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4fdf4eb3 1#include "AliHBTLLWeights.h"
88cb7938 2/**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
7 * *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
16
17//_________________________________________________________________________
18///////////////////////////////////////////////////////////////////////////
19//
20// class AliHBTLLWeights
21//
22// This class introduces the weight's calculation
23// according to the Lednicky's algorithm.
24//
25//
26// fsiw.f, fsiini.f
27//
28// Description from fortran code by author R. Lednicky
29//
30// Calculates final state interaction (FSI) weights
31// WEIF = weight due to particle - (effective) nucleus FSI (p-N)
32// WEI = weight due to p-p-N FSI
33// WEIN = weight due to p-p FSI; note that WEIN=WEI if I3C=0;
34// note that if I3C=1 the calculation of
35// WEIN can be skipped by putting J=0
36//.......................................................................
37// Correlation Functions:
38// CF(p-p-N) = sum(WEI)/sum(WEIF)
39// CF(p-p) = sum(WEIN)/sum(1); here the nucleus is completely
40// inactive
41// CF(p-p-"N") = sum(WEIN*WEIF')/sum(WEIF'), where WEIN and WEIF'
42// are not correlated (calculated at different emission
43// points, e.g., for different events);
44// thus here the nucleus affects one-particle
45// spectra but not the correlation
46//.......................................................................
47// User must supply data file <fn> on unit NUNIT (e.g. =11) specifying
48// LL : particle pair
49// NS : approximation used to calculate Bethe-Salpeter amplitude
50// ITEST: test switch
51// If ITEST=1 then also following parameters are required
52// ICH : 1(0) Coulomb interaction between the two particles ON (OFF)
53// IQS : 1(0) quantum statistics for the two particles ON (OFF)
54// ISI : 1(0) strong interaction between the two particles ON (OFF)
55// I3C : 1(0) Coulomb interaction with residual nucleus ON (OFF)
56// This data file can contain other information useful for the user.
57// It is read by subroutines READINT4 and READREA8(4) (or READ_FILE).
58// -------------------------------------------------------------------
59//- LL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17
60//- part. 1: n p n alfa pi+ pi0 pi+ n p pi+ pi+ pi+ pi- K+ K+ K+ K-
61//- part. 2: n p p alfa pi- pi0 pi+ d d K- K+ p p K- K+ p p
62// NS=1 y/n: + + + + + - - - - - - - - - - - -
63// -------------------------------------------------------------------
64//- LL 18 19 20 21 22 23 24 25 26 27 28
65//- part. 1: d d t t K0 K0 d p p p n
66//- part. 2: d alfa t alfa K0 K0b t t alfa lambda lambda
67// NS=1 y/n: - - - - - - - - - + +
68// -------------------------------------------------------------------
69// NS=1 Square well potential,
70// NS=3 not used
71// NS=4 scattered wave approximated by the spherical wave,
72// NS=2 same as NS=4 but the approx. of equal emission times in PRF
73// not required (t=0 approx. used in all other cases).
74// Note: if NS=2,4, the B-S amplitude diverges at zero distance r* in
75// the two-particle c.m.s.; user can specify a cutoff AA in
76// SUBROUTINE FSIINI, for example:
77// IF(NS.EQ.2.OR.NS.EQ.4)AA=5.D0 !! in 1/GeV --> AA=1. fm
78// ------------------------------------------------------------------
79// ITEST=1 any values of parameters ICH, IQS, ISI, I3C are allowed
80// and should be given in data file <fn>
81// ITEST=0 physical values of these parameters are put automatically
82// in FSIINI (their values are not required in data file)
83//=====================================================================
84// At the beginning of calculation user should call FSIINI,
85// which reads LL, NS, ITEST (and eventually ICH, IQS, ISI, I3C)
86// and initializes various parameters.
87// In particular the constants in
88// COMMON/FSI_CONS/PI,PI2,SPI,DR,W
89// may be useful for the user:
90// W=1/.1973D0 ! from fm to 1/GeV
91// PI=4*DATAN(1.D0)
92// PI2=2*PI
93// SPI=DSQRT(PI)
94// DR=180.D0/PI ! from radian to degree
95// _______________________________________________________
96// !! |Important note: all real quantities are assumed REAL*8 | !!
97// -------------------------------------------------------
98// For each event user should fill in the following information
99// in COMMONs (all COMMONs in FSI calculation start with FSI_):
100// ...................................................................
101// COMMON/FSI_POC/AMN,AM1,AM2,CN,C1,C2,AC1,AC2
102// Only
103// AMN = mass of the effective nucleus [GeV/c**2]
104// CN = charge of the effective nucleus [elem. charge units]
105// are required
106// ...................................................................
107// COMMON/FSI_MOM/P1X,P1Y,P1Z,E1,P1, !part. momenta in the rest frame
108// 1 P2X,P2Y,P2Z,E2,P2 !of effective nucleus (NRF)
109// Only the components
110// PiX,PiY,PiZ [GeV/c]
111// in NRF are required.
112// To make the corresponding Lorentz transformation user can use the
113// subroutines LTRAN and LTRANB
114// ...................................................................
115// COMMON/FSI_COOR/X1,Y1,Z1,T1,R1, ! 4-coord. of emission
116// 1 X2,Y2,Z2,T2,R2 ! points in NRF
117// The componets
118// Xi,Yi,Zi [fm]
119// and emission times
120// Ti [fm/c]
121// should be given in NRF with the origin assumed at the center
122// of the effective nucleus. If the effect of residual nucleus is
123// not calculated within FSIW, the NRF can be any fixed frame.
124// --------------------------------------------------------------------
125// Before calling FSIW the user must call
126// CALL LTRAN12
127// Besides Lorentz transformation to pair rest frame:
128// (p1-p2)/2 --> k* it also transforms 4-coordinates of
129// emission points from fm to 1/GeV and calculates Ei,Pi and Ri.
130// Note that |k*|=AK in COMMON/FSI_PRF/
131// --------------------------------------------------------------------
132// After making some additional filtering using k* (say k* < k*max)
133// or direction of vector k*,
134// user can finally call FSIW to calculate the FSI weights
135// to be used to construct the correlation function
136//======================================================================
137
4fdf4eb3 138
7f92929e 139/*******************************************************************/
140/****** ROUTINES USED FOR COMMUNUCATION ********/
141/******************** WITH FORTRAN ********************/
142/*******************************************************************/
143#ifndef WIN32
144# define led_bldata led_bldata_
145# define fsiini fsiini_
146# define ltran12 ltran12_
147# define fsiw fsiw_
88cb7938 148# define setpdist setpdist_
7f92929e 149# define type_of_call
150#else
151# define led_bldata LED_BLDATA
152# define fsiini FSIINI
153# define ltran12 LTRAN12
154# define fsiw FSIW
88cb7938 155# define setpdist SETPDIST
7f92929e 156# define type_of_call _stdcall
157#endif
158/****************************************************************/
159extern "C" void type_of_call led_bldata();
160extern "C" void type_of_call fsiini();
161extern "C" void type_of_call ltran12();
162extern "C" void type_of_call fsiw();
88cb7938 163extern "C" void type_of_call setpdist(Double_t& r);
7f92929e 164/**************************************************************/
165
88cb7938 166#include "AliHBTPair.h"
167#include "AliHBTParticle.h"
168#include "WLedCOMMONS.h"
169#include <TList.h>
170#include <TRandom.h>
171#include <TMath.h>
172#include <TPDGCode.h>
173
174
7f92929e 175ClassImp(AliHBTLLWeights)
7f92929e 176
88cb7938 177AliHBTLLWeights* AliHBTLLWeights::fgLLWeights = 0x0;
178const Double_t AliHBTLLWeights::fgkWcons = 1./0.1973;
7f92929e 179
88cb7938 180AliHBTLLWeights::AliHBTLLWeights():
181 fTest(kTRUE),
182 fColoumbSwitch(kTRUE),
183 fQuantStatSwitch(kTRUE),
184 fStrongInterSwitch(kTRUE),
185 fColWithResidNuclSwitch(kTRUE),
186 fNuclMass(0.0),
187 fNuclCharge(0.0),
188 fRandomPosition(kFALSE),
189 fRadius(0.0),
190 fPID1(0),
191 fPID2(0),
192 fSigma(0.0)
7f92929e 193{
88cb7938 194// Default Constructor
7f92929e 195}
88cb7938 196/**************************************************************/
7f92929e 197
4fdf4eb3 198AliHBTLLWeights* AliHBTLLWeights::Instance()
88cb7938 199{
200// returns instance of class
201 if (fgLLWeights)
202 {
4fdf4eb3 203 return fgLLWeights;
88cb7938 204 }
205 else
206 {
207 fgLLWeights = new AliHBTLLWeights();
208 return fgLLWeights;
209 }
210}
211
7f92929e 212
213Double_t AliHBTLLWeights::GetWeight(const AliHBTPair* partpair)
214{
88cb7938 215// calculates weight for a pair
216 static const Double_t cmtofm = 1.e13;
217
4fdf4eb3 218 AliHBTParticle *part1 = partpair->Particle1();
219 AliHBTParticle *part2 = partpair->Particle2();
2f8eea63 220
4fdf4eb3 221 if ( (part1 == 0x0) || (part2 == 0x0))
88cb7938 222 {
223 Error("GetWeight","Null particle pointer");
224 return 0.0;
225 }
226
227
228//eats a lot of time
4fdf4eb3 229 if ( (part1->Px() == part2->Px()) &&
230 (part1->Py() == part2->Py()) &&
231 (part1->Pz() == part2->Pz()) )
88cb7938 232 {
233 return 0.0;
234 }
235
4fdf4eb3 236 if ((!fRandomPosition) &&
88cb7938 237 (part1->Vx() == part2->Vx()) &&
238 (part1->Vy() == part2->Vy()) &&
239 (part1->Vz() == part2->Vz()) )
2f8eea63 240 {
4fdf4eb3 241 return 0.0;
2f8eea63 242 }
88cb7938 243
244 FSI_MOM.P1X = part1->Px();
245 FSI_MOM.P1Y = part1->Py();
246 FSI_MOM.P1Z = part1->Pz();
247
248 FSI_MOM.P2X = part2->Px();
249 FSI_MOM.P2Y = part2->Py();
250 FSI_MOM.P2Z = part2->Pz();
251
252 FSI_COOR.X1 = part1->Vx()*cmtofm;
253 FSI_COOR.Y1 = part1->Vy()*cmtofm;
254 FSI_COOR.Z1 = part1->Vz()*cmtofm;
255 FSI_COOR.T1 = part1->T();
256
257 FSI_COOR.X2 = part2->Vx()*cmtofm;
258 FSI_COOR.Y2 = part2->Vy()*cmtofm;
259 FSI_COOR.Z2 = part2->Vz()*cmtofm;
260 FSI_COOR.T2 = part2->T();
4fdf4eb3 261
262 ltran12();
7f92929e 263
88cb7938 264 //this must be after ltran12 because it would overwrite what we set below
265 if (fRandomPosition)
266 {
267 Double_t rxcm = fSigma*gRandom->Gaus();
268 Double_t rycm = fSigma*gRandom->Gaus();
269 Double_t rzcm = fSigma*gRandom->Gaus();
270
271 FSI_PRF.X=rxcm*fgkWcons;
272 FSI_PRF.Y=rycm*fgkWcons;
273 FSI_PRF.Z=rzcm*fgkWcons;
274 FSI_PRF.T=0.;
275
276 Double_t rps=rxcm*rxcm+rycm*rycm+rzcm*rzcm;
277 Double_t rp=TMath::Sqrt(rps);
278 setpdist(rp);
279 }
280
281 fsiw();
4fdf4eb3 282 return LEDWEIGHT.WEIN;
283}
7f92929e 284/************************************************************/
88cb7938 285
7f92929e 286void AliHBTLLWeights::Init()
4fdf4eb3 287{
88cb7938 288//initial parameters of model
289
4fdf4eb3 290 FSI_NS.NS = fApproximationModel;
291
88cb7938 292 LEDWEIGHT.ITEST = fTest;
293 if(fTest)
294 {
295 FSI_NS.ICH = fColoumbSwitch;
296 FSI_NS.ISI = fStrongInterSwitch;
297 FSI_NS.IQS = fQuantStatSwitch;
298 FSI_NS.I3C = fColWithResidNuclSwitch;
299 LEDWEIGHT.IRANPOS = fRandomPosition;
300 }
301
4fdf4eb3 302 if ( (fPID1 == 0) || (fPID2 == 0) )
88cb7938 303 {
304 Fatal("Init","Particles types are not set");
305 return;//pro forma
306 }
4fdf4eb3 307 FSI_NS.LL = GetPairCode(fPID1,fPID2);
88cb7938 308
4fdf4eb3 309 if (FSI_NS.LL == 0)
88cb7938 310 {
311 Fatal("Init","Particles types are not supported");
312 return;//pro forma
313 }
314
315
4fdf4eb3 316 TParticlePDG* tpart1 = TDatabasePDG::Instance()->GetParticle(fPID1);
317 if (tpart1 == 0x0)
88cb7938 318 {
319 Fatal("init","We can not find particle with ID=%d in PDG DataBase",fPID1);
320 return;
321 }
322
4fdf4eb3 323 FSI_POC.AM1=tpart1->Mass();
324 FSI_POC.C1=tpart1->Charge();
88cb7938 325
4fdf4eb3 326 TParticlePDG* tpart2 = TDatabasePDG::Instance()->GetParticle(fPID2);
88cb7938 327//lv
4fdf4eb3 328 if (tpart2 == 0x0)
88cb7938 329 {
330 Fatal("init","We can not find particle with ID=%d in our DataBase",fPID2);
331 return;
332 }
333
4fdf4eb3 334 FSI_POC.AM2=tpart2->Mass();
335 FSI_POC.C1=tpart2->Charge();
88cb7938 336
4fdf4eb3 337 led_bldata();
338 fsiini();
88cb7938 339
340
341//constants for radii simulation
342
343 if(fRandomPosition)
344 {
345 fSigma =TMath::Sqrt(2.)*fRadius;
346 }
7f92929e 347}
88cb7938 348/************************************************************/
7f92929e 349
350Int_t AliHBTLLWeights::GetPairCode(const AliHBTPair* partpair)
351{
88cb7938 352//returns Code corresponding to that pair
353 return GetPairCode(partpair->Particle1()->GetPdgCode(),partpair->Particle2()->GetPdgCode());
7f92929e 354}
88cb7938 355/************************************************************/
7f92929e 356
357Int_t AliHBTLLWeights::GetPairCode(Int_t pid1,Int_t pid2)
358{
88cb7938 359// returns code corresponding to the pair of PIDs
360// pairCode 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
361// hpid: n p n alfa pi+ pi0 pi+ n p pi+ pi+ pi+ pi- K+ K+ K+ K- d d t t K0 K0 d p p p n
362// lpid: n p p alfa pi- pi0 pi+ d d K- K+ p p K- K+ p p d alfa t alfa K0 K0b t t alfa lambda lambda
363// NS=1 y/n: + + + + + - - - - - - - - - - - - - - - - - - - - - - -
364
365//alphas, deuterons and tyts are NOT supported here
366
7f92929e 367 Int_t chargefactor = 1;
368 Int_t hpid; //pid in higher row
369 Int_t lpid; //pid in lower row
370 Int_t code; //pairCode
371
372 Bool_t swap;
373
88cb7938 374//determine the order of selcetion in switch
7f92929e 375 if (TMath::Abs(pid1) < TMath::Abs(pid2) )
88cb7938 376 {
377 if (pid1<0) chargefactor=-1;
378 hpid=pid2*chargefactor;
379 lpid=pid1*chargefactor;
380 swap = kFALSE;
381 }
7f92929e 382 else
88cb7938 383 {
384 if (pid2<0) chargefactor=-1;
385 hpid=pid1*chargefactor;
386 lpid=pid2*chargefactor;
387 swap = kTRUE;
388 }
389
390//mlv
391 hpid=pid1;
392 lpid=pid2;
393
394
395//Determine the pair code
7f92929e 396 switch (hpid) //switch on first particle id
88cb7938 397 {
398 case kNeutron:
7f92929e 399 switch (lpid)
88cb7938 400 {
401 case kNeutron:
402 code = 1; //neutron neutron
403 break;
404
405 case kProton:
406 code = 3; //neutron proton
407 break;
408
409 case kLambda0:
410 code = 28; //neutron lambda
411 break;
412
413 default:
414 return 0; //given pair not supported
415 break;
416 }
7f92929e 417 break;
88cb7938 418
419 case kProton:
7f92929e 420 switch (lpid)
88cb7938 421 {
422 case kProton:
423 code = 2; //proton proton
424 break;
425
426 case kLambda0:
427 code = 27;//proton lambda
428 break;
429
430 default:
431 return 0; //given pair not supported
432 break;
433
434 }
7f92929e 435 break;
88cb7938 436
437 case kPiPlus:
438
7f92929e 439 switch (lpid)
88cb7938 440 {
441 case kPiPlus:
442 code = 7; //piplus piplus
443 break;
444
445 case kPiMinus:
446 code = 5; //piplus piminus
447 break;
448
449 case kKMinus:
450 code = 10; //piplus Kminus
451 break;
452
453 case kKPlus:
454 code = 11; //piplus Kplus
455 break;
456
457 case kProton:
458 code = 12; //piplus proton
459 chargefactor*=-1;
460 break;
461
462 default:
463 return 0; //given pair not supported
464 break;
465 }
7f92929e 466 break;
88cb7938 467 case kPi0:
7f92929e 468 switch (lpid)
88cb7938 469 {
470 case kPi0:
471 code = 6;
472 break;
473
474 default:
475 return 0; //given pair not supported
476 break;
477 }
7f92929e 478 break;
479
88cb7938 480 case kKPlus:
7f92929e 481 switch (lpid)
88cb7938 482 {
483 case kKMinus:
484 code = 14; //Kplus Kminus
485 break;
486
487 case kKPlus:
488 code = 15; //Kplus Kplus
489 break;
490
491 case kProton:
492 code = 16; //Kplus proton
493 break;
494
495 default:
496 return 0; //given pair not supported
497 break;
498 }
7f92929e 499 break;
500
88cb7938 501 case kKMinus:
7f92929e 502 switch (lpid)
88cb7938 503 {
504 case kProton:
505 code = 17; //Kminus proton
506 chargefactor*=1;
507 break;
508
509 default:
510 return 0; //given pair not supported
511 break;
512 }
7f92929e 513 break;
514
88cb7938 515 case kK0:
7f92929e 516 switch (lpid)
88cb7938 517 {
518 case kK0:
519 code = 2; //Kzero Kzero
520 break;
521
522 case kK0Bar:
523 code = 17; //Kzero KzeroBar
524 break;
525
526 default:
527 return 0; //given pair not supported
528 break;
529 }
7f92929e 530 break;
88cb7938 531
532 default: return 0;
533 }
7f92929e 534 return code;
535}
88cb7938 536/************************************************************/
537
538void AliHBTLLWeights::SetTest(Bool_t rtest)
539{
540 //Sets fTest member
541 fTest = rtest;
542}
543/************************************************************/
544
545void AliHBTLLWeights::SetColoumb(Bool_t col)
546{
547 // (ICH in fortran code) Coulomb interaction between the two particles ON (OFF)
548 fColoumbSwitch = col;
549}
550/************************************************************/
551
552void AliHBTLLWeights::SetQuantumStatistics(Bool_t qss)
553{
554 //IQS: quantum statistics for the two particles ON (OFF)
555 //if non-identical particles automatically off
556 fQuantStatSwitch = qss;
557}
558/************************************************************/
559
560void AliHBTLLWeights::SetStrongInterSwitch(Bool_t sis)
561{
562 //ISI: strong interaction between the two particles ON (OFF)
563 fStrongInterSwitch = sis;
564}
565/************************************************************/
7f92929e 566
88cb7938 567void AliHBTLLWeights::SetColWithResidNuclSwitch(Bool_t crn)
568{
569 //I3C: Coulomb interaction with residual nucleus ON (OFF)
570 fColWithResidNuclSwitch = crn;
571}
572/************************************************************/
573
574void AliHBTLLWeights::SetApproxModel(Int_t ap)
575{
576 //sets Model of Approximation (NS in Fortran code)
577 fApproximationModel=ap;
578}
579/************************************************************/
580
581void AliHBTLLWeights::SetRandomPosition(Bool_t rp)
582{
583 //ON=kTRUE(OFF=kFALSE)
584 //ON -- calculation of the Gauss source radii
585 //if the generator don't allows the source generation (for example MeVSim)
586 //if ON the following parameters are requested:
587 fRandomPosition = rp;
588}
589/************************************************************/
590
591void AliHBTLLWeights::SetR1dw(Double_t R)
592{
593 //spherical source model radii
594 fRadius=R;
595}
596/************************************************************/
597
598void AliHBTLLWeights::SetParticlesTypes(Int_t pid1, Int_t pid2)
599{
600 //set AliRoot particles types
601 fPID1 = pid1;
602 fPID2 = pid2;
603}
604/************************************************************/
605
606void AliHBTLLWeights::SetNucleusCharge(Double_t ch)
607{
608 // not used now (see comments in fortran code)
609 fNuclCharge=ch;
610}
611/************************************************************/
612
613void AliHBTLLWeights::SetNucleusMass(Double_t mass)
614{
615 // (see comments in fortran code)
616 fNuclMass=mass;
617}