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5ad4eb21 | 1 | // SigmaEW.h is a part of the PYTHIA event generator. |
2 | // Copyright (C) 2008 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 electroweak process differential cross sections. | |
7 | // Contains classes derived from SigmaProcess via Sigma(1/2)Process. | |
8 | ||
9 | #ifndef Pythia8_SigmaEW_H | |
10 | #define Pythia8_SigmaEW_H | |
11 | ||
12 | #include "PythiaComplex.h" | |
13 | #include "SigmaProcess.h" | |
14 | ||
15 | namespace Pythia8 { | |
16 | ||
17 | ||
18 | //************************************************************************** | |
19 | ||
20 | // A derived class for q g -> q gamma (q = u, d, s, c, b). | |
21 | // Use massless approximation also for Q since no alternative. | |
22 | ||
23 | class Sigma2qg2qgamma : public Sigma2Process { | |
24 | ||
25 | public: | |
26 | ||
27 | // Constructor. | |
28 | Sigma2qg2qgamma() {} | |
29 | ||
30 | // Calculate flavour-independent parts of cross section. | |
31 | virtual void sigmaKin(); | |
32 | ||
33 | // Evaluate d(sigmaHat)/d(tHat). | |
34 | virtual double sigmaHat(); | |
35 | ||
36 | // Select flavour, colour and anticolour. | |
37 | virtual void setIdColAcol(); | |
38 | ||
39 | // Info on the subprocess. | |
40 | virtual string name() const {return "q g -> q gamma (udscb)";} | |
41 | virtual int code() const {return 201;} | |
42 | virtual string inFlux() const {return "qg";} | |
43 | ||
44 | private: | |
45 | ||
46 | // Values stored for later use. | |
47 | double mNew, m2New, sigUS, sigma0; | |
48 | ||
49 | }; | |
50 | ||
51 | //************************************************************************** | |
52 | ||
53 | // A derived class for q qbar -> g gamma. | |
54 | ||
55 | class Sigma2qqbar2ggamma : public Sigma2Process { | |
56 | ||
57 | public: | |
58 | ||
59 | // Constructor. | |
60 | Sigma2qqbar2ggamma() {} | |
61 | ||
62 | // Calculate flavour-independent parts of cross section. | |
63 | virtual void sigmaKin(); | |
64 | ||
65 | // Evaluate d(sigmaHat)/d(tHat). | |
66 | virtual double sigmaHat(); | |
67 | ||
68 | // Select flavour, colour and anticolour. | |
69 | virtual void setIdColAcol(); | |
70 | ||
71 | // Info on the subprocess. | |
72 | virtual string name() const {return "q qbar -> g gamma";} | |
73 | virtual int code() const {return 202;} | |
74 | virtual string inFlux() const {return "qqbarSame";} | |
75 | ||
76 | private: | |
77 | ||
78 | // Values stored for later use. | |
79 | double sigma0; | |
80 | ||
81 | }; | |
82 | ||
83 | //************************************************************************** | |
84 | ||
85 | // A derived class for g g -> g gamma. | |
86 | ||
87 | class Sigma2gg2ggamma : public Sigma2Process { | |
88 | ||
89 | public: | |
90 | ||
91 | // Constructor. | |
92 | Sigma2gg2ggamma() {} | |
93 | ||
94 | // Initialize process. | |
95 | virtual void initProc(); | |
96 | ||
97 | // Calculate flavour-independent parts of cross section. | |
98 | virtual void sigmaKin(); | |
99 | ||
100 | // Evaluate d(sigmaHat)/d(tHat). | |
101 | virtual double sigmaHat() {return sigma;} | |
102 | ||
103 | // Select flavour, colour and anticolour. | |
104 | virtual void setIdColAcol(); | |
105 | ||
106 | // Info on the subprocess. | |
107 | virtual string name() const {return "g g -> g gamma";} | |
108 | virtual int code() const {return 203;} | |
109 | virtual string inFlux() const {return "gg";} | |
110 | ||
111 | private: | |
112 | ||
113 | // Values stored for later use. | |
114 | double chargeSum, sigma; | |
115 | ||
116 | }; | |
117 | ||
118 | //************************************************************************** | |
119 | ||
120 | // A derived class for f fbar -> gamma gamma. | |
121 | ||
122 | class Sigma2ffbar2gammagamma : public Sigma2Process { | |
123 | ||
124 | public: | |
125 | ||
126 | // Constructor. | |
127 | Sigma2ffbar2gammagamma() {} | |
128 | ||
129 | // Calculate flavour-independent parts of cross section. | |
130 | virtual void sigmaKin(); | |
131 | ||
132 | // Evaluate d(sigmaHat)/d(tHat). | |
133 | virtual double sigmaHat(); | |
134 | ||
135 | // Select flavour, colour and anticolour. | |
136 | virtual void setIdColAcol(); | |
137 | ||
138 | // Info on the subprocess. | |
139 | virtual string name() const {return "f fbar -> gamma gamma";} | |
140 | virtual int code() const {return 204;} | |
141 | virtual string inFlux() const {return "ffbarSame";} | |
142 | ||
143 | private: | |
144 | ||
145 | // Values stored for later use. | |
146 | double sigTU, sigma0; | |
147 | ||
148 | }; | |
149 | ||
150 | //************************************************************************** | |
151 | ||
152 | // A derived class for g g -> gamma gamma. | |
153 | ||
154 | class Sigma2gg2gammagamma : public Sigma2Process { | |
155 | ||
156 | public: | |
157 | ||
158 | // Constructor. | |
159 | Sigma2gg2gammagamma() {} | |
160 | ||
161 | // Initialize process. | |
162 | virtual void initProc(); | |
163 | ||
164 | // Calculate flavour-independent parts of cross section. | |
165 | virtual void sigmaKin(); | |
166 | ||
167 | // Evaluate d(sigmaHat)/d(tHat). | |
168 | virtual double sigmaHat() {return sigma;} | |
169 | ||
170 | // Select flavour, colour and anticolour. | |
171 | virtual void setIdColAcol(); | |
172 | ||
173 | // Info on the subprocess. | |
174 | virtual string name() const {return "g g -> gamma gamma";} | |
175 | virtual int code() const {return 205;} | |
176 | virtual string inFlux() const {return "gg";} | |
177 | ||
178 | private: | |
179 | ||
180 | double charge2Sum, sigma; | |
181 | ||
182 | }; | |
183 | ||
184 | //************************************************************************** | |
185 | ||
186 | // A derived class for f f' -> f f' via t-channel gamma*/Z0 exchange. | |
187 | ||
188 | class Sigma2ff2fftgmZ : public Sigma2Process { | |
189 | ||
190 | public: | |
191 | ||
192 | // Constructor. | |
193 | Sigma2ff2fftgmZ() {} | |
194 | ||
195 | // Initialize process. | |
196 | virtual void initProc(); | |
197 | ||
198 | // Calculate flavour-independent parts of cross section. | |
199 | virtual void sigmaKin(); | |
200 | ||
201 | // Evaluate sigmaHat(sHat). | |
202 | virtual double sigmaHat(); | |
203 | ||
204 | // Select flavour, colour and anticolour. | |
205 | virtual void setIdColAcol(); | |
206 | ||
207 | // Info on the subprocess. | |
208 | virtual string name() const {return "f f' -> f f' (t-channel gamma*/Z0)";} | |
209 | virtual int code() const {return 211;} | |
210 | virtual string inFlux() const {return "ff";} | |
211 | ||
212 | private: | |
213 | ||
214 | // Z parameters for propagator. | |
215 | int gmZmode; | |
216 | double mZ, mZS, thetaWRat, sigmagmgm, sigmagmZ, sigmaZZ; | |
217 | ||
218 | }; | |
219 | ||
220 | //************************************************************************** | |
221 | ||
222 | // A derived class for f_1 f_2 -> f_3 f_4 via t-channel W+- exchange. | |
223 | ||
224 | class Sigma2ff2fftW : public Sigma2Process { | |
225 | ||
226 | public: | |
227 | ||
228 | // Constructor. | |
229 | Sigma2ff2fftW() {} | |
230 | ||
231 | // Initialize process. | |
232 | virtual void initProc(); | |
233 | ||
234 | // Calculate flavour-independent parts of cross section. | |
235 | virtual void sigmaKin(); | |
236 | ||
237 | // Evaluate sigmaHat(sHat). | |
238 | virtual double sigmaHat(); | |
239 | ||
240 | // Select flavour, colour and anticolour. | |
241 | virtual void setIdColAcol(); | |
242 | ||
243 | // Info on the subprocess. | |
244 | virtual string name() const {return "f_1 f_2 -> f_3 f_4 (t-channel W+-)";} | |
245 | virtual int code() const {return 212;} | |
246 | virtual string inFlux() const {return "ff";} | |
247 | ||
248 | private: | |
249 | ||
250 | // W parameters for propagator. | |
251 | double mW, mWS, thetaWRat, sigma0; | |
252 | ||
253 | }; | |
254 | ||
255 | //************************************************************************** | |
256 | ||
257 | // A derived class for q q' -> Q q" via t-channel W+- exchange. | |
258 | // Related to Sigma2ff2fftW class, but with massive matrix elements. | |
259 | ||
260 | class Sigma2qq2QqtW : public Sigma2Process { | |
261 | ||
262 | public: | |
263 | ||
264 | // Constructor. | |
265 | Sigma2qq2QqtW(int idIn, int codeIn) : idNew(idIn), codeSave(codeIn) {} | |
266 | ||
267 | // Initialize process. | |
268 | virtual void initProc(); | |
269 | ||
270 | // Calculate flavour-independent parts of cross section. | |
271 | virtual void sigmaKin(); | |
272 | ||
273 | // Evaluate sigmaHat(sHat). | |
274 | virtual double sigmaHat(); | |
275 | ||
276 | // Select flavour, colour and anticolour. | |
277 | virtual void setIdColAcol(); | |
278 | ||
279 | // Evaluate weight for W decay angles in top decay (else inactive). | |
280 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
281 | ||
282 | // Info on the subprocess. | |
283 | virtual string name() const {return nameSave;} | |
284 | virtual int code() const {return codeSave;} | |
285 | virtual string inFlux() const {return "ff";} | |
286 | virtual int id3Mass() const {return idNew;} | |
287 | ||
288 | private: | |
289 | ||
290 | // Values stored for process type. W parameters for propagator. | |
291 | int idNew, codeSave; | |
292 | string nameSave; | |
293 | double mW, mWS, thetaWRat, sigma0, openFracPos, openFracNeg; | |
294 | ||
295 | }; | |
296 | ||
297 | //************************************************************************** | |
298 | ||
299 | // A derived class for f fbar -> gamma*/Z0. | |
300 | ||
301 | class Sigma1ffbar2gmZ : public Sigma1Process { | |
302 | ||
303 | public: | |
304 | ||
305 | // Constructor. | |
306 | Sigma1ffbar2gmZ() {} | |
307 | ||
308 | // Initialize process. | |
309 | virtual void initProc(); | |
310 | ||
311 | // Calculate flavour-independent parts of cross section. | |
312 | virtual void sigmaKin(); | |
313 | ||
314 | // Evaluate sigmaHat(sHat). | |
315 | virtual double sigmaHat(); | |
316 | ||
317 | // Select flavour, colour and anticolour. | |
318 | virtual void setIdColAcol(); | |
319 | ||
320 | // Evaluate weight for Z decay angle. | |
321 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
322 | ||
323 | // Info on the subprocess. | |
324 | virtual string name() const {return "f fbar -> gamma*/Z0";} | |
325 | virtual int code() const {return 221;} | |
326 | virtual string inFlux() const {return "ffbarSame";} | |
327 | virtual int resonanceA() const {return 23;} | |
328 | ||
329 | private: | |
330 | ||
331 | // Parameters set at initialization or for each new event. | |
332 | int gmZmode; | |
333 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, | |
334 | gamSum, intSum, resSum, gamProp, intProp, resProp; | |
335 | ||
336 | // Pointer to properties of the particle species, to access decay channels. | |
337 | ParticleDataEntry* particlePtr; | |
338 | ||
339 | }; | |
340 | ||
341 | //************************************************************************** | |
342 | ||
343 | // A derived class for f fbar' -> W+-. | |
344 | ||
345 | class Sigma1ffbar2W : public Sigma1Process { | |
346 | ||
347 | public: | |
348 | ||
349 | // Constructor. | |
350 | Sigma1ffbar2W() {} | |
351 | ||
352 | // Initialize process. | |
353 | virtual void initProc(); | |
354 | ||
355 | // Calculate flavour-independent parts of cross section. | |
356 | virtual void sigmaKin(); | |
357 | ||
358 | // Evaluate sigmaHat(sHat). | |
359 | virtual double sigmaHat(); | |
360 | ||
361 | // Select flavour, colour and anticolour. | |
362 | virtual void setIdColAcol(); | |
363 | ||
364 | // Evaluate weight for W decay angle. | |
365 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
366 | ||
367 | // Info on the subprocess. | |
368 | virtual string name() const {return "f fbar' -> W+-";} | |
369 | virtual int code() const {return 222;} | |
370 | virtual string inFlux() const {return "ffbarChg";} | |
371 | virtual int resonanceA() const {return 24;} | |
372 | ||
373 | private: | |
374 | ||
375 | // Parameters set at initialization. | |
376 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0Pos, sigma0Neg; | |
377 | ||
378 | // Pointer to properties of the particle species, to access decay channels. | |
379 | ParticleDataEntry* particlePtr; | |
380 | ||
381 | }; | |
382 | ||
383 | //************************************************************************** | |
384 | ||
385 | // A derived class for f fbar -> gamma* -> f' fbar', summed over light f'. | |
386 | // Allows pT-ordered evolution for multiple interactions. | |
387 | ||
388 | class Sigma2ffbar2ffbarsgm : public Sigma2Process { | |
389 | ||
390 | public: | |
391 | ||
392 | // Constructor. | |
393 | Sigma2ffbar2ffbarsgm() {} | |
394 | ||
395 | // Calculate flavour-independent parts of cross section. | |
396 | virtual void sigmaKin(); | |
397 | ||
398 | // Evaluate sigmaHat(sHat). | |
399 | virtual double sigmaHat(); | |
400 | ||
401 | // Select flavour, colour and anticolour. | |
402 | virtual void setIdColAcol(); | |
403 | ||
404 | // Info on the subprocess. | |
405 | virtual string name() const { | |
406 | return "f fbar -> f' fbar' (s-channel gamma*)";} | |
407 | virtual int code() const {return 223;} | |
408 | virtual string inFlux() const {return "ffbarSame";} | |
409 | virtual bool isSChannel() const {return true;} | |
410 | ||
411 | private: | |
412 | ||
413 | // Values stored for later use. | |
414 | int idNew; | |
415 | double sigma0; | |
416 | ||
417 | }; | |
418 | ||
419 | //************************************************************************** | |
420 | ||
421 | // A derived class for f fbar -> gamma*/Z0 -> F Fbar, for one heavy F. | |
422 | // Allows pT cuts as for other 2 -> 2 processes. | |
423 | ||
424 | class Sigma2ffbar2FFbarsgmZ : public Sigma2Process { | |
425 | ||
426 | public: | |
427 | ||
428 | // Constructor. | |
429 | Sigma2ffbar2FFbarsgmZ(int idIn, int codeIn) : idNew(idIn), | |
430 | codeSave(codeIn) {} | |
431 | ||
432 | // Initialize process. | |
433 | virtual void initProc(); | |
434 | ||
435 | // Calculate flavour-independent parts of cross section. | |
436 | virtual void sigmaKin(); | |
437 | ||
438 | // Evaluate sigmaHat(sHat). | |
439 | virtual double sigmaHat(); | |
440 | ||
441 | // Select flavour, colour and anticolour. | |
442 | virtual void setIdColAcol(); | |
443 | ||
444 | // Evaluate weight for W decay angles in top decay (else inactive). | |
445 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
446 | ||
447 | // Info on the subprocess. | |
448 | virtual string name() const {return nameSave;} | |
449 | virtual int code() const {return codeSave;} | |
450 | virtual string inFlux() const {return "ffbarSame";} | |
451 | virtual bool isSChannel() const {return true;} | |
452 | virtual int id3Mass() const {return idNew;} | |
453 | virtual int id4Mass() const {return idNew;} | |
454 | virtual int resonanceA() const {return 23;} | |
455 | ||
456 | private: | |
457 | ||
458 | // Values stored for process type. Z parameters for propagator. | |
459 | int idNew, codeSave, gmZmode; | |
460 | string nameSave; | |
461 | bool isPhysical; | |
462 | double ef, vf, af, mRes, GammaRes, m2Res, GamMRat, thetaWRat, | |
463 | mr, betaf, cosThe, gamProp, intProp, resProp, openFracPair; | |
464 | ||
465 | }; | |
466 | ||
467 | //************************************************************************** | |
468 | ||
469 | // A derived class for f fbar' -> W+- -> F fbar", for one or two heavy F. | |
470 | // Allows pT cuts as for other 2 -> 2 processes. | |
471 | ||
472 | class Sigma2ffbar2FfbarsW : public Sigma2Process { | |
473 | ||
474 | public: | |
475 | ||
476 | // Constructor. | |
477 | Sigma2ffbar2FfbarsW(int idIn, int idIn2, int codeIn) : idNew(idIn), | |
478 | idNew2(idIn2), codeSave(codeIn) {} | |
479 | ||
480 | // Initialize process. | |
481 | virtual void initProc(); | |
482 | ||
483 | // Calculate flavour-independent parts of cross section. | |
484 | virtual void sigmaKin(); | |
485 | ||
486 | // Evaluate sigmaHat(sHat). | |
487 | virtual double sigmaHat(); | |
488 | ||
489 | // Select flavour, colour and anticolour. | |
490 | virtual void setIdColAcol(); | |
491 | ||
492 | // Evaluate weight for W decay angles in top decay (else inactive). | |
493 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
494 | ||
495 | // Info on the subprocess. | |
496 | virtual string name() const {return nameSave;} | |
497 | virtual int code() const {return codeSave;} | |
498 | virtual string inFlux() const {return "ffbarChg";} | |
499 | virtual bool isSChannel() const {return true;} | |
500 | virtual int id3Mass() const {return idNew;} | |
501 | virtual int id4Mass() const {return idPartner;} | |
502 | virtual int resonanceA() const {return 24;} | |
503 | ||
504 | private: | |
505 | ||
506 | // Values stored for process type. W parameters for propagator. | |
507 | int idNew, idNew2, codeSave, idPartner; | |
508 | string nameSave; | |
509 | bool isPhysical; | |
510 | double V2New, mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0, | |
511 | openFracPos, openFracNeg; | |
512 | ||
513 | }; | |
514 | ||
515 | //************************************************************************** | |
516 | ||
517 | // An intermediate class for f fbar -> gamma*/Z0/W+- gamma*/Z0/W-+. | |
518 | ||
519 | class Sigma2ffbargmZWgmZW : public Sigma2Process { | |
520 | ||
521 | public: | |
522 | ||
523 | // Constructor. | |
524 | Sigma2ffbargmZWgmZW() {} | |
525 | ||
526 | protected: | |
527 | ||
528 | // Internal products. | |
529 | Vec4 pRot[7]; | |
530 | complex hA[7][7]; | |
531 | complex hC[7][7]; | |
532 | ||
533 | // Calculate and store internal products. | |
534 | void setupProd( Event& process, int i1, int i2, int i3, int i4, | |
535 | int i5, int i6); | |
536 | ||
537 | // Evaluate the F function of Gunion and Kunszt. | |
538 | complex fGK(int i1, int i2, int i3, int i4, int i5, int i6); | |
539 | ||
540 | // Evaluate the Xi function of Gunion and Kunszt. | |
541 | double xiGK( double tHnow, double uHnow); | |
542 | ||
543 | // Evaluate the Xj function of Gunion and Kunszt. | |
544 | double xjGK( double tHnow, double uHnow); | |
545 | ||
546 | private: | |
547 | ||
548 | }; | |
549 | ||
550 | //************************************************************************** | |
551 | ||
552 | // A derived class for f fbar -> gamma*/Z0 gamma*/Z0. | |
553 | ||
554 | class Sigma2ffbar2gmZgmZ : public Sigma2ffbargmZWgmZW { | |
555 | ||
556 | public: | |
557 | ||
558 | // Constructor. | |
559 | Sigma2ffbar2gmZgmZ() {} | |
560 | ||
561 | // Initialize process. | |
562 | virtual void initProc(); | |
563 | ||
564 | // Calculate flavour-independent parts of cross section. | |
565 | virtual void sigmaKin(); | |
566 | ||
567 | // Evaluate d(sigmaHat)/d(tHat). | |
568 | virtual double sigmaHat(); | |
569 | ||
570 | // Select flavour, colour and anticolour. | |
571 | virtual void setIdColAcol(); | |
572 | ||
573 | // Evaluate weight for simultaneous flavour choices. | |
574 | virtual double weightDecayFlav( Event& process); | |
575 | ||
576 | // Evaluate weight for decay angles of the two gamma*/Z0. | |
577 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
578 | ||
579 | // Info on the subprocess. | |
580 | virtual string name() const {return "f fbar -> gamma*/Z0 gamma*/Z0";} | |
581 | virtual int code() const {return 231;} | |
582 | virtual string inFlux() const {return "ffbarSame";} | |
583 | virtual int id3Mass() const {return 23;} | |
584 | virtual int id4Mass() const {return 23;} | |
585 | ||
586 | private: | |
587 | ||
588 | // Parameters set at initialization or for each new event. | |
589 | int gmZmode, i1, i2, i3, i4, i5, i6; | |
590 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, sigma0, | |
591 | gamSum3, intSum3, resSum3, gamProp3, intProp3, resProp3, | |
592 | gamSum4, intSum4, resSum4, gamProp4, intProp4, resProp4, | |
593 | c3LL, c3LR, c3RL, c3RR, c4LL, c4LR, c4RL, c4RR, flavWt; | |
594 | ||
595 | // Pointer to properties of the particle species, to access decay channels. | |
596 | ParticleDataEntry* particlePtr; | |
597 | ||
598 | }; | |
599 | ||
600 | //************************************************************************** | |
601 | ||
602 | // A derived class for f fbar' -> Z0 W+-. (Here pure Z0, unfortunately.) | |
603 | ||
604 | class Sigma2ffbar2ZW : public Sigma2ffbargmZWgmZW { | |
605 | ||
606 | public: | |
607 | ||
608 | // Constructor. | |
609 | Sigma2ffbar2ZW() {} | |
610 | ||
611 | // Initialize process. | |
612 | virtual void initProc(); | |
613 | ||
614 | // Calculate flavour-independent parts of cross section. | |
615 | virtual void sigmaKin(); | |
616 | ||
617 | // Evaluate d(sigmaHat)/d(tHat). | |
618 | virtual double sigmaHat(); | |
619 | ||
620 | // Select flavour, colour and anticolour. | |
621 | virtual void setIdColAcol(); | |
622 | ||
623 | // Evaluate weight for Z0 and W+- decay angles. | |
624 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
625 | ||
626 | // Info on the subprocess. | |
627 | virtual string name() const {return "f fbar' -> Z0 W+- (no gamma*!)";} | |
628 | virtual int code() const {return 232;} | |
629 | virtual string inFlux() const {return "ffbarChg";} | |
630 | virtual int id3Mass() const {return 23;} | |
631 | virtual int id4Mass() const {return 24;} | |
632 | virtual int resonanceA() const {return 24;} | |
633 | ||
634 | private: | |
635 | ||
636 | // Store W+- mass and width, and couplings. | |
637 | double mW, widW, mWS, mwWS, sin2thetaW, cos2thetaW, thetaWRat, | |
638 | thetaWpt, thetaWmm, lun, lde, sigma0, openFracPos, openFracNeg; | |
639 | ||
640 | }; | |
641 | ||
642 | //************************************************************************** | |
643 | ||
644 | // A derived class for f fbar -> W+ W-. | |
645 | ||
646 | class Sigma2ffbar2WW : public Sigma2ffbargmZWgmZW { | |
647 | ||
648 | public: | |
649 | ||
650 | // Constructor. | |
651 | Sigma2ffbar2WW() {} | |
652 | ||
653 | // Initialize process. | |
654 | virtual void initProc(); | |
655 | ||
656 | // Calculate flavour-independent parts of cross section. | |
657 | virtual void sigmaKin(); | |
658 | ||
659 | // Evaluate d(sigmaHat)/d(tHat). | |
660 | virtual double sigmaHat(); | |
661 | ||
662 | // Select flavour, colour and anticolour. | |
663 | virtual void setIdColAcol(); | |
664 | ||
665 | // Evaluate weight for W+ and W- decay angles. | |
666 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
667 | ||
668 | // Info on the subprocess. | |
669 | virtual string name() const {return "f fbar -> W+ W-";} | |
670 | virtual int code() const {return 233;} | |
671 | virtual int id3Mass() const {return 24;} | |
672 | virtual string inFlux() const {return "ffbarSame";} | |
673 | virtual int id4Mass() const {return -24;} | |
674 | virtual int resonanceA() const {return 23;} | |
675 | ||
676 | private: | |
677 | ||
678 | // Store Z0 mass and width. | |
679 | double mZ, widZ, mZS, mwZS, thetaWRat, sigma0, cgg, cgZ, cZZ, cfg, | |
680 | cfZ, cff, gSS, gTT, gST, gUU, gSU, openFracPair; | |
681 | ||
682 | }; | |
683 | ||
684 | //************************************************************************** | |
685 | ||
686 | // An intermediate class for f fbar -> gamma*/Z0 g/gamma and permutations. | |
687 | ||
688 | class Sigma2ffbargmZggm : public Sigma2Process { | |
689 | ||
690 | public: | |
691 | ||
692 | // Constructor. | |
693 | Sigma2ffbargmZggm() {} | |
694 | ||
695 | // Initialize process. | |
696 | virtual void initProc(); | |
697 | ||
698 | // Evaluate weight for gamma&/Z0 decay angle. | |
699 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
700 | ||
701 | protected: | |
702 | ||
703 | // Parameters set at initialization or for each new event. | |
704 | int gmZmode; | |
705 | double mRes, GammaRes, m2Res, GamMRat, thetaWRat, | |
706 | gamSum, intSum, resSum, gamProp, intProp, resProp; | |
707 | ||
708 | // Evaluate current sum of flavour couplings times phase space. | |
709 | void flavSum(); | |
710 | ||
711 | // Evaluate current propagator terms of cross section. | |
712 | void propTerm(); | |
713 | ||
714 | private: | |
715 | ||
716 | // Pointer to properties of the particle species, to access decay channels. | |
717 | ParticleDataEntry* particlePtr; | |
718 | ||
719 | }; | |
720 | ||
721 | //************************************************************************** | |
722 | ||
723 | // A derived class for q qbar -> gamma*/Z0 g. | |
724 | ||
725 | class Sigma2qqbar2gmZg : public Sigma2ffbargmZggm { | |
726 | ||
727 | public: | |
728 | ||
729 | // Constructor. | |
730 | Sigma2qqbar2gmZg() {} | |
731 | ||
732 | // Calculate flavour-independent parts of cross section. | |
733 | virtual void sigmaKin(); | |
734 | ||
735 | // Evaluate d(sigmaHat)/d(tHat). | |
736 | virtual double sigmaHat(); | |
737 | ||
738 | // Select flavour, colour and anticolour. | |
739 | virtual void setIdColAcol(); | |
740 | ||
741 | // Info on the subprocess. | |
742 | virtual string name() const {return "q qbar -> gamma*/Z0 g";} | |
743 | virtual int code() const {return 241;} | |
744 | virtual string inFlux() const {return "qqbarSame";} | |
745 | virtual int id3Mass() const {return 23;} | |
746 | ||
747 | private: | |
748 | ||
749 | // Values stored for later use. | |
750 | double sigma0; | |
751 | ||
752 | }; | |
753 | ||
754 | //************************************************************************** | |
755 | ||
756 | // A derived class for q g -> gamma*/Z0 q. | |
757 | ||
758 | class Sigma2qg2gmZq : public Sigma2ffbargmZggm { | |
759 | ||
760 | public: | |
761 | ||
762 | // Constructor. | |
763 | Sigma2qg2gmZq() {} | |
764 | ||
765 | // Calculate flavour-independent parts of cross section. | |
766 | virtual void sigmaKin(); | |
767 | ||
768 | // Evaluate d(sigmaHat)/d(tHat). | |
769 | virtual double sigmaHat(); | |
770 | ||
771 | // Select flavour, colour and anticolour. | |
772 | virtual void setIdColAcol(); | |
773 | ||
774 | // Info on the subprocess. | |
775 | virtual string name() const {return "q g-> gamma*/Z0 q";} | |
776 | virtual int code() const {return 242;} | |
777 | virtual string inFlux() const {return "qg";} | |
778 | virtual int id3Mass() const {return 23;} | |
779 | ||
780 | private: | |
781 | ||
782 | // Values stored for later use. | |
783 | double sigma0; | |
784 | ||
785 | }; | |
786 | ||
787 | //************************************************************************** | |
788 | ||
789 | // A derived class for f fbar' -> gamma*/Z0 gamma. | |
790 | ||
791 | class Sigma2ffbar2gmZgm : public Sigma2ffbargmZggm { | |
792 | ||
793 | public: | |
794 | ||
795 | // Constructor. | |
796 | Sigma2ffbar2gmZgm() {} | |
797 | ||
798 | // Calculate flavour-independent parts of cross section. | |
799 | virtual void sigmaKin(); | |
800 | ||
801 | // Evaluate d(sigmaHat)/d(tHat). | |
802 | virtual double sigmaHat(); | |
803 | ||
804 | // Select flavour, colour and anticolour. | |
805 | virtual void setIdColAcol(); | |
806 | ||
807 | // Info on the subprocess. | |
808 | virtual string name() const {return "f fbar -> gamma*/Z0 gamma";} | |
809 | virtual int code() const {return 243;} | |
810 | virtual string inFlux() const {return "ffbarSame";} | |
811 | virtual int id3Mass() const {return 23;} | |
812 | ||
813 | private: | |
814 | ||
815 | // Values stored for later use. | |
816 | double sigma0; | |
817 | ||
818 | }; | |
819 | ||
820 | //************************************************************************** | |
821 | ||
822 | // A derived class for f gamma -> gamma*/Z0 f. | |
823 | ||
824 | class Sigma2fgm2gmZf : public Sigma2ffbargmZggm { | |
825 | ||
826 | public: | |
827 | ||
828 | // Constructor. | |
829 | Sigma2fgm2gmZf() {} | |
830 | ||
831 | // Calculate flavour-independent parts of cross section. | |
832 | virtual void sigmaKin(); | |
833 | ||
834 | // Evaluate d(sigmaHat)/d(tHat). | |
835 | virtual double sigmaHat(); | |
836 | ||
837 | // Select flavour, colour and anticolour. | |
838 | virtual void setIdColAcol(); | |
839 | ||
840 | // Info on the subprocess. | |
841 | virtual string name() const {return "f gamma -> gamma*/Z0 f";} | |
842 | virtual int code() const {return 244;} | |
843 | virtual string inFlux() const {return "fgm";} | |
844 | virtual int id3Mass() const {return 23;} | |
845 | ||
846 | private: | |
847 | ||
848 | // Values stored for later use. | |
849 | double sigma0; | |
850 | ||
851 | }; | |
852 | ||
853 | //************************************************************************** | |
854 | ||
855 | // An intermediate class for f fbar -> W+- g/gamma and permutations. | |
856 | ||
857 | class Sigma2ffbarWggm : public Sigma2Process { | |
858 | ||
859 | public: | |
860 | ||
861 | // Constructor. | |
862 | Sigma2ffbarWggm() {} | |
863 | ||
864 | // Evaluate weight for gamma&/Z0 decay angle. | |
865 | virtual double weightDecay( Event& process, int iResBeg, int iResEnd); | |
866 | ||
867 | private: | |
868 | ||
869 | }; | |
870 | ||
871 | //************************************************************************** | |
872 | ||
873 | // A derived class for q qbar' -> W+- g. | |
874 | ||
875 | class Sigma2qqbar2Wg : public Sigma2ffbarWggm { | |
876 | ||
877 | public: | |
878 | ||
879 | // Constructor. | |
880 | Sigma2qqbar2Wg() {} | |
881 | ||
882 | // Initialize process. | |
883 | virtual void initProc(); | |
884 | ||
885 | // Calculate flavour-independent parts of cross section. | |
886 | virtual void sigmaKin(); | |
887 | ||
888 | // Evaluate d(sigmaHat)/d(tHat). | |
889 | virtual double sigmaHat(); | |
890 | ||
891 | // Select flavour, colour and anticolour. | |
892 | virtual void setIdColAcol(); | |
893 | ||
894 | // Info on the subprocess. | |
895 | virtual string name() const {return "q qbar' -> W+- g";} | |
896 | virtual int code() const {return 251;} | |
897 | virtual string inFlux() const {return "ffbarChg";} | |
898 | virtual int id3Mass() const {return 24;} | |
899 | ||
900 | private: | |
901 | ||
902 | // Values stored for later use. | |
903 | double sigma0, openFracPos, openFracNeg; | |
904 | ||
905 | }; | |
906 | ||
907 | //************************************************************************** | |
908 | ||
909 | // A derived class for q g -> W+- q'. | |
910 | ||
911 | class Sigma2qg2Wq : public Sigma2ffbarWggm { | |
912 | ||
913 | public: | |
914 | ||
915 | // Constructor. | |
916 | Sigma2qg2Wq() {} | |
917 | ||
918 | // Initialize process. | |
919 | virtual void initProc(); | |
920 | ||
921 | // Calculate flavour-independent parts of cross section. | |
922 | virtual void sigmaKin(); | |
923 | ||
924 | // Evaluate d(sigmaHat)/d(tHat). | |
925 | virtual double sigmaHat(); | |
926 | ||
927 | // Select flavour, colour and anticolour. | |
928 | virtual void setIdColAcol(); | |
929 | ||
930 | // Info on the subprocess. | |
931 | virtual string name() const {return "q g-> W+- q'";} | |
932 | virtual int code() const {return 252;} | |
933 | virtual string inFlux() const {return "qg";} | |
934 | virtual int id3Mass() const {return 24;} | |
935 | ||
936 | private: | |
937 | ||
938 | // Values stored for later use. | |
939 | double sigma0, openFracPos, openFracNeg; | |
940 | ||
941 | }; | |
942 | ||
943 | //************************************************************************** | |
944 | ||
945 | // A derived class for f fbar' -> W+- gamma. | |
946 | ||
947 | class Sigma2ffbar2Wgm : public Sigma2ffbarWggm { | |
948 | ||
949 | public: | |
950 | ||
951 | // Constructor. | |
952 | Sigma2ffbar2Wgm() {} | |
953 | ||
954 | // Initialize process. | |
955 | virtual void initProc(); | |
956 | ||
957 | // Calculate flavour-independent parts of cross section. | |
958 | virtual void sigmaKin(); | |
959 | ||
960 | // Evaluate d(sigmaHat)/d(tHat). | |
961 | virtual double sigmaHat(); | |
962 | ||
963 | // Select flavour, colour and anticolour. | |
964 | virtual void setIdColAcol(); | |
965 | ||
966 | // Info on the subprocess. | |
967 | virtual string name() const {return "f fbar' -> W+- gamma";} | |
968 | virtual int code() const {return 253;} | |
969 | virtual string inFlux() const {return "ffbarChg";} | |
970 | virtual int id3Mass() const {return 24;} | |
971 | ||
972 | private: | |
973 | ||
974 | // Values stored for later use. | |
975 | double sigma0, openFracPos, openFracNeg; | |
976 | ||
977 | }; | |
978 | ||
979 | //************************************************************************** | |
980 | ||
981 | // A derived class for f gamma -> W+- f'. | |
982 | ||
983 | class Sigma2fgm2Wf : public Sigma2ffbarWggm { | |
984 | ||
985 | public: | |
986 | ||
987 | // Constructor. | |
988 | Sigma2fgm2Wf() {} | |
989 | ||
990 | // Initialize process. | |
991 | virtual void initProc(); | |
992 | ||
993 | // Calculate flavour-independent parts of cross section. | |
994 | virtual void sigmaKin(); | |
995 | ||
996 | // Evaluate d(sigmaHat)/d(tHat). | |
997 | virtual double sigmaHat(); | |
998 | ||
999 | // Select flavour, colour and anticolour. | |
1000 | virtual void setIdColAcol(); | |
1001 | ||
1002 | // Info on the subprocess. | |
1003 | virtual string name() const {return "f gamma -> W+- f'";} | |
1004 | virtual int code() const {return 254;} | |
1005 | virtual string inFlux() const {return "fgm";} | |
1006 | virtual int id3Mass() const {return 24;} | |
1007 | ||
1008 | private: | |
1009 | ||
1010 | // Values stored for later use. | |
1011 | double sigma0, openFracPos, openFracNeg; | |
1012 | ||
1013 | }; | |
1014 | ||
1015 | //************************************************************************** | |
1016 | ||
1017 | } // end namespace Pythia8 | |
1018 | ||
1019 | #endif // Pythia8_SigmaEW_H |