 9.) {entry.push_back( Particle(id,
425  status, 0, 0, 0, 0, col, acol, p, m, scaleIn, polIn) ); setPDTPtr();
426  if (col > maxColTag) maxColTag = col;
427  if (acol > maxColTag) maxColTag = acol;
428  return entry.size() - 1;
429  }
430 
431  // Set pointer to ParticleData for a particle, by default latest one.
432  void setPDTPtr(int iSet = -1) {if (iSet < 0) iSet = entry.size() - 1;
433  entry[iSet].setPDTPtr( particleDataPtr);}
434 
435  // Add a copy of an existing particle at the end of the event record.
436  int copy(int iCopy, int newStatus = 0);
437 
438  // Implement reference "back" to access last element.
439  Particle& back() {return entry.back();}
440 
441  // List the particles in an event.
442  void list() const;
443  void list(ostream& os) const;
444  void list(bool showScaleAndVertex, bool showMothersAndDaughters = false)
445  const;
446  void list(bool showScaleAndVertex, bool showMothersAndDaughters,
447  ostream& os) const;
448 
449  // Remove last n entries.
450  void popBack(int nRemove = 1) { if (nRemove ==1) entry.pop_back();
451  else {int newSize = max( 0, size() - nRemove);
452  entry.resize(newSize);} }
453 
454  // Restore all ParticleDataEntry* pointers in the Particle vector.
455  // Useful when a persistent copy of the event record is read back in.
456  void restorePtrs() { for (int i = 0; i < size(); ++i) setPDTPtr(i); }
457 
458  // Save or restore the size of the event record (throwing at the end).
459  void saveSize() {savedSize = entry.size();}
460  void restoreSize() {entry.resize(savedSize);}
461 
462  // Initialize and access colour tag information.
463  void initColTag(int colTag = 0) {maxColTag = max( colTag,startColTag);}
464  int lastColTag() const {return maxColTag;}
465  int nextColTag() {return ++maxColTag;}
466 
467  // Access scale for which event as a whole is defined.
468  void scale( double scaleIn) {scaleSave = scaleIn;}
469  double scale() const {return scaleSave;}
470 
471  // Need a second scale if two hard interactions in event.
472  void scaleSecond( double scaleSecondIn) {scaleSecondSave = scaleSecondIn;}
473  double scaleSecond() const {return scaleSecondSave;}
474 
475  // Find complete list of daughters and mothers.
476  vector<int> motherList(int i) const;
477  vector<int> daughterList(int i) const;
478 
479  // Convert to HepMC status code conventions.
480  int statusHepMC(int i) const;
481 
482  // Trace the first and last copy of one and the same particle.
483  int iTopCopy(int i) const;
484  int iBotCopy(int i) const;
485 
486  // Trace the first and last copy of a particle, using flavour match.
487  int iTopCopyId(int i) const;
488  int iBotCopyId(int i) const;
489 
490  // Find list of sisters, also tracking up and down identical copies.
491  vector<int> sisterList(int i) const;
492  vector<int> sisterListTopBot(int i, bool widenSearch = true) const;
493 
494  // Check whether two particles have a direct mother-daughter relation.
495  bool isAncestor(int i, int iAncestor) const;
496 
497  // Member functions for rotations and boosts of an event.
498  void rot(double theta, double phi)
499  {for (int i = 0; i < size(); ++i) entry[i].rot(theta, phi);}
500  void bst(double betaX, double betaY, double betaZ)
501  {for (int i = 0; i < size(); ++i) entry[i].bst(betaX, betaY, betaZ);}
502  void bst(double betaX, double betaY, double betaZ, double gamma)
503  {for (int i = 0; i < size(); ++i) entry[i].bst(betaX, betaY, betaZ,
504  gamma);}
505  void bst(const Vec4& vec)
506  {for (int i = 0; i < size(); ++i) entry[i].bst(vec);}
507  void rotbst(const RotBstMatrix& M)
508  {for (int i = 0; i < size(); ++i) entry[i].rotbst(M);}
509 
510  // Clear the list of junctions.
511  void clearJunctions() {junction.resize(0);}
512 
513  // Add a junction to the list, study it or extra input.
514  void appendJunction( int kind, int col0, int col1, int col2)
515  { junction.push_back( Junction( kind, col0, col1, col2) );}
516  void appendJunction(Junction junctionIn) {junction.push_back(junctionIn);}
517  int sizeJunction() const {return junction.size();}
518  bool remainsJunction(int i) const {return junction[i].remains();}
519  void remainsJunction(int i, bool remainsIn) {junction[i].remains(remainsIn);}
520  int kindJunction(int i) const {return junction[i].kind();}
521  int colJunction( int i, int j) const {return junction[i].col(j);}
522  void colJunction( int i, int j, int colIn) {junction[i].col(j, colIn);}
523  int endColJunction( int i, int j) const {return junction[i].endCol(j);}
524  void endColJunction( int i, int j, int endColIn)
525  {junction[i].endCol(j, endColIn);}
526  int statusJunction( int i, int j) const {return junction[i].status(j);}
527  void statusJunction( int i, int j, int statusIn)
528  {junction[i].status(j, statusIn);}
529  Junction& getJunction(int i) {return junction[i];}
530  const Junction& getJunction(int i) const {return junction[i];}
531  void eraseJunction(int i);
532 
533  // Save or restore the size of the junction list (throwing at the end).
534  void saveJunctionSize() {savedJunctionSize = junction.size();}
535  void restoreJunctionSize() {junction.resize(savedJunctionSize);}
536 
537  // List any junctions in the event; for debug mainly.
538  void listJunctions(ostream& os = cout) const;
539 
540  // Operator overloading allows to append one event to an existing one.
541  // Warning: particles should be OK, but some other information unreliable.
542  Event& operator+=(const Event& addEvent);
543 
544 private:
545 
546  // Constants: could only be changed in the code itself.
547  static const int IPERLINE;
548 
549  // Initialization data, normally only set once.
550  int startColTag;
551 
552  // The event: a vector containing all particles (entries).
553  // The explicit use of Pythia8:: qualifier patches a limitation in ROOT.
554  vector<Pythia8::Particle> entry;
555 
556  // The list of junctions.
557  // The explicit use of Pythia8:: qualifier patches a limitation in ROOT.
558  vector<Pythia8::Junction> junction;
559 
560  // The maximum colour tag of the event so far.
561  int maxColTag;
562 
563  // Saved entry and junction list sizes, for simple restoration.
564  int savedSize, savedJunctionSize;
565 
566  // The scale of the event; linear quantity in GeV.
567  double scaleSave, scaleSecondSave;
568 
569  // Header specification in event listing (at most 40 characters wide).
570  string headerList;
571 
572  // Pointer to the particle data table.
573  // The //! below is ROOT notation that this member should not be saved.
574  ParticleData* particleDataPtr;
575 
576 };
577 
578 //==========================================================================
579 
580 } // end namespace Pythia8
581 
582 #endif // end Pythia8_Event_H
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