Initialization of data members in the default constructor
[u/mrichter/AliRoot.git] / THerwig / THerwig6.cxx
CommitLineData
2d8d4543 1// definition of c++ Class THerwig6 to be used in ROOT
2// this is a c++ interface to the F77 Herwig6 program
3// author: j. g. contreras jgcn@moni.mda.cinvestav.mx
4// date: december 22, 2000
884ccf6a 5// Class THerwig6 is an interface to the Herwig program
6//
7// C-----------------------------------------------------------------------
8// C H E R W I G
9// C
10// C a Monte Carlo event generator for simulating
11// C +---------------------------------------------------+
12// C | Hadron Emission Reactions With Interfering Gluons |
13// C +---------------------------------------------------+
14// C I.G. Knowles(*), G. Marchesini(+), M.H. Seymour($) and B.R. Webber(#)
15// C-----------------------------------------------------------------------
16// C with Minimal Supersymmetric Standard Model Matrix Elements by
17// C S. Moretti($) and K. Odagiri($)
18// C-----------------------------------------------------------------------
19// C R parity violating Supersymmetric Decays and Matrix Elements by
20// C P. Richardson(&)
21// C-----------------------------------------------------------------------
22// C matrix element corrections to top decay and Drell-Yan type processes
23// C by G. Corcella(+)
24// C-----------------------------------------------------------------------
25// C Deep Inelastic Scattering and Heavy Flavour Electroproduction by
26// C G. Abbiendi(@) and L. Stanco(%)
27// C-----------------------------------------------------------------------
28// C and Jet Photoproduction in Lepton-Hadron Collisions by J. Chyla(~)
29// C-----------------------------------------------------------------------
30// C(*) Department of Physics & Astronomy, University of Edinburgh
31// C(+) Dipartimento di Fisica, Universita di Milano
32// C($) Rutherford Appleton Laboratory
33// C(#) Cavendish Laboratory, Cambridge
34// C(&) Department of Physics, University of Oxford
35// C(@) Dipartimento di Fisica, Universita di Bologna
36// C(%) Dipartimento di Fisica, Universita di Padova
37// C(~) Institute of Physics, Prague
38// C-----------------------------------------------------------------------
39// C Version 6.100 - 16th December 1999
40// C-----------------------------------------------------------------------
41// C Main reference:
42// C G.Marchesini, B.R.Webber, G.Abbiendi, I.G.Knowles, M.H.Seymour,
43// C and L.Stanco, Computer Physics Communications 67 (1992) 465.
44// C-----------------------------------------------------------------------
45// C Please send e-mail about this program to one of the authors at the
46// C following Internet addresses:
47// C I.Knowles@ed.ac.uk Giuseppe.Marchesini@mi.infn.it
48// C M.Seymour@rl.ac.uk webber@hep.phy.cam.ac.uk
49// C-----------------------------------------------------------------------
50
2d8d4543 51
2d8d4543 52#include "THerwig6.h"
53#include "TClonesArray.h"
54#include "TParticle.h"
884ccf6a 55#include "TObjArray.h"
2d8d4543 56
57
58ClassImp(THerwig6)
59
60extern "C" {
61 void* herwig6_common_block_address_(char*, int len);
62 void herwig6_open_fortran_file_ (int* lun, char* name, int);
63 void herwig6_close_fortran_file_(int* lun);
64}
65
66
67THerwig6::THerwig6() : TGenerator("Herwig6","Herwig6") {
68
69// THerwig6 constructor: creates a TClonesArray in which it will store all
70// particles. Note that there may be only one functional THerwig6 object
71// at a time, so it's not use to create more than one instance of it.
72
73 delete fParticles; // was allocated as TObjArray in TGenerator
74
75 fParticles = new TClonesArray("TParticle",50);
76
77 // initialize common-blocks
78 fHepevt = (Hepevt_t*) herwig6_common_block_address_((char*)"HEPEVT",6);
79 fHwbeam = (Hwbeam_t*) herwig6_common_block_address_((char*)"HWBEAM",6);
80 fHwbmch = (Hwbmch_t*) herwig6_common_block_address_((char*)"HWBMCH",6);
81 fHwproc = (Hwproc_t*) herwig6_common_block_address_((char*)"HWPROC",6);
82 fHwpram = (Hwpram_t*) herwig6_common_block_address_((char*)"HWPRAM",6);
83 fHwprch = (Hwprch_t*) herwig6_common_block_address_((char*)"HWPRCH",6);
84 fHwpart = (Hwpart_t*) herwig6_common_block_address_((char*)"HWPART",6);
85 fHwparp = (Hwparp_t*) herwig6_common_block_address_((char*)"HWPARP",6);
86 fHwbosc = (Hwbosc_t*) herwig6_common_block_address_((char*)"HWBOSC",6);
87 fHwparc = (Hwparc_t*) herwig6_common_block_address_((char*)"HWPARC",6);
88 fHwbrch = (Hwbrch_t*) herwig6_common_block_address_((char*)"HWBRCH",6);
89 fHwevnt = (Hwevnt_t*) herwig6_common_block_address_((char*)"HWEVNT",6);
90 fHwhard = (Hwhard_t*) herwig6_common_block_address_((char*)"HWHARD",6);
91 fHwprop = (Hwprop_t*) herwig6_common_block_address_((char*)"HWPROP",6);
92 fHwunam = (Hwunam_t*) herwig6_common_block_address_((char*)"HWUNAM",6);
93 fHwupdt = (Hwupdt_t*) herwig6_common_block_address_((char*)"HWUPDT",6);
94 fHwuwts = (Hwuwts_t*) herwig6_common_block_address_((char*)"HWUWTS",6);
95 fHwuclu = (Hwuclu_t*) herwig6_common_block_address_((char*)"HWUCLU",6);
96 fHwdist = (Hwdist_t*) herwig6_common_block_address_((char*)"HWDIST",6);
97 fHwqdks = (Hwqdks_t*) herwig6_common_block_address_((char*)"HWQDKS",6);
98 fHwusud = (Hwusud_t*) herwig6_common_block_address_((char*)"HWUSUD",6);
99 fHwsusy = (Hwsusy_t*) herwig6_common_block_address_((char*)"HWSUSY",6);
100 fHwrpar = (Hwrpar_t*) herwig6_common_block_address_((char*)"HWRPAR",6);
101 fHwminb = (Hwminb_t*) herwig6_common_block_address_((char*)"HWMINB",6);
102 fHwclus = (Hwclus_t*) herwig6_common_block_address_((char*)"HWCLUS",6);
103 }
104
105//------------------------------------------------------------------------------
106 THerwig6::~THerwig6()
107 {
bbc19b09 108 // Destructor. The data members of TGenerator are delete by itself
2d8d4543 109 }
110
111//______________________________________________________________________________
112void THerwig6::GenerateEvent()
113{
114
115 //initialize event
116 hwuine_();
117 // generate hard subprocess
118 hwepro_();
119 // generate parton cascades
120 hwbgen_();
121 // do heavy objects decay
122 hwdhob_();
123 // do cluster formation
124 hwcfor_();
125 // do cluster decays
126 hwcdec_();
127 // do unstable particle decays
128 hwdhad_();
129 // do heavy flavor hadrons decay
130 hwdhvy_();
131 // add soft underlying event
132 hwmevt_();
133 // finish event
134 hwufne_();
135}
136
137//______________________________________________________________________________
138void THerwig6::OpenFortranFile(int lun, char* name) {
139 herwig6_open_fortran_file_(&lun, name, strlen(name));
140}
141
142//______________________________________________________________________________
143void THerwig6::CloseFortranFile(int lun) {
144 herwig6_close_fortran_file_(&lun);
145}
146
147void THerwig6::Initialize(const char *beam, const char *target, double pbeam1, double pbeam2, int iproc)
148
149{
150 // perform the initialization for Herwig6
151 // sets correct title.
152 // after calling this method all parameters are set to their default
153 // values. If you want to modify any parameter you have to set the new
154 // value after calling Initialize and before PrepareRun.
155
156 char cbeam[8];
157 strncpy(cbeam,beam,8);
158 char ctarget[8];
159 strncpy(ctarget,target,8);
160 printf("\n Initializing Herwig !! \n");
161 if ( (!strncmp(beam, "E+" ,2)) &&
162 (!strncmp(beam, "E-" ,2)) &&
163 (!strncmp(beam, "MU+" ,3)) &&
164 (!strncmp(beam, "MU-" ,3)) &&
165 (!strncmp(beam, "NUE" ,3)) &&
166 (!strncmp(beam, "NUEB" ,4)) &&
167 (!strncmp(beam, "NUMU" ,4)) &&
168 (!strncmp(beam, "NMUB" ,4)) &&
169 (!strncmp(beam, "NTAU" ,4)) &&
170 (!strncmp(beam, "NTAB" ,4)) &&
171 (!strncmp(beam, "GAMA" ,4)) &&
172 (!strncmp(beam, "P ",8)) &&
173 (!strncmp(beam, "PBAR ",8)) &&
174 (!strncmp(beam, "N" ,1)) &&
175 (!strncmp(beam, "NBAR" ,4)) &&
176 (!strncmp(beam, "PI+" ,3)) &&
177 (!strncmp(beam, "PI-" ,3)) ) {
178 printf("WARNING! In THerwig6:Initialize():\n");
179 printf(" specified beam=%s is unrecognized .\n",beam);
180 printf(" resetting to \"P\" .");
181 sprintf(cbeam,"P");
182 }
183
184 if ( (!strncmp(target, "E+" ,2)) &&
185 (!strncmp(target, "E-" ,2)) &&
186 (!strncmp(target, "MU+" ,3)) &&
187 (!strncmp(target, "MU-" ,3)) &&
188 (!strncmp(target, "NUE" ,3)) &&
189 (!strncmp(target, "NUEB" ,4)) &&
190 (!strncmp(target, "NUMU" ,4)) &&
191 (!strncmp(target, "NMUB" ,4)) &&
192 (!strncmp(target, "NTAU" ,4)) &&
193 (!strncmp(target, "NTAB" ,4)) &&
194 (!strncmp(target, "GAMA" ,4)) &&
195 (!strncmp(target, "P ",8)) &&
196 (!strncmp(target, "PBAR ",8)) &&
197 (!strncmp(target, "N" ,1)) &&
198 (!strncmp(target, "NBAR" ,4)) &&
199 (!strncmp(target, "PI+" ,3)) &&
200 (!strncmp(target, "PI-" ,3)) ) {
201 printf("WARNING! In THerwig6:Initialize():\n");
202 printf(" specified target=%s is unrecognized .\n",target);
203 printf(" resetting to \"P\" .");
204 sprintf(ctarget,"P");
205 }
206
207 // initialization:
208 // type of beams
209 strncpy(fHwbmch->PART1,beam,8);
210 strncpy(fHwbmch->PART2,target,8);
211 // momentum of beams
212 fHwproc->PBEAM1=pbeam1;
213 fHwproc->PBEAM2=pbeam2;
214 // process to generate
215 fHwproc->IPROC=iproc;
216 // not used in the class definition
217 fHwproc->MAXEV=1;
218
219 // reset all parameters
220 hwigin_();
221
222 // set correct title
223 char atitle[132];
224 double win=pbeam1+pbeam2;
225 printf("\n %s - %s at %g GeV",beam,target,win);
226 sprintf(atitle,"%s-%s at %g GeV",cbeam,ctarget,win);
227 SetTitle(atitle);
228}
229
230void THerwig6::PrepareRun()
231{
232 // compute parameter dependent constants
233 hwuinc_();
234 // initialize elementary processes
235 hweini_();
236}
237
238//______________________________________________________________________________
239TObjArray* THerwig6::ImportParticles(Option_t *option)
240{
241//
242// Default primary creation method. It reads the /HEPEVT/ common block which
243// has been filled by the GenerateEvent method. If the event generator does
244// not use the HEPEVT common block, This routine has to be overloaded by
245// the subclasses.
246// The default action is to store only the stable particles (ISTHEP = 1)
247// This can be demanded explicitly by setting the option = "Final"
248// If the option = "All", all the particles are stored.
249//
250 fParticles->Clear();
251 Int_t numpart = fHepevt->NHEP;
252 TClonesArray &a = *((TClonesArray*)fParticles);
253 if (!strcmp(option,"") || !strcmp(option,"Final")) {
254 for (Int_t i = 0; i<=numpart; i++) {
255 if (fHepevt->ISTHEP[i] == 1) {
256//
257// Use the common block values for the TParticle constructor
258//
259 new(a[i]) TParticle(
260 fHepevt->IDHEP[i],
261 fHepevt->ISTHEP[i],
262 fHepevt->JMOHEP[i][0]-1,
263 fHepevt->JMOHEP[i][1]-1,
264 fHepevt->JDAHEP[i][0]-1,
265 fHepevt->JDAHEP[i][1]-1,
266
267 fHepevt->PHEP[i][0],
268 fHepevt->PHEP[i][1],
269 fHepevt->PHEP[i][2],
270 fHepevt->PHEP[i][3],
271 fHepevt->VHEP[i][0],
272 fHepevt->VHEP[i][1],
273 fHepevt->VHEP[i][2],
274 fHepevt->VHEP[i][3]);
275 }
276 }
277 }
278 else if (!strcmp(option,"All")) {
279 for (Int_t i = 0; i<=numpart; i++) {
280 new(a[i]) TParticle(
281 fHepevt->IDHEP[i],
282 fHepevt->ISTHEP[i],
283 fHepevt->JMOHEP[i][0]-1,
284 fHepevt->JMOHEP[i][1]-1,
285 fHepevt->JDAHEP[i][0]-1,
286 fHepevt->JDAHEP[i][1]-1,
287
288 fHepevt->PHEP[i][0],
289 fHepevt->PHEP[i][1],
290 fHepevt->PHEP[i][2],
291 fHepevt->PHEP[i][3],
292 fHepevt->VHEP[i][0],
293 fHepevt->VHEP[i][1],
294 fHepevt->VHEP[i][2],
295 fHepevt->VHEP[i][3]);
296 }
297 }
298 return fParticles;
299}
300
301//______________________________________________________________________________
302Int_t THerwig6::ImportParticles(TClonesArray *particles, Option_t *option)
303{
304//
305// Default primary creation method. It reads the /HEPEVT/ common block which
306// has been filled by the GenerateEvent method. If the event generator does
307// not use the HEPEVT common block, This routine has to be overloaded by
308// the subclasses.
309// The function loops on the generated particles and store them in
310// the TClonesArray pointed by the argument particles.
311// The default action is to store only the stable particles (ISTHEP = 1)
312// This can be demanded explicitly by setting the option = "Final"
313// If the option = "All", all the particles are stored.
314//
315 if (particles == 0) return 0;
884ccf6a 316 TClonesArray &refParticles = *particles;
317 refParticles.Clear();
2d8d4543 318 Int_t numpart = fHepevt->NHEP;
319 if (!strcmp(option,"") || !strcmp(option,"Final")) {
320 for (Int_t i = 0; i< numpart; i++) {
321 if (fHepevt->ISTHEP[i] == 1) {
322//
323// Use the common block values for the TParticle constructor
324//
884ccf6a 325 new(refParticles[i]) TParticle(
2d8d4543 326 fHepevt->IDHEP[i],
327 fHepevt->ISTHEP[i],
328 fHepevt->JMOHEP[i][0]-1,
329 fHepevt->JMOHEP[i][1]-1,
330 fHepevt->JDAHEP[i][0]-1,
331 fHepevt->JDAHEP[i][1]-1,
332
333 fHepevt->PHEP[i][0],
334 fHepevt->PHEP[i][1],
335 fHepevt->PHEP[i][2],
336 fHepevt->PHEP[i][3],
337 fHepevt->VHEP[i][0],
338 fHepevt->VHEP[i][1],
339 fHepevt->VHEP[i][2],
340 fHepevt->VHEP[i][3]);
341 }
342 }
343 }
344 else if (!strcmp(option,"All")) {
345 for (Int_t i = 0; i< numpart; i++) {
884ccf6a 346 new(refParticles[i]) TParticle(
2d8d4543 347 fHepevt->IDHEP[i],
348 fHepevt->ISTHEP[i],
349 fHepevt->JMOHEP[i][0]-1,
350 fHepevt->JMOHEP[i][1]-1,
351 fHepevt->JDAHEP[i][0]-1,
352 fHepevt->JDAHEP[i][1]-1,
353
354 fHepevt->PHEP[i][0],
355 fHepevt->PHEP[i][1],
356 fHepevt->PHEP[i][2],
357 fHepevt->PHEP[i][3],
358 fHepevt->VHEP[i][0],
359 fHepevt->VHEP[i][1],
360 fHepevt->VHEP[i][2],
361 fHepevt->VHEP[i][3]);
362 }
363 }
364 return numpart;
365}
366
367void THerwig6::Hwigin()
368{
369 hwigin_();
370}
371
372void THerwig6::Hwuinc()
373{
374 hwuinc_();
375}
376
377void THerwig6::Hwusta(char* name)
378
379{
380 hwusta_(name,8);
381}
382
383void THerwig6::Hweini()
384
385{
386 hweini_();
387}
388
389void THerwig6::Hwuine()
390
391{
392 hwuine_();
393}
394
395void THerwig6::Hwepro()
396
397{
398 hwepro_();
399}
400
401void THerwig6::Hwbgen()
402
403{
404 hwbgen_();
405}
406
407void THerwig6::Hwdhob()
408
409{
410 hwdhob_();
411}
412
413void THerwig6::Hwcfor()
414
415{
416 hwcfor_();
417}
418
419void THerwig6::Hwcdec()
420
421{
422 hwcdec_();
423}
424
425void THerwig6::Hwdhad()
426
427{
428 hwdhad_();
429}
430
431void THerwig6::Hwdhvy()
432
433{
434 hwdhvy_();
435}
436
437void THerwig6::Hwmevt()
438
439{
440 hwmevt_();
441}
442
443void THerwig6::Hwufne()
444
445{
446 hwufne_();
447}
448
449void THerwig6::Hwefin()
450
451{
452 hwefin_();
453}
454
455void THerwig6::SetupTest()
456{
457 // exampe of running herwig and generating one event
458 // after changing some options
459 Initialize("P","PBAR",900.,900.,1500);
460 // here you can set some parameters
461 SetPTMIN(15.); // Min pt in hadronic jet production
462 SetYJMIN(-4.); // Min jet rapidity
463 SetYJMAX(4.); // Max jet rapidity
464 // after you set your wished parameters
465 // herwig can do its work
466 PrepareRun();
884ccf6a 467 int nEvToGenerate=1;
468 for (int i=0;i<nEvToGenerate;i++)
2d8d4543 469 {
470 GenerateEvent();
471 // do your stuff. For ex:
884ccf6a 472 int nOfPar=GetNumberOfParticles(); // from TGenerator
473 for (int j=0; j<nOfPar; j++)
2d8d4543 474 {
475 TParticle* p=GetParticle(j);
476 // here you do whatever you want with the particle
477 p->Print();
478 };
479 };
480}
481
482
483
484
485