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[u/mrichter/AliRoot.git] / TUHKMgen / UHKM / InitialStateHydjet.cxx
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3fa37a65 1//expanding localy equilibated fireball with volume hadron radiation
2//thermal part: Blast wave model, Bjorken-like parametrization
3//hyght-pt: PYTHIA + jet quenching model PYQUEN
4
b1c2e580 5/*
6 HYDJET++
7 version 1.0:
8 InitialStateHydjet is the modified InitialStateBjorken
9 The high-pt part related with PYTHIA-PYQUEN is included
10 InitialStateBjorken (FASTMC) was used.
11
12
13
14 InitialStateBjorken
15 version 2.0:
16 Ludmila Malinina malinina@lav01.sinp.msu.ru, SINP MSU/Moscow and JINR/Dubna
17 Ionut Arsene i.c.arsene@fys.uio.no, Oslo University
18 June 2007
19
20 version 1.0:
21 Nikolai Amelin, Ludmila Malinina, Timur Pocheptsov (C) JINR/Dubna
22 amelin@sunhe.jinr.ru, malinina@sunhe.jinr.ru, pocheptsov@sunhe.jinr.ru
23 November. 2, 2005
24
25
26*/
27
b1c2e580 28#include <TLorentzVector.h>
29#include <TVector3.h>
b1c2e580 30#include <TMath.h>
31
3fa37a65 32#ifndef INITIALSTATEHYDJET_H
b1c2e580 33#include "InitialStateHydjet.h"
34#endif
35#ifndef RANDARRAYFUNCTION_INCLUDED
36#include "RandArrayFunction.h"
37#endif
b1c2e580 38#ifndef GRANDCANONICAL_INCLUDED
39#include "GrandCanonical.h"
40#endif
41#ifndef NAStrangePotential_h
42#include "StrangePotential.h"
43#endif
b1c2e580 44#ifndef PARTICLE_INCLUDED
45#include "Particle.h"
46#endif
47#ifndef PARTICLE_PDG
48#include "ParticlePDG.h"
49#endif
b1c2e580 50#include <iostream>
51#include <fstream>
52#include "HYJET_COMMONS.h"
53extern "C" void hyevnt_();
54extern "C" void myini_();
b1c2e580 55extern HYIPARCommon HYIPAR;
56extern HYFPARCommon HYFPAR;
57extern HYJPARCommon HYJPAR;
58extern HYPARTCommon HYPART;
59extern SERVICECommon SERVICE;
60
61using std::cout;
62using std::endl;
63
3fa37a65 64class ParticleAllocator;
65class TRandom3;
66
67// declaration of the static member fLastIndex
68Int_t Particle::fLastIndex;
69
b1c2e580 70void InitialStateHydjet::Initialize(List_t &source, ParticleAllocator & allocator) {
7b7936e9 71 // Generate initial particles from the soft and hard components
3fa37a65 72
73 // Initialize the static "last index variable"
74 Particle::InitIndexing();
75
b1c2e580 76 //----- high-pt part------------------------------
b1c2e580 77 TLorentzVector partJMom, partJPos, zeroVec;
b1c2e580 78
7b7936e9 79 // run a HYDJET event
80 hyevnt_();
7b7936e9 81
b1c2e580 82 if(fParams.fNhsel != 0) {
3fa37a65 83 //get number of particles in jets
b1c2e580 84 Int_t numbJetPart = HYPART.njp;
3fa37a65 85
86 for(Int_t i = 0; i <numbJetPart; i++) {
87 Int_t pdg = Int_t(HYPART.ppart[i][1]);
b1c2e580 88 Double_t px = HYPART.ppart[i][2];
89 Double_t py = HYPART.ppart[i][3];
90 Double_t pz = HYPART.ppart[i][4];
91 Double_t e = HYPART.ppart[i][5];
92 Double_t vx = HYPART.ppart[i][6];
93 Double_t vy = HYPART.ppart[i][7];
94 Double_t vz = HYPART.ppart[i][8];
95 Double_t vt = HYPART.ppart[i][9];
b1c2e580 96 ParticlePDG *partDef = fDatabase->GetPDGParticle(pdg);
97 Int_t type =1; //from jet
3fa37a65 98 if(partDef) {
99 partJMom.SetXYZT(px, py, pz, e);
100 partJPos.SetXYZT(vx, vy, vz, vt);
101 Particle *particle=new Particle(partDef, partJPos, partJMom, 0, 0, type, -1, zeroVec, zeroVec);
102 particle->SetIndex();
103 allocator.AddParticle(*particle, source);
104 delete particle;
105 }
b1c2e580 106 }
7b7936e9 107 } //nhsel !=0 not only hydro!
b1c2e580 108
b1c2e580 109
110 //----------HYDRO part------------------------------------------------
111 if(fParams.fNhsel < 3) {
112 const Double_t weightMax = 2*TMath::CosH(fParams.fUmax);
113 const Int_t nBins = 100;
114 Double_t probList[nBins];
115 RandArrayFunction arrayFunctDistE(nBins);
116 RandArrayFunction arrayFunctDistR(nBins);
117
118 TLorentzVector partPos, partMom, n1, p0;
119 TVector3 vec3;
b1c2e580 120 //set maximal hadron energy
121 const Double_t eMax = 5.;
122 //-------------------------------------
123 // get impact parameter
b1c2e580 124
125 //effective volume for central
126 double dYl= 2 * fParams.fYlmax; //uniform distr. [-Ylmax; Ylmax]
127 if(fParams.fEtaType >0) dYl = TMath::Sqrt(2 * TMath::Pi()) * fParams.fYlmax ; //Gaussian distr.
3eeebf49 128 Double_t volEffcent = 2 * TMath::Pi() * fParams.fTau * dYl *
129 (fParams.fR * fParams.fR)/TMath::Power((fParams.fUmax),2)*
130 ((fParams.fUmax)*TMath::SinH((fParams.fUmax))-TMath::CosH((fParams.fUmax))+ 1);
b1c2e580 131
132 //effective volume for non-central Simpson2
7b7936e9 133 Double_t volEffnoncent = fParams.fTau * dYl * SimpsonIntegrator2(0., 2.*TMath::Pi());
134 fVolEff = volEffcent * HYFPAR.npart/HYFPAR.npart0;
b1c2e580 135
7b7936e9 136 Double_t coeffRB = TMath::Sqrt(volEffcent * HYFPAR.npart/HYFPAR.npart0/volEffnoncent);
137 Double_t coeffR1 = HYFPAR.npart/HYFPAR.npart0;
138 coeffR1 = TMath::Power(coeffR1, 0.333333);
b1c2e580 139
7b7936e9 140 double veff=fVolEff;
b1c2e580 141
b1c2e580 142 //------------------------------------
143 //cycle on particles types
144 for(Int_t i = 0; i < fParams.fNPartTypes; ++i) {
7b7936e9 145 Double_t mparam = fParams.fPartMult[2 * i] * veff;
146 Int_t multiplicity = gRandom->Poisson(mparam);
b1c2e580 147 const Int_t encoding = fParams.fPartEnc[i];
148
149 if(multiplicity > 0) {
150 ParticlePDG *partDef = fDatabase->GetPDGParticle(encoding);
151 if(!partDef) {
152 Error("InitialStateHydjet::Initialize", "No particle with encoding %d", encoding);
153 continue;
154 }
155 //no charm now !
156 if(partDef->GetCharmQNumber()!=0 || partDef->GetCharmAQNumber()!=0){
b1c2e580 157 continue;
158 }
159
160 //compute chemical potential for single f.o. mu==mu_ch
161 //compute chemical potential for thermal f.o.
162 Double_t mu = fParams.fPartMu[2 * i];
163
164 //choose Bose-Einstein or Fermi-Dirac statistics
165 const Double_t d = !(Int_t(2*partDef->GetSpin()) & 1) ? -1 : 1;
166 const Double_t mass = partDef->GetMass();
167
168 //prepare histogram to sample hadron energy:
169 Double_t h = (eMax - mass) / nBins;
170 Double_t x = mass + 0.5 * h;
7b7936e9 171 Int_t ii;
172 for(ii = 0; ii < nBins; ++ii) {
173 if(x>=mu && fParams.fThFO>0)probList[ii] = x * TMath::Sqrt(x * x - mass * mass) /
b1c2e580 174 (TMath::Exp((x - mu) / (fParams.fThFO)) + d);
7b7936e9 175 if(x>=mu && fParams.fThFO<=0)probList[ii] = x * TMath::Sqrt(x * x - mass * mass) /
b1c2e580 176 (TMath::Exp((x - mu) / (fParams.fT)) + d);
7b7936e9 177 if(x<mu)probList[ii] = 0.;
b1c2e580 178 x += h;
179 }
180 arrayFunctDistE.PrepareTable(probList);
181
182 //prepare histogram to sample hadron transverse radius:
183 h = (fParams.fR) / nBins;
184 x = 0.5 * h;
185 Double_t param = (fParams.fUmax) / (fParams.fR);
7b7936e9 186 for(ii = 0; ii < nBins; ++ii) {
187 probList[ii] = x * TMath::CosH(param*x);
b1c2e580 188 x += h;
189 }
190 arrayFunctDistR.PrepareTable(probList);
191
192 //loop over hadrons, assign hadron coordinates and momenta
193 Double_t weight = 0., yy = 0., px0 = 0., py0 = 0., pz0 = 0.;
194 Double_t e = 0., x0 = 0., y0 = 0., z0 = 0., t0 = 0., etaF = 0.;
7b7936e9 195 Double_t r, rB, phiF;
b1c2e580 196
197 for(Int_t j = 0; j < multiplicity; ++j) {
198 do {
199 fParams.fEtaType <=0 ? etaF = fParams.fYlmax * (2. * gRandom->Rndm() - 1.)
200 : etaF = (fParams.fYlmax) * (gRandom->Gaus());
201 n1.SetXYZT(0.,0.,TMath::SinH(etaF),TMath::CosH(etaF));
202 if(TMath::Abs(etaF)>5.)continue;
203
7b7936e9 204 rB = fParams.fR * coeffRB * coeffR1;
b1c2e580 205
206 Double_t rho = TMath::Sqrt(gRandom->Rndm());
207 Double_t phi = TMath::TwoPi() * gRandom->Rndm();
7b7936e9 208 Double_t rx = TMath::Sqrt(1-fParams.fEpsilon)*rB;
209 Double_t ry = TMath::Sqrt(1+fParams.fEpsilon)*rB;
b1c2e580 210
7b7936e9 211 x0 = rx * rho * TMath::Cos(phi);
212 y0 = ry * rho * TMath::Sin(phi);
b1c2e580 213 r = TMath::Sqrt(x0*x0+y0*y0);
214 phiF = TMath::Abs(TMath::ATan(y0/x0));
215
216 if(x0<0&&y0>0)phiF = TMath::Pi()-phiF;
217 if(x0<0&&y0<0)phiF = TMath::Pi()+phiF;
218 if(x0>0&&y0<0)phiF = 2.*TMath::Pi()-phiF;
219
220 //proper time with emission duration
7b7936e9 221 Double_t tau = coeffR1 * fParams.fTau + sqrt(2.) * fParams.fSigmaTau * coeffR1 * (gRandom->Gaus());
b1c2e580 222 z0 = tau * TMath::SinH(etaF);
223 t0 = tau * TMath::CosH(etaF);
224
7b7936e9 225 Double_t rhou = fParams.fUmax * r / rB;
b1c2e580 226
b1c2e580 227
228 Double_t uxf = TMath::SinH(rhou)*TMath::Sqrt(1+fParams.fDelta)*TMath::Cos(phiF);
229 Double_t uyf = TMath::SinH(rhou)*TMath::Sqrt(1-fParams.fDelta)*TMath::Sin(phiF);
230 Double_t utf = TMath::CosH(etaF) * TMath::CosH(rhou) *
231 TMath::Sqrt(1+fParams.fDelta*TMath::Cos(2*phiF)*TMath::TanH(rhou)*TMath::TanH(rhou));
232 Double_t uzf = TMath::SinH(etaF) * TMath::CosH(rhou) *
233 TMath::Sqrt(1+fParams.fDelta*TMath::Cos(2*phiF)*TMath::TanH(rhou)*TMath::TanH(rhou));
234
235 vec3.SetXYZ(uxf / utf, uyf / utf, uzf / utf);
236 n1.Boost(-vec3);
237
238 yy = weightMax * gRandom->Rndm();
239
240 Double_t php0 = TMath::TwoPi() * gRandom->Rndm();
241 Double_t ctp0 = 2. * gRandom->Rndm() - 1.;
bfd20868 242 Double_t stp0 = TMath::Sqrt((1.-ctp0)*(1.+ctp0));
b1c2e580 243 e = mass + (eMax - mass) * arrayFunctDistE();
bfd20868 244 Double_t pp0 = TMath::Sqrt((e-mass)*(e+mass));
b1c2e580 245 px0 = pp0 * stp0 * TMath::Sin(php0);
246 py0 = pp0 * stp0 * TMath::Cos(php0);
247 pz0 = pp0 * ctp0;
248 p0.SetXYZT(px0, py0, pz0, e);
249
250 //weight for rdr
251 weight = (n1 * p0) /e; // weight for rdr gammar: weight = (n1 * p0) / n1[3] / e;
252 } while(yy >= weight);
253
b1c2e580 254 partMom.SetXYZT(px0, py0, pz0, e);
255 partPos.SetXYZT(x0, y0, z0, t0);
256 partMom.Boost(vec3);
257 Int_t type =0; //hydro
7b7936e9 258
3fa37a65 259 Particle *particle=new Particle(partDef, partPos, partMom, 0., 0, type, -1, zeroVec, zeroVec);
260 particle->SetIndex();
261 allocator.AddParticle(*particle, source);
262 delete particle;
b1c2e580 263 } //nhsel==4 , no hydro part
264 }
265 }
266 }
267
b1c2e580 268}
269
270Bool_t InitialStateHydjet::ReadParams() {
7b7936e9 271 // Read parameters from an input file in ascii
272
b1c2e580 273 Float_t par[200] = {0.};
274 Int_t i = 0;
275 std::string s(40,' ');
276 std::ifstream input("RunInputHydjet");
277 if (!input) {
278 Error("Ukm::ReadParams", "Cannot open RunInputHydjet");
279 return kFALSE;
280 }
281
282 while (std::getline(input, s)) {
283 input>>par[i];
284 if (i < 140)
285 std::cout<<s<<" = "<<par[i]<<std::endl;
286 ++i;
287 std::getline(input,s);
288 }
289
290 std::cout<<"\nFor output use the files RunOutput.root \n\n"<< std::endl;
291
292 fParams.fNevnt = Int_t(par[0]); //number of events
293 fParams.fSqrtS = par[1]; //cms energy per nucleon
294 fParams.fAw = par[2]; // atomic number of colliding nuclei
295 fParams.fIfb = Int_t(par[3]); // flag of type of centrality generation (=0 is fixed by fBfix, not 0
296 //impact parameter is generated in each event between fBfmin
297 //and fBmax according with Glauber model (f-la 30)
298 fParams.fBmin = par[4]; //minimum impact parameter in units of nuclear radius RA
299 fParams.fBmax = par[5]; //maximum impact parameter in units of nuclear radius RA
300 fParams.fBfix = par[6]; //fix impact parameter in units of nuclear radius RA
301
302 fParams.fSeed = Int_t(par[7]); //parameter to set the random nuber seed (=0 the current time is used
303 //to set the random generator seed, !=0 the value fSeed is
304 //used to set the random generator seed and then the state of random
305 //number generator in PYTHIA MRPY(1)=fSeed
306
307 fParams.fT = par[8]; //chemical freeze-out temperature in GeV
308 fParams.fMuB = par[9]; //baryon potential
309 fParams.fMuS = par[10]; //strangeness potential
310 fParams.fMuI3 = par[11]; //isospin potential
311 fParams.fThFO = par[12]; //thermal freeze-out temperature T^th in GeV
312 fParams.fMu_th_pip = par[13]; // effective chemical potential of positivly charged pions at thermal in GeV
313
314
315 fParams.fTau = par[14]; //proper time value
316 fParams.fSigmaTau = par[15]; //its standart deviation (emission duration)
317 fParams.fR = par[16]; //maximal transverse radius
318 fParams.fYlmax = par[17]; //maximal longitudinal rapidity
319 fParams.fUmax = par[18]; //maximal transverse velocity multiplaed on \gamma_r
320 fParams.fDelta = par[19]; //momentum asymmetry parameter
321 fParams.fEpsilon = par[20]; //coordinate asymmetry parameter
322
323 fParams.fDecay = Int_t(par[21]); // flag to switch on/off hadron decays<0: decays off,>=0: decays on, (default: 0)
324 fParams.fWeakDecay = Int_t(par[22]); //flag to switch on/off weak hadron decays <0: decays off, >0: decays on, (default: 0)
325
326 fParams.fEtaType = Int_t(par[23]); // flag to choose rapidity distribution, if fEtaType<=0,
327 //then uniform rapidity distribution in [-fYlmax,fYlmax] if fEtaType>0,
328 //then Gaussian with dispertion = fYlmax
329
330 fParams.fTMuType = Int_t(par[24]); // flag to use calculated chemical freeze-out temperature,
331 //baryon potential and strangeness potential as a function of fSqrtS
332
333 fParams.fCorrS = par[25]; // flag and value to include strangeness supression factor
334 fParams.fNhsel = Int_t(par[26]); //flag to switch on/off jet and hydro-state production (0: jet
335 // production off and hydro on, 1: jet production on and jet quenching
336 // off and hydro on, 2: jet production on and jet quenching on and
337 // hydro on, 3: jet production on and jet quenching off and hydro
338 // off, 4: jet production on and jet quenching on and hydro off
339
340 fParams.fIshad= Int_t(par[27]); //flag to switch on/off impact parameter dependent nuclear
341 // shadowing for gluons and light sea quarks (u,d,s) (0: shadowing off,
342 // 1: shadowing on for fAw=207, 197, 110, 40, default: 1
343
344 fParams.fPtmin = par[28]; //minimal transverse momentum transfer p_T of hard
345 // parton-parton scatterings in GeV (the PYTHIA parameter ckin(3)=fPtmin)
346
347 // PYQUEN energy loss model parameters:
348
349 fParams.fT0 = par[29]; // initial temperature (in GeV) of QGP for
350 //central Pb+Pb collisions at mid-rapidity (initial temperature for other
351 //centralities and atomic numbers will be calculated automatically) (allowed range is 0.2<fT0<2)
352
353 fParams.fTau0= par[30]; //proper QGP formation time in fm/c (0.01<fTau0<10)
354 fParams.fNf= Int_t(par[31]); //number of active quark flavours N_f in QGP fNf=0, 1,2 or 3
355 fParams.fIenglu= Int_t(par[32]); // flag to fix type of in-medium partonic energy loss
356 //(0: radiative and collisional loss, 1: radiative loss only, 2:
357 //collisional loss only) (default: 0);
358 fParams.fIanglu= Int_t(par[33]); //flag to fix type of angular distribution of in-medium emitted
359 // gluons (0: small-angular, 1: wide-angular, 2:collinear) (default: 0).
360
361
362 //PYTHIA parameters:
363 Int_t jj;
364 for (Int_t j = 0; j <25; ++j) {
365 jj= 35+j;
366 SERVICE.parPYTH[j]=par[jj];
367 }
368
369 // Set Random Number seed
370
371 gRandom->SetSeed(fParams.fSeed); //Set 0 to use the current time
372 //to send seed in PYTHIA
373 SERVICE.iseed_fromC=gRandom->GetSeed();
374 std::cout<<"Seed for random number generation= "<<gRandom->GetSeed()<<std::endl;
375
376 fParams.fNPartTypes = 0; //counter of hadron species
377 return kTRUE;
378}
379
380Bool_t InitialStateHydjet::MultIni() {
7b7936e9 381 // Calculate average multiplicities, chemical potentials (if necessary),
382 // initialize pyquen
383
b1c2e580 384 //check and redefine input parameters
385 if(fParams.fTMuType>0 && fParams.fSqrtS > 2.24) {
386 if(fParams.fSqrtS < 2.24){
387 Error("InitialStateHydjet::MultIni", "SqrtS<2.24 not allowed with fParams.fTMuType>0");
388 return 0;
389 }
390
391 //sqrt(s) = 2.24 ==> T_kin = 0.8 GeV
392 //see J. Cleymans, H. Oeschler, K. Redlich,S. Wheaton, Phys Rev. C73 034905 (2006)
393 fParams.fMuB = 1.308/(1. + fParams.fSqrtS*0.273);
394 fParams.fT = 0.166 - 0.139*fParams.fMuB*fParams.fMuB - 0.053*fParams.fMuB*fParams.fMuB*
395 fParams.fMuB*fParams.fMuB;
396 fParams.fMuI3 = 0.;
397 fParams.fMuS = 0.;
398 //create strange potential object and set strangeness density 0
399 NAStrangePotential* psp = new NAStrangePotential(0., fDatabase);
400 psp->SetBaryonPotential(fParams.fMuB);
401 psp->SetTemperature(fParams.fT);
402 //compute strangeness potential
403 if(fParams.fMuB > 0.01)
404 fParams.fMuS = psp->CalculateStrangePotential();
b1c2e580 405
406 //if user choose fYlmax larger then allowed by kinematics at the specified beam energy sqrt(s)
407 if(fParams.fYlmax > TMath::Log(fParams.fSqrtS/0.94)){
408 Error("InitialStateHydjet::MultIni", "fParams.fYlmax > TMath::Log(fParams.fSqrtS/0.94)!!! ");
409 return 0;
410 }
411
412
413 if(fParams.fCorrS <= 0.) {
414 //see F. Becattini, J. Mannien, M. Gazdzicki, Phys Rev. C73 044905 (2006)
415 fParams.fCorrS = 1. - 0.386* TMath::Exp(-1.23*fParams.fT/fParams.fMuB);
b1c2e580 416
417 }
418 std::cout<<"The phenomenological f-la J. Cleymans et al. PRC73 034905 (2006) for Tch mu_B was used." << std::endl;
419 std::cout<<"The simulation will be done with the calculated parameters:" << std::endl;
420 std::cout<<"Baryon chemical potential = "<<fParams.fMuB<< " [GeV]" << std::endl;
421 std::cout<<"Strangeness chemical potential = "<<fParams.fMuS<< " [GeV]" << std::endl;
422 std::cout<<"Isospin chemical potential = "<<fParams.fMuI3<< " [GeV]" << std::endl;
423 std::cout<<"Strangeness suppression parameter = "<<fParams.fCorrS << std::endl;
424 std::cout<<"Eta_max = "<<fParams.fYlmax<< std::endl;
425 std::cout << std::endl;
426
427 }
428
429
b1c2e580 430 //initialisation of high-pt part
431
432 HYJPAR.nhsel = fParams.fNhsel;
433 HYJPAR.ptmin = fParams.fPtmin;
434 HYJPAR.ishad = fParams.fIshad;
435 HYIPAR.bminh = fParams.fBmin;
436 HYIPAR.bmaxh = fParams.fBmax;
437 HYIPAR.AW = fParams.fAw;
438
439 HYPYIN.ifb = fParams.fIfb;
440 HYPYIN.bfix = fParams.fBfix;
441 HYPYIN.ene = fParams.fSqrtS;
442
443 PYQPAR.T0 = fParams.fT0;
444 PYQPAR.tau0 = fParams.fTau0;
445 PYQPAR.nf = fParams.fNf;
446 PYQPAR.ienglu = fParams.fIenglu;
447 PYQPAR.ianglu = fParams.fIanglu;
448
449
7b7936e9 450 myini_(); //
b1c2e580 451
452
453 // calculation of multiplicities of different particle species
454 // according to the grand canonical approach
455 GrandCanonical gc(15, fParams.fT, fParams.fMuB, fParams.fMuS, fParams.fMuI3);
3fa37a65 456 GrandCanonical gcCh(15, fParams.fT, fParams.fMuB, fParams.fMuS, fParams.fMuI3);
457 GrandCanonical gcPiTh(15, fParams.fThFO, 0., 0., fParams.fMu_th_pip);
458 GrandCanonical gcTh0(15, fParams.fThFO, 0., 0., 0.);
b1c2e580 459
460 //effective volume for central
461 double dYl= 2 * fParams.fYlmax; //uniform distr. [-Ylmax; Ylmax]
462 if (fParams.fEtaType >0) dYl = TMath::Sqrt(2 * TMath::Pi()) * fParams.fYlmax ; //Gaussian distr.
463 fVolEff = 2 * TMath::Pi() * fParams.fTau * dYl * (fParams.fR * fParams.fR)/TMath::Power((fParams.fUmax),2) *
464 ((fParams.fUmax)*TMath::SinH((fParams.fUmax))-TMath::CosH((fParams.fUmax))+ 1);
b1c2e580 465
3fa37a65 466 Double_t particleDensityPiCh=0;
467 Double_t particleDensityPiTh=0;
b1c2e580 468
469 if(fParams.fThFO != fParams.fT && fParams.fThFO > 0){
3fa37a65 470 particleDensityPiCh = gcCh.ParticleNumberDensity(fDatabase->GetPDGParticle(211));
471 particleDensityPiTh = gcPiTh.ParticleNumberDensity(fDatabase->GetPDGParticle(211));
b1c2e580 472 }
473
474 for(Int_t particleIndex = 0; particleIndex < fDatabase->GetNParticles(); particleIndex++) {
475 ParticlePDG *currParticle = fDatabase->GetPDGParticleByIndex(particleIndex);
476 Int_t encoding = currParticle->GetPDG();
477 //strangeness supression
478 Double_t gammaS = 1;
7b7936e9 479 Int_t s = Int_t(currParticle->GetStrangeness());
480 if(encoding == 333)
481 s = 2;
482 if(fParams.fCorrS < 1. && s != 0)
483 gammaS = TMath::Power(fParams.fCorrS,-TMath::Abs(s));
b1c2e580 484 //average densities
7b7936e9 485 Double_t particleDensity = gc.ParticleNumberDensity(currParticle)/gammaS;
b1c2e580 486
487 //compute chemical potential for single f.o. mu==mu_ch
488 Double_t mu = fParams.fMuB * Int_t(currParticle->GetBaryonNumber()) +
489 fParams.fMuS * Int_t(currParticle->GetStrangeness()) +
490 fParams.fMuI3 * Int_t(currParticle->GetElectricCharge());
491
492 //thermal f.o.
493 if(fParams.fThFO != fParams.fT && fParams.fThFO > 0){
3fa37a65 494 Double_t particleDensityCh = gcCh.ParticleNumberDensity(currParticle);
495 Double_t particleDensityTh0 = gcTh0.ParticleNumberDensity(currParticle);
496 Double_t numbDensBolt = particleDensityPiTh*particleDensityCh/particleDensityPiCh;
497 mu = fParams.fThFO*TMath::Log(numbDensBolt/particleDensityTh0);
b1c2e580 498 if(abs(encoding)==211 || encoding==111)mu= fParams.fMu_th_pip;
3fa37a65 499 particleDensity = numbDensBolt;
b1c2e580 500 }
501
7b7936e9 502 // set particle number density to zero for some species
503 // photons
504 if(abs(encoding)==22)
505 particleDensity=0;
506 // K0L and K0S
507 if(abs(encoding)==130 || abs(encoding)==310) {
508 particleDensity=0;
509 }
b1c2e580 510
511 if(particleDensity > 0.) {
512 // outMult<<encoding<< " " <<particleDensity<< " "<<mu<<std::endl;
513 fParams.fPartEnc[fParams.fNPartTypes] = encoding;
514 fParams.fPartMult[2 * fParams.fNPartTypes] = particleDensity;
515 fParams.fPartMu[2 * fParams.fNPartTypes] = mu;
516 ++fParams.fNPartTypes;
517 if(fParams.fNPartTypes > 1000)
518 Error("in Bool_t MultIni:", "fNPartTypes is too large %d", fParams.fNPartTypes);
519 }
520 }
521 return kTRUE;
522}
523
524Double_t InitialStateHydjet::SimpsonIntegrator2(Double_t a, Double_t b) {
7b7936e9 525 // Simpson integration
b1c2e580 526 Int_t nsubIntervals=10000;
527 Double_t h = (b - a)/nsubIntervals; //0-pi, phi
528 Double_t s=0;
b1c2e580 529 Double_t x = 0; //phi
530 for(Int_t j = 1; j < nsubIntervals; j++) {
531 x += h; // phi
532 Double_t e = fParams.fEpsilon;
3fa37a65 533 Double_t rSB = fParams.fR; //test: podstavit' *coefff_RB
534 Double_t rB = rSB *(TMath::Sqrt(1-e*e)/TMath::Sqrt(1+e*TMath::Cos(2*x))); //f-la7 rB
7b7936e9 535 Double_t sr = SimpsonIntegrator(0,rB,x);
b1c2e580 536 s += sr;
537 }
538 return s*h;
539
540}
541
542Double_t InitialStateHydjet::SimpsonIntegrator(Double_t a, Double_t b, Double_t phi) {
7b7936e9 543 // Simpson integration
b1c2e580 544 Int_t nsubIntervals=100;
545 Double_t h = (b - a)/nsubIntervals;
546 Double_t s = f2(phi,a + 0.5*h);
547 Double_t t = 0.5*(f2(phi,a) + f2(phi,b));
548 Double_t x = a;
549 Double_t y = a + 0.5*h;
550 for(Int_t i = 1; i < nsubIntervals; i++) {
551 x += h;
552 y += h;
553 s += f2(phi,y);
554 t += f2(phi,x);
555 }
556 t += 2.0*s;
557 return t*h/3.0;
558}
559
560
561//f2=f(phi,r)
562Double_t InitialStateHydjet::f2(Double_t x, Double_t y) {
7b7936e9 563 // formula
3fa37a65 564 Double_t rSB = fParams.fR; //test: podstavit' *coefff_RB
565 Double_t rhou = fParams.fUmax * y / rSB;
b1c2e580 566 Double_t ff = y*TMath::CosH(rhou)*
567 TMath::Sqrt(1+fParams.fDelta*TMath::Cos(2*x)*TMath::TanH(rhou)*TMath::TanH(rhou));
568//n_mu u^mu f-la 20
569 return ff;
570}
571
572
573Double_t InitialStateHydjet::MidpointIntegrator2(Double_t a, Double_t b) {
7b7936e9 574 // Perform integration through the mid-point method
b1c2e580 575 Int_t nsubIntervals=2000;
576 Int_t nsubIntervals2=1;
577 Double_t h = (b - a)/nsubIntervals; //0-pi , phi
7b7936e9 578 Double_t h2 = (fParams.fR)/nsubIntervals; //0-R maximal rB ?
b1c2e580 579 Double_t x = a + 0.5*h;
580 Double_t y = 0;
b1c2e580 581 Double_t t = f2(x,y);
b1c2e580 582 Double_t e = fParams.fEpsilon;
b1c2e580 583 for(Int_t j = 1; j < nsubIntervals; j++) {
584 x += h; // integr phi
3fa37a65 585 Double_t rSB = fParams.fR; //test: podstavit' *coefff_RB
586 Double_t rB = rSB *(TMath::Sqrt(1-e*e)/TMath::Sqrt(1+e*TMath::Cos(2*x))); //f-la7 rB
7b7936e9 587 nsubIntervals2 = Int_t(rB / h2)+1;
b1c2e580 588 // integr R
589 y=0;
590 for(Int_t i = 1; i < nsubIntervals2; i++)
591 t += f2(x,(y += h2));
592 }
593 return t*h*h2;
594}
595