3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
10 // Generator using the TPythia interface (via AliPythia)
11 // to generate pp collisions.
12 // Using SetNuclei() also nuclear modifications to the structure functions
13 // can be taken into account. This makes, of course, only sense for the
14 // generation of the products of hard processes (heavy flavor, jets ...)
16 // andreas.morsch@cern.ch
20 #include "AliPythia.h"
24 class AliGenPythiaEventHeader;
25 class AliGenEventHeader;
30 class AliGenPythia : public AliGenMC
34 typedef enum {kFlavorSelection, kParentSelection, kHeavyFlavor} StackFillOpt_t;
35 typedef enum {kCountAll, kCountParents, kCountTrackables} CountMode_t;
36 typedef enum {kCluster, kCell} JetRecMode_t;
39 AliGenPythia(Int_t npart);
40 virtual ~AliGenPythia();
41 virtual void Generate();
43 // Range of events to be printed
44 virtual void SetEventListRange(Int_t eventFirst=-1, Int_t eventLast=-1);
45 // Select process type
46 virtual void SetProcess(Process_t proc = kPyCharm) {fProcess = proc;}
47 virtual void SetTune(Int_t itune) {fItune = itune;}
49 // Select structure function
50 virtual void SetStrucFunc(StrucFunc_t func = kCTEQ5L) {fStrucFunc = func;}
51 // Select pt of hard scattering
52 virtual void SetPtHard(Float_t ptmin = 0, Float_t ptmax = 1.e10)
53 {fPtHardMin = ptmin; fPtHardMax = ptmax; }
54 // y of hard scattering
55 virtual void SetYHard(Float_t ymin = -1.e10, Float_t ymax = 1.e10)
56 {fYHardMin = ymin; fYHardMax = ymax; }
57 // Set initial and final state gluon radiation
58 virtual void SetGluonRadiation(Int_t iIn, Int_t iFin)
59 {fGinit = iIn; fGfinal = iFin;}
61 virtual void SetPtKick(Float_t kt = 1.)
63 // Use the Pythia 6.3 new multiple interations scenario
64 virtual void UseNewMultipleInteractionsScenario() {fNewMIS = kTRUE;}
65 // Switch off heavy flavors
66 virtual void SwitchHFOff() {fHFoff = kTRUE;}
67 // Set centre of mass energy
68 virtual void SetEnergyCMS(Float_t energy = 5500) {fEnergyCMS = energy;}
69 // Treat protons as inside nuclei with mass numbers a1 and a2
70 virtual void SetNuclei(Int_t a1, Int_t a2, Int_t pdfset = 0);
71 // Set colliding nuclei ("p","n",...)
72 virtual void SetCollisionSystem(TString projectile, TString target) { fProjectile = projectile; fTarget = target; }
73 virtual void SetNuclearPDF(Int_t pdf) {fNucPdf = pdf;}
74 virtual void SetUseNuclearPDF(Bool_t val) {fUseNuclearPDF = val;}
75 virtual void SetUseLorentzBoost(Bool_t val) {fUseLorentzBoost = val;}
79 // Energy range for jet trigger
80 virtual void SetJetEtRange(Float_t etmin = 0., Float_t etmax = 1.e4)
81 {fEtMinJet = etmin; fEtMaxJet = etmax;}
82 // Eta range for jet trigger
83 virtual void SetJetEtaRange(Float_t etamin = -20., Float_t etamax = 20.)
84 {fEtaMinJet = etamin; fEtaMaxJet = etamax;}
85 // Phi range for jet trigger
86 virtual void SetJetPhiRange(Float_t phimin = 0., Float_t phimax = 360.)
87 {fPhiMinJet = TMath::Pi()*phimin/180.; fPhiMaxJet = TMath::Pi()*phimax/180.;}
88 // Jet reconstruction mode; default is cone algorithm
89 virtual void SetJetReconstructionMode(Int_t mode = kCell) {fJetReconstruction = mode;}
90 // Eta range for gamma trigger
91 virtual void SetGammaEtaRange(Float_t etamin = -20., Float_t etamax = 20.)
92 {fEtaMinGamma = etamin; fEtaMaxGamma = etamax;}
93 // Phi range for gamma trigger
94 virtual void SetGammaPhiRange(Float_t phimin = 0., Float_t phimax = 360.)
95 {fPhiMinGamma = TMath::Pi()*phimin/180.; fPhiMaxGamma = TMath::Pi()*phimax/180.;}
97 // Select events with fragmentation photon, decay photon, pi0 or eta going to PHOS or EMCAL and central barrel
98 virtual Bool_t TriggerOnSelectedParticles(Int_t np);
100 virtual void SetCheckPHOS (Bool_t b) {fCheckPHOS = b;}
101 virtual void SetCheckEMCAL (Bool_t b) {fCheckEMCAL = b;}
102 virtual void SetCheckBarrel (Bool_t b) {fCheckBarrel = b;}
104 //virtual void SetElectronInEMCAL (Bool_t b) {fEleInEMCAL = b;}
105 //virtual void SetPhotonInPHOS (Bool_t b) {fCheckPHOS = b; fPhotonInCalo = b;} // Not in use
107 virtual void SetFragPhotonInCalo (Bool_t b) { fFragPhotonInCalo = b;}
108 virtual void SetFragPhotonInBarrel(Bool_t b) {fCheckBarrel = b; fFragPhotonInCalo = b;}
109 virtual void SetFragPhotonInEMCAL (Bool_t b) {fCheckEMCAL = b; fFragPhotonInCalo = b;}
110 virtual void SetFragPhotonInPHOS (Bool_t b) {fCheckPHOS = b; fFragPhotonInCalo = b;}
112 virtual void SetHadronInCalo (Bool_t b) { fHadronInCalo = b;}
113 virtual void SetHadronInBarrel (Bool_t b) {fCheckBarrel = b; fHadronInCalo = b;}
114 virtual void SetHadronInEMCAL (Bool_t b) {fCheckEMCAL = b; fHadronInCalo = b;}
115 virtual void SetHadronInPHOS (Bool_t b) {fCheckPHOS = b; fHadronInCalo = b;}
117 virtual void SetElectronInCalo (Bool_t b) { fEleInCalo = b;}
118 virtual void SetElectronInBarrel (Bool_t b) {fCheckBarrel = b; fEleInCalo = b;}
119 virtual void SetElectronInEMCAL (Bool_t b) {fCheckEMCAL = b; fEleInCalo = b;}
120 virtual void SetElectronInPHOS (Bool_t b) {fCheckPHOS = b; fEleInCalo = b;}
122 virtual void SetDecayPhotonInCalo (Bool_t d) {fDecayPhotonInCalo = d;}
123 virtual void SetDecayPhotonInBarrel(Bool_t d) {fDecayPhotonInCalo = d; fCheckBarrel = d;}
124 virtual void SetDecayPhotonInEMCAL(Bool_t d) {fDecayPhotonInCalo = d; fCheckEMCAL = d;}
125 virtual void SetDecayPhotonInPHOS (Bool_t d) {fDecayPhotonInCalo = d; fCheckPHOS = d;}
127 virtual void SetPi0InCalo (Bool_t b, Bool_t f = kFALSE) {fPi0InCalo = b; fForceNeutralMeson2PhotonDecay = f;}
128 virtual void SetPi0InBarrel (Bool_t b, Bool_t f = kFALSE) {fPi0InCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckBarrel= b; }
129 virtual void SetPi0InEMCAL (Bool_t b, Bool_t f = kFALSE) {fPi0InCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckEMCAL = b; }
130 virtual void SetPi0InPHOS (Bool_t b, Bool_t f = kFALSE) {fPi0InCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckPHOS = b; }
132 virtual void SetEtaInCalo (Bool_t b, Bool_t f = kFALSE) {fEtaInCalo = b; fForceNeutralMeson2PhotonDecay = f;}
133 virtual void SetEtaInBarrel (Bool_t b, Bool_t f = kFALSE) {fEtaInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckBarrel= b; }
134 virtual void SetEtaInEMCAL (Bool_t b, Bool_t f = kFALSE) {fEtaInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckEMCAL = b; }
135 virtual void SetEtaInPHOS (Bool_t b, Bool_t f = kFALSE) {fEtaInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckPHOS = b; }
137 virtual void SetPi0PhotonDecayInBarrel(Bool_t b, Bool_t f = kFALSE) {fPi0InCalo = b; fDecayPhotonInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckBarrel = b; }
138 virtual void SetPi0PhotonDecayInEMCAL (Bool_t b, Bool_t f = kFALSE) {fPi0InCalo = b; fDecayPhotonInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckEMCAL = b; }
139 virtual void SetPi0PhotonDecayInPHOS (Bool_t b, Bool_t f = kFALSE) {fPi0InCalo = b; fDecayPhotonInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckPHOS = b; }
141 virtual void SetEtaPhotonDecayInBarrel(Bool_t b, Bool_t f = kFALSE) {fEtaInCalo = b; fDecayPhotonInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckBarrel = b; }
142 virtual void SetEtaPhotonDecayInEMCAL (Bool_t b, Bool_t f = kFALSE) {fEtaInCalo = b; fDecayPhotonInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckEMCAL = b; }
143 virtual void SetEtaPhotonDecayInPHOS (Bool_t b, Bool_t f = kFALSE) {fEtaInCalo = b; fDecayPhotonInCalo = b; fForceNeutralMeson2PhotonDecay = f; fCheckPHOS = b; }
146 // Trigger on a minimum multiplicity
147 virtual void SetTriggerChargedMultiplicity(Int_t multiplicity, Float_t etamax = 0, Float_t ptmin = -1.)
148 {fTriggerMultiplicity = multiplicity; fTriggerMultiplicityEta = etamax;
149 fTriggerMultiplicityPtMin = ptmin;}
151 // Calorimeters acceptance
152 // Set Phi in degrees, and Eta coverage, should not be negative
153 virtual void SetBarrelAcceptance(Float_t deta) {fTriggerEta = deta ;}
154 virtual void SetEMCALAcceptance (Float_t phimin, Float_t phimax, Float_t deta) {fEMCALMinPhi = phimin ; fEMCALMaxPhi = phimax ; fEMCALEta = deta ; }
155 virtual void SetPHOSAcceptance (Float_t phimin, Float_t phimax, Float_t deta) {fPHOSMinPhi = phimin ; fPHOSMaxPhi = phimax ; fPHOSEta = deta ; }
156 virtual void SetRotateParticleInPHOSeta(Bool_t b) {fCheckPHOSeta = b;}
158 virtual void SetTriggerParticleMinPt(Float_t pt) {fTriggerParticleMinPt = pt;}
159 // virtual void SetPhotonMinPt(Float_t pt) {fPhotonMinPt = pt;}
160 // virtual void SetElectronMinPt(Float_t pt) {fElectronMinPt = pt;}
161 // Trigger and rotate event
162 void RotatePhi(Bool_t& okdd);
164 // Trigger on a single particle (not related to calorimeter trigger above)
165 virtual void SetTriggerParticle(Int_t particle = 0, Float_t etamax = 0.9, Float_t ptmin = -1, Float_t ptmax = 1000)
166 {fTriggerParticle = particle; fTriggerEta = etamax; fTriggerMinPt = ptmin; fTriggerMaxPt = ptmax;}
169 // Heavy flavor options
171 // Set option for feed down from higher family
172 virtual void SetFeedDownHigherFamily(Bool_t opt) {
175 // Set option for selecting particles kept in stack according to flavor
176 // or to parent selection
177 virtual void SetStackFillOpt(StackFillOpt_t opt) {
180 // Set fragmentation option
181 virtual void SetFragmentation(Bool_t opt) {
182 fFragmentation = opt;
185 virtual void SetCountMode(CountMode_t mode) {
191 // Set quenching mode 0 = no, 1 = AM, 2 = IL, 3 = NA, 4 = ACS
192 virtual void SetQuench(Int_t flag = 0) {fQuench = flag;}
193 // Set transport coefficient.
194 void SetQhat(Float_t qhat) {fQhat = qhat;}
195 //Set initial medium length.
196 void SetLength(Float_t length) {fLength = length;}
197 //set parameters for pyquen afterburner
198 virtual void SetPyquenPar(Float_t t0=1., Float_t tau0=0.1, Int_t nf=0,Int_t iengl=0, Int_t iangl=3)
199 {fpyquenT = t0; fpyquenTau = tau0; fpyquenNf=nf;fpyquenEloss=iengl;fpyquenAngle=iangl;}
200 virtual void SetHadronisation(Int_t flag = 1) {fHadronisation = flag;}
201 virtual void SetPatchOmegaDalitz(Int_t flag = 1) {fPatchOmegaDalitz = flag;}
202 virtual void SetReadFromFile(const Text_t *filname) {fkFileName = filname; fReadFromFile = 1;}
203 virtual void SetReadLHEF(const Text_t *filename) {fkNameLHEF = filename; fReadLHEF = 1;}
208 // Get interaction rate for pileup studies
209 virtual void SetInteractionRate(Float_t rate,Float_t timewindow = 90.e-6);
210 virtual Float_t GetInteractionRate() const {return fInteractionRate;}
211 // get cross section of process
212 virtual Float_t GetXsection() const {return fXsection;}
213 // get triggered jets
214 void GetJets(Int_t& njets, Int_t& ntrig, Float_t jets[4][10]);
215 void RecJetsUA1(Int_t& njets, Float_t jets[4][50]);
216 void SetPycellParameters(Float_t etamax = 2., Int_t neta = 274, Int_t nphi = 432,
217 Float_t thresh = 0., Float_t etseed = 4.,
218 Float_t minet = 10., Float_t r = 1.);
220 void LoadEvent(AliStack* stack, Int_t flag = 0, Int_t reHadr = 0);
221 void LoadEvent(const TObjArray* stack, Int_t flag = 0, Int_t reHadr = 0);
223 virtual Process_t GetProcess() const {return fProcess;}
224 virtual StrucFunc_t GetStrucFunc() const {return fStrucFunc;}
225 virtual void GetPtHard(Float_t& ptmin, Float_t& ptmax) const
226 {ptmin = fPtHardMin; ptmax = fPtHardMax;}
227 virtual void GetNuclei(Int_t& a1, Int_t& a2) const
228 {a1 = fAProjectile; a2 = fATarget;}
229 virtual void GetJetEtRange(Float_t& etamin, Float_t& etamax) const
230 {etamin = fEtaMinJet; etamax = fEtaMaxJet;}
231 virtual void GetJetPhiRange(Float_t& phimin, Float_t& phimax) const
232 {phimin = fPhiMinJet*180./TMath::Pi(); phimax = fPhiMaxJet*180/TMath::Pi();}
233 virtual void GetGammaEtaRange(Float_t& etamin, Float_t& etamax) const
234 {etamin = fEtaMinGamma; etamax = fEtaMaxGamma;}
235 virtual void GetGammaPhiRange(Float_t& phimin, Float_t& phimax) const
236 {phimin = fPhiMinGamma*180./TMath::Pi(); phimax = fPhiMaxGamma*180./TMath::Pi();}
238 Bool_t CheckDetectorAcceptance(Float_t phi, Float_t eta, Int_t iparticle);
239 Bool_t IsInEMCAL (Float_t phi, Float_t eta) const;
240 Bool_t IsInPHOS (Float_t phi, Float_t eta, Int_t iparticle) ;
241 Bool_t IsInBarrel(Float_t eta) const;
242 Bool_t IsFromHeavyFlavor(Int_t ipart);
244 virtual void FinishRun();
245 Bool_t CheckTrigger(const TParticle* jet1, const TParticle* jet2);
246 //Used in some processes to selected child properties
247 Bool_t CheckKinematicsOnChild();
248 void GetSubEventTime();
250 void SetTuneForDiff(Bool_t a=kTRUE) {fkTuneForDiff=a;}
251 AliDecayer * GetDecayer(){return fDecayer;}
254 // adjust the weight from kinematic cuts
255 void AdjustWeights() const;
258 void GeneratePileup();
259 Process_t fProcess; //Process type
260 Int_t fItune; // Pythia tune > 6.4
261 StrucFunc_t fStrucFunc; //Structure Function
262 Float_t fKineBias; //!Bias from kinematic selection
263 Int_t fTrials; //!Number of trials for current event
264 Int_t fTrialsRun; //!Number of trials for run
266 Float_t fX1; //Mean x1
267 Float_t fX2; //Mean x2
268 Float_t fEventTime; //Time of the subevent
269 Float_t fInteractionRate; //Interaction rate (set by user)
270 Float_t fTimeWindow; //Time window for pileup events (set by user)
271 Int_t fCurSubEvent; //Index of the current sub-event
272 TArrayF *fEventsTime; //Subevents time for pileup
273 Int_t fNev; //Number of events
274 Int_t fFlavorSelect; //Heavy Flavor Selection
275 Float_t fXsection; //Cross-section
276 AliPythia *fPythia; //!Pythia
277 Float_t fPtHardMin; //lower pT-hard cut
278 Float_t fPtHardMax; //higher pT-hard cut
279 Float_t fYHardMin; //lower y-hard cut
280 Float_t fYHardMax; //higher y-hard cut
281 Int_t fGinit; //initial state gluon radiation
282 Int_t fGfinal; //final state gluon radiation
283 Int_t fHadronisation; //hadronisation
284 Bool_t fPatchOmegaDalitz; //flag for omega dalitz decay patch
285 Int_t fNpartons; //Number of partons before hadronisation
286 Int_t fReadFromFile; //read partons from file
287 Int_t fReadLHEF; //read lhef file
288 Int_t fQuench; //Flag for quenching
289 Float_t fQhat; //Transport coefficient (GeV^2/fm)
290 Float_t fLength; //Medium length (fm)
291 Float_t fpyquenT; //Pyquen initial temperature
292 Float_t fpyquenTau; //Pyquen initial proper time
293 Int_t fpyquenNf; //Pyquen number of flavours into the game
294 Int_t fpyquenEloss; //Pyquen type of energy loss
295 Int_t fpyquenAngle; //Pyquen radiation angle for gluons
296 Float_t fImpact; //Impact parameter for quenching simulation (q-pythia)
297 Float_t fPtKick; //Transverse momentum kick
298 Bool_t fFullEvent; //!Write Full event if true
299 AliDecayer *fDecayer; //!Pointer to the decayer instance
300 Int_t fDebugEventFirst; //!First event to debug
301 Int_t fDebugEventLast; //!Last event to debug
302 Float_t fEtMinJet; //Minimum et of triggered Jet
303 Float_t fEtMaxJet; //Maximum et of triggered Jet
304 Float_t fEtaMinJet; //Minimum eta of triggered Jet
305 Float_t fEtaMaxJet; //Maximum eta of triggered Jet
306 Float_t fPhiMinJet; //Minimum phi of triggered Jet
307 Float_t fPhiMaxJet; //Maximum phi of triggered Jet
308 Int_t fJetReconstruction; //Jet Reconstruction mode
309 Float_t fEtaMinGamma; // Minimum eta of triggered gamma
310 Float_t fEtaMaxGamma; // Maximum eta of triggered gamma
311 Float_t fPhiMinGamma; // Minimum phi of triggered gamma
312 Float_t fPhiMaxGamma; // Maximum phi of triggered gamma
313 Float_t fPycellEtaMax; // Max. eta for Pycell
314 Int_t fPycellNEta; // Number of eta bins for Pycell
315 Int_t fPycellNPhi; // Number of phi bins for Pycell
316 Float_t fPycellThreshold; // Pycell threshold
317 Float_t fPycellEtSeed; // Pycell seed
318 Float_t fPycellMinEtJet; // Pycell min. jet et
319 Float_t fPycellMaxRadius; // Pycell cone radius
320 StackFillOpt_t fStackFillOpt; // Stack filling with all particles with
321 // that flavour or only with selected
322 // parents and their decays
323 Bool_t fFeedDownOpt; // Option to set feed down from higher
324 // quark families (e.g. b->c)
325 Bool_t fFragmentation; // Option to activate fragmentation by Pythia
326 Bool_t fSetNuclei; // Flag indicating that SetNuclei has been called
327 Bool_t fUseNuclearPDF; // flag if nuclear pdf should be applied
328 Bool_t fUseLorentzBoost; // flag if lorentz boost should be applied
329 Bool_t fNewMIS; // Flag for the new multipple interactions scenario
330 Bool_t fHFoff; // Flag for switching heafy flavor production off
331 Int_t fNucPdf; // Nuclear pdf 0: EKS98 1: EPS08
332 Int_t fTriggerParticle; // Trigger on this particle ...
333 Float_t fTriggerEta; // .. within |eta| < fTriggerEta
334 Float_t fTriggerMinPt; // .. within pt > fTriggerMinPt
335 Float_t fTriggerMaxPt; // .. within pt < fTriggerMaxPt
336 Int_t fTriggerMultiplicity; // Trigger on events with a minimum charged multiplicity
337 Float_t fTriggerMultiplicityEta; // in a given eta range
338 Float_t fTriggerMultiplicityPtMin; // above this pT
339 CountMode_t fCountMode; // Options for counting when the event will be finished.
340 // fCountMode = kCountAll --> All particles that end up in the
342 // fCountMode = kCountParents --> Only selected parents are counted
343 // fCountMode = kCountTrackabless --> Only particles flagged for tracking
348 AliGenPythiaEventHeader* fHeader; //! Event header
349 AliRunLoader* fRL; //! Run Loader
350 const Text_t* fkFileName; //! Name of file to read from
351 const Text_t* fkNameLHEF; //! Name of lhef file to read from
352 Bool_t fFragPhotonInCalo; // Option to ask for Fragmentation Photon in calorimeters acceptance
353 Bool_t fHadronInCalo; // Option to ask for hadron (not pi0) in calorimeters acceptance
354 Bool_t fPi0InCalo; // Option to ask for Pi0 in calorimeters acceptance
355 Bool_t fEtaInCalo; // Option to ask for Eta in calorimeters acceptance
356 Bool_t fPhotonInCalo; // Option to ask for Photon in calorimeter acceptance (not in use)
357 Bool_t fDecayPhotonInCalo;// Option to ask for Decay Photon in calorimeter acceptance
358 Bool_t fForceNeutralMeson2PhotonDecay; // Option to ask for Pi0/Eta in calorimeters acceptance when decay into 2 photons
359 Bool_t fEleInCalo; // Option to ask for Electron in EMCAL acceptance
360 Bool_t fEleInEMCAL; // Option to ask for Electron in EMCAL acceptance (not in use)
361 Bool_t fCheckBarrel; // Option to ask for FragPhoton or Pi0 or Eta or gamma decays in central barrel acceptance
362 Bool_t fCheckEMCAL; // Option to ask for FragPhoton or Pi0 or Eta or gamma decays in calorimeters EMCAL acceptance
363 Bool_t fCheckPHOS; // Option to ask for FragPhoton or Pi0 or Eta or gamma decays in calorimeters PHOS acceptance
364 Bool_t fCheckPHOSeta; // Option to ask for rotate event particles in phi to have in PHOS acceptance a requested particle that previously had the good eta
365 Int_t fPHOSRotateCandidate; // Internal member to select the particle candidate to trigger the event phi rotation, to put it in PHOS phi acceptance
366 Float_t fTriggerParticleMinPt; // Minimum momentum of Fragmentation Photon or Pi0 or other hadron
367 Float_t fPhotonMinPt; // Minimum momentum of Photon (not in use)
368 Float_t fElectronMinPt; // Minimum momentum of Electron (not in use)
369 //Calorimeters eta-phi acceptance
370 Float_t fPHOSMinPhi; // Minimum phi PHOS, degrees
371 Float_t fPHOSMaxPhi; // Maximum phi PHOS, degrees
372 Float_t fPHOSEta; // Minimum eta PHOS, coverage delta eta
373 Float_t fEMCALMinPhi; // Minimum phi EMCAL, degrees
374 Float_t fEMCALMaxPhi; // Maximum phi EMCAL, degrees
375 Float_t fEMCALEta; // Maximum eta EMCAL, coverage delta eta
377 Bool_t fkTuneForDiff; // Pythia tune
380 AliGenPythia(const AliGenPythia &Pythia);
381 AliGenPythia & operator=(const AliGenPythia & rhs);
384 Bool_t CheckDiffraction();
385 Bool_t GetWeightsDiffraction(Double_t M, Double_t &Mmin, Double_t &Mmax,
386 Double_t &wSD, Double_t &wDD, Double_t &wND);
388 ClassDef(AliGenPythia, 14) // AliGenerator interface to Pythia