]>
Commit | Line | Data |
---|---|---|
4ebdd20e | 1 | #include <TMath.h> |
2 | #include <TH2.h> | |
3 | #include <TProfile.h> | |
4 | ||
5 | #include <iostream> | |
6 | ||
7 | using namespace std; | |
8 | ||
9 | const Double_t eMass = 0.000511; //electron mass | |
10 | const Double_t piMass = 0.13957; //pion mass | |
11 | const Double_t kMass = 0.493676999999999977; //kaon mass | |
12 | const Double_t pMass = 0.938271999999999995; //proton mass | |
13 | ||
14 | ||
15 | Double_t fitf3G(Double_t* xx, Double_t* par); | |
16 | Double_t FitFunc(Double_t* x, Double_t *par); | |
17 | Double_t SigmaFunc(Double_t* x, Double_t *par); | |
18 | ||
19 | TH2D* hDeDxVsP = 0; | |
20 | TProfile* hMeanP = 0; | |
21 | Double_t fixMIP = 50.0; | |
22 | Double_t fixPlateau = 75.0; | |
23 | ||
909cb566 | 24 | |
25 | class DeDxFitInfo : public TObject | |
26 | { | |
27 | public: | |
28 | ||
29 | DeDxFitInfo(); | |
30 | void Print(Option_t* option="") const; | |
31 | ||
32 | Double_t MIP; | |
33 | Double_t plateau; | |
34 | ||
35 | Int_t optionDeDx; | |
36 | Int_t nDeDxPar; | |
37 | Double_t parDeDx[8]; | |
38 | ||
39 | Int_t optionSigma; | |
40 | Int_t nSigmaPar; | |
41 | Double_t parSigma[8]; | |
42 | ||
43 | TString calibFileName; | |
44 | ||
45 | ClassDef(DeDxFitInfo, 1); // Help class | |
46 | }; | |
47 | ||
48 | //_____________________________________________________________________________ | |
49 | ClassImp(DeDxFitInfo) | |
50 | ||
51 | DeDxFitInfo::DeDxFitInfo(): | |
52 | TObject(), | |
53 | MIP(0), | |
54 | plateau(0), | |
55 | optionDeDx(-1), | |
56 | nDeDxPar(-1), | |
57 | optionSigma(-1), | |
58 | nSigmaPar(-1), | |
59 | calibFileName("") | |
60 | { | |
61 | // default constructor | |
62 | for(Int_t i = 0; i < 8; i++) { | |
63 | parDeDx[i] = 0; | |
64 | parSigma[i] = 0; | |
65 | } | |
66 | } | |
67 | ||
68 | //_________________________________________________________ | |
69 | void DeDxFitInfo::Print(Option_t* option) const | |
70 | { | |
71 | if(option) | |
72 | cout << "Option: " << option << endl; | |
73 | ||
74 | cout << ClassName() << " : " << GetName() << endl | |
75 | << "MIP: " << MIP << endl | |
76 | << "Plateau: " << plateau << endl | |
77 | << "OptionDeDx: " << optionDeDx << endl | |
78 | << "nDeDxPar: " << nDeDxPar << endl; | |
79 | for(Int_t i = 0; i < nDeDxPar; i++) { | |
80 | ||
81 | cout << "parDeDx[" << i << "] = " << parDeDx[i] << endl; | |
82 | } | |
83 | cout << "OptionSigma: " << optionSigma << endl | |
84 | << "nSigmaPar: " << nSigmaPar << endl; | |
85 | for(Int_t i = 0; i < nSigmaPar; i++) { | |
86 | ||
87 | cout << "parSigma[" << i << "] = " << parSigma[i] << endl; | |
88 | } | |
89 | ||
90 | if(calibFileName.IsNull()) { | |
91 | cout << "No eta calibration file." << endl; | |
92 | } else { | |
93 | cout << "Eta calibration file: " << calibFileName.Data() << endl; | |
94 | } | |
95 | } | |
96 | ||
4ebdd20e | 97 | //______________________________________________________________________________ |
98 | Double_t fitf3G(Double_t* xx, Double_t* par) | |
99 | { | |
100 | // | |
101 | // Could speed up fit by forcing it to use <p>. In that way the parameters | |
102 | // could be amde statis cand only changed when going to a new p bin | |
103 | // | |
104 | Double_t p = xx[0]; | |
105 | Double_t dedx = xx[1]; | |
106 | ||
107 | const Int_t bin = hDeDxVsP->GetXaxis()->FindBin(p); | |
108 | ||
109 | if(hMeanP) { | |
110 | // cout << "p before: " << p; | |
111 | p = hMeanP->GetBinContent(bin); | |
112 | // cout << ", p after: " << p << endl; | |
113 | } | |
114 | const Int_t binStart = Int_t(par[0]); | |
115 | const Int_t binStop = Int_t(par[1]); | |
116 | ||
117 | if(bin<binStart || bin>binStop) { | |
118 | ||
119 | cout << "Error: bin " << bin << " not inside inteval [" << binStart | |
120 | << "; " << binStop << "]" << endl; | |
121 | return 0; | |
122 | } | |
123 | ||
124 | const Int_t nParDeDx = Int_t(par[2]); | |
125 | ||
126 | Double_t* parDeDx = &par[3]; | |
127 | ||
128 | Int_t offset = 4 + nParDeDx; // binStart + binStop + nParDeDx + optionDedx + nParDeDx parameters | |
129 | ||
130 | const Int_t nParSigma = Int_t(par[offset]); | |
131 | offset += 1; // nParSigma | |
132 | ||
133 | Double_t* parSigma = &par[offset]; | |
134 | offset += 1 + nParSigma; // optionSigma + nParSigma parameters | |
135 | ||
136 | Double_t piMean = FitFunc(&p, parDeDx); | |
137 | Double_t pKeff = p*piMass/kMass; // corresponding p of a pion with same dE/dx | |
138 | Double_t kMean = FitFunc(&pKeff, parDeDx); | |
139 | Double_t pPeff = p*piMass/pMass; // corresponding p of a pion with same dE/dx | |
140 | Double_t pMean = FitFunc(&pPeff, parDeDx); | |
141 | ||
142 | const Double_t piSigma = SigmaFunc(&piMean, parSigma); | |
143 | const Double_t kSigma = SigmaFunc(&kMean, parSigma); | |
144 | const Double_t pSigma = SigmaFunc(&pMean, parSigma); | |
145 | ||
146 | ||
147 | const Int_t j = bin - binStart; | |
148 | const Double_t piYield = par[j * 3 + offset + 0]; | |
149 | const Double_t kYield = par[j * 3 + offset + 1]; | |
150 | const Double_t pYield = par[j * 3 + offset + 2]; | |
151 | ||
152 | return piYield* TMath::Gaus(dedx, piMean, piSigma, kTRUE) | |
153 | + kYield * TMath::Gaus(dedx, kMean, kSigma, kTRUE) | |
154 | + pYield * TMath::Gaus(dedx, pMean, pSigma, kTRUE); | |
155 | } | |
156 | ||
157 | ||
158 | //______________________________________________________________________________ | |
159 | Double_t FitFunc(Double_t* x, Double_t *par) | |
160 | { | |
161 | static const Double_t bgMIP = 0.5/piMass; | |
162 | static const Double_t beta2MIP = bgMIP*bgMIP / (1.0+bgMIP*bgMIP); | |
163 | // static const Double_t betapowMIP = TMath; | |
164 | static const Double_t logMIP = TMath::Log(1+bgMIP); | |
165 | ||
909cb566 | 166 | |
167 | ||
168 | Int_t option = TMath::Nint(par[0]); | |
4ebdd20e | 169 | Int_t specie = option; |
170 | option = option%10; | |
171 | specie -= option; | |
172 | specie /= 10; | |
173 | ||
174 | ||
175 | Double_t bg = 0; | |
176 | switch (specie) { | |
177 | ||
178 | case 0: // pion | |
179 | bg = x[0]/piMass; | |
180 | break; | |
181 | case 1: // kaon | |
182 | bg = x[0]/kMass; | |
183 | break; | |
184 | case 2: // proton | |
185 | bg = x[0]/pMass; | |
186 | break; | |
187 | case 3: // electron | |
188 | bg = x[0]/eMass; | |
189 | break; | |
909cb566 | 190 | case 4: // just use bg |
191 | bg = x[0]; | |
192 | break; | |
4ebdd20e | 193 | default: |
194 | cout << "Error in FitFunc: specie " << specie << " not supported!!!!!" << endl; | |
195 | return 0; | |
196 | break; | |
197 | } | |
198 | ||
909cb566 | 199 | |
4ebdd20e | 200 | if(bg > 10000.0) |
201 | bg = 10000.0; | |
202 | ||
203 | const Double_t beta2 = bg*bg / (1.0+bg*bg); | |
204 | ||
205 | switch (option) { | |
206 | ||
207 | case 1: // standard parametrisation | |
208 | { | |
209 | /* | |
210 | c0/beta^2 + c1 * log (1+x) | |
211 | */ | |
212 | const Double_t c0 = par[1]; | |
213 | const Double_t c1 = par[2]; | |
214 | ||
215 | const Double_t value = c0/beta2 + c1*TMath::Log(1+bg); | |
216 | return value; | |
217 | } | |
218 | break; | |
219 | case 2: // fix the dE/dx to 50 at 0.5 GeV/c | |
220 | { | |
221 | const Double_t c1 = par[1]; | |
222 | const Double_t c0 = (fixMIP-par[1]*logMIP) * beta2MIP; | |
223 | ||
224 | const Double_t value = c0/beta2 + c1*TMath::Log(1+bg); | |
225 | return value; | |
226 | } | |
227 | break; | |
228 | case 3: // fix the dE/dx to 50 at 0.5 GeV/c and the plateau to 75 | |
229 | { | |
230 | /* | |
231 | a/beta^2 + b/c*log( (1+x)^c / (1 + d*(1+x)^c) ) | |
232 | ||
233 | Assymptotic behavior: | |
234 | ||
235 | 1) Small bg (and d small so that d*(1+x)^c << 1) | |
236 | ||
237 | a/beta^2 + b * log (1+x) | |
238 | ||
239 | So this is the same beavior as the standard expression. | |
240 | ||
241 | 2) Large bg where d*(1+x)^c >> 1 | |
242 | a - b/c*log(d) = plateau | |
243 | -> d = exp(c*(a-plateau)/b) | |
244 | ||
245 | */ | |
246 | const Double_t b = par[1]; | |
247 | const Double_t a = (fixMIP-par[1]*logMIP) * beta2MIP; | |
248 | const Double_t c = par[2]; | |
249 | const Double_t d = TMath::Exp(c*(a-fixPlateau)/b); | |
250 | ||
251 | // cout << bg << ": " << a << ", " << b << ", " << c << ", " << d << endl; | |
252 | ||
253 | const Double_t powbg = TMath::Power(1.0+bg, c); | |
254 | ||
255 | const Double_t value = a/beta2 + b/c*TMath::Log(powbg/(1.0 + d*powbg)); | |
256 | return value; | |
257 | } | |
258 | break; | |
259 | case 4: // fix the dE/dx to 50 at 0.5 GeV/c and the plateau to 75 | |
260 | { | |
261 | /* | |
262 | a/beta^2 + b/c*log( (1+x)^c / (1 + d*(1+x)^c) ) | |
263 | ||
264 | Assymptotic behavior: | |
265 | ||
266 | 1) Small bg (and d small so that d*(1+x)^c << 1) | |
267 | ||
268 | a/beta^2 + b * log (1+x) | |
269 | ||
270 | So this is the same beavior as the standard expression. | |
271 | ||
272 | 2) Large bg where d*(1+x)^c >> 1 | |
273 | a - b/c*log(d) = plateau | |
274 | -> d = exp(c*(a-plateau)/b) | |
275 | ||
276 | */ | |
277 | const Double_t a = par[1]; | |
278 | const Double_t b = par[2]; | |
279 | const Double_t c = par[3]; | |
280 | const Double_t d = TMath::Exp(c*(a-fixPlateau)/b); | |
281 | ||
282 | // cout << bg << ": " << a << ", " << b << ", " << c << ", " << d << endl; | |
283 | ||
284 | const Double_t powbg = TMath::Power(1.0+bg, c); | |
285 | ||
286 | const Double_t value = a/beta2 + b/c*TMath::Log(powbg/(1.0 + d*powbg)); | |
287 | return value; | |
288 | } | |
289 | break; | |
909cb566 | 290 | case 5: // fix the dE/dx to 50 at 0.5 GeV/c and the plateau to 75 |
291 | { | |
292 | /* | |
293 | a/beta^2 + b/c*log( (1+x)^c / (1 + d*(1+x)^c) ) | |
294 | ||
295 | Assymptotic behavior: | |
296 | ||
297 | 1) Small bg (and d small so that d*(1+x)^c << 1) | |
298 | ||
299 | a/beta^2 + b * log (1+x) | |
300 | ||
301 | So this is the same beavior as the standard expression. | |
302 | ||
303 | 2) Large bg where d*(1+x)^c >> 1 | |
304 | a - b/c*log(d) = plateau | |
305 | -> d = exp(c*(a-plateau)/b) | |
306 | ||
307 | */ | |
308 | const Double_t a = par[1]; | |
309 | const Double_t b = par[2]; | |
310 | const Double_t c = par[3]; | |
311 | const Double_t d = TMath::Exp(c*(a-fixPlateau)/b); | |
312 | const Double_t e = par[4]; | |
313 | ||
314 | // cout << bg << ": " << a << ", " << b << ", " << c << ", " << d << endl; | |
315 | ||
316 | const Double_t powbg = TMath::Power(1.0+bg, c); | |
317 | ||
318 | const Double_t value = a/TMath::Power(beta2,e) + b/c*TMath::Log(powbg/(1.0 + d*powbg)); | |
319 | return value; | |
320 | } | |
321 | break; | |
322 | case 6: | |
323 | { | |
324 | /* | |
325 | a/beta^(e/2) + b/c*log( (1+x)^c / (1 + d*(1+x)^c) ) | |
326 | ||
327 | Assymptotic behavior: | |
328 | ||
329 | 1) Small bg (and d small so that d*(1+x)^c << 1) | |
330 | ||
331 | a/beta^(e/2) + b * log (1+x) | |
332 | ||
333 | So this is the same beavior as the standard expression. | |
334 | ||
335 | 2) Large bg where d*(1+x)^c >> 1 | |
336 | a - b/c*log(d) = plateau | |
337 | -> d = exp(c*(a-plateau)/b) | |
338 | ||
339 | In this version we have 2 plateaus!!!! | |
340 | Plateau 1 = electrons! | |
341 | ||
342 | */ | |
343 | if(specie==3) | |
344 | return fixPlateau; | |
345 | ||
346 | const Double_t a = par[1]; | |
347 | const Double_t b = par[2]; | |
348 | const Double_t c = par[3]; | |
349 | const Double_t d = TMath::Exp(c*(a-par[5])/b); | |
350 | const Double_t e = par[4]; | |
351 | ||
352 | // cout << bg << ": " << a << ", " << b << ", " << c << ", " << d << endl; | |
353 | ||
354 | const Double_t powbg = TMath::Power(1.0+bg, c); | |
355 | ||
356 | const Double_t value = a/TMath::Power(beta2,e) + b/c*TMath::Log(powbg/(1.0 + d*powbg)); | |
357 | return value; | |
358 | } | |
359 | break; | |
360 | case 7: | |
361 | { | |
362 | /* | |
363 | a/beta^(d/2) - b*log( c + 1.0/(1.0+x) ) | |
364 | ||
365 | Assymptotic behavior: | |
366 | ||
367 | 1) Small bg (and d small so that d*(1+x)^c << 1) | |
368 | ||
369 | a/beta^(d/2) - b * log (1+x) | |
370 | ||
371 | So this is the same beavior as the standard expression. | |
372 | ||
373 | 2) Large bg where c << 1 | |
374 | -b*log(c) = plateau-a | |
375 | -> c = exp((a-plateau)/b) | |
376 | ||
377 | */ | |
378 | const Double_t a = par[1]; | |
379 | const Double_t b = par[2]; | |
380 | const Double_t c = TMath::Exp((a-fixPlateau)/b); | |
381 | const Double_t d = par[3]; | |
382 | ||
383 | // cout << bg << ": " << a << ", " << b << ", " << c << ", " << d << endl; | |
384 | ||
385 | const Double_t value = a/TMath::Power(beta2,d) - b*TMath::Log(c + 1.0/(1.0+bg)); | |
386 | return value; | |
387 | } | |
388 | case 8: | |
389 | { | |
390 | /* | |
391 | a/beta^(d/2) - b*log( c + 1.0/(1.0+x^e) ) | |
392 | ||
393 | Assymptotic behavior: | |
394 | ||
395 | 1) Small bg (and d small so that d*(1+x)^c << 1) | |
396 | ||
397 | a/beta^(d/2) - b * log (1+x^e) | |
398 | ||
399 | So this is the same beavior as the standard expression. | |
400 | ||
401 | 2) Large bg where c << 1 | |
402 | -b*log(c) = plateau-a | |
403 | -> c = exp((a-plateau)/b) | |
404 | ||
405 | */ | |
406 | const Double_t a = par[1]; | |
407 | const Double_t b = par[2]; | |
408 | const Double_t c = TMath::Exp((a-fixPlateau)/b); | |
409 | const Double_t d = par[3]; | |
410 | const Double_t e = par[4]; | |
411 | ||
412 | // cout << bg << ": " << a << ", " << b << ", " << c << ", " << d << endl; | |
413 | ||
414 | const Double_t value = a/TMath::Power(beta2,d) - b*TMath::Log(c + 1.0/(1.0+bg) + e/(1.0+TMath::Power(bg, 2))); | |
415 | return value; | |
416 | } | |
417 | break; | |
4ebdd20e | 418 | // case 3: // fix the dE/dx to 50 at 0.5 GeV/c + powerlaw |
419 | ||
420 | // static const bgMIP = 0.5/piMass; | |
421 | // static const beta2MIP = bgMIP*bgMIP / (1.0+bgMIP*bgMIP); | |
422 | // static const logMIP = TMath::Log(1+bgMIP); | |
423 | ||
424 | // const Double_t c1 = par[1]; | |
425 | // const Double_t c2 = par[2]; // expect it to be 0.75 from Bichsel (beta**-1.5 instead of -2) | |
426 | // const Double_t c0 = (50.0-par[1]*logMIP) * beta2MIP; | |
427 | ||
428 | // const Double_t value = TMathh::Power(c0/beta2, c2) + c1*TMath::Log(1+bg); | |
429 | // return value; | |
430 | ||
431 | default: | |
432 | break; | |
433 | } | |
434 | ||
435 | cout << "Error in FitFunc: option " << option << " not supported!!!!!" << endl; | |
436 | return 0; | |
437 | } | |
438 | ||
439 | //______________________________________________________________________________ | |
440 | Double_t SigmaFunc(Double_t* x, Double_t *par) | |
441 | { | |
442 | Int_t option = Int_t(par[0]); | |
443 | ||
444 | switch (option) { | |
445 | case 1: // fixed sigma | |
446 | return par[1]; | |
447 | break; | |
448 | case 2: // relative sigma | |
449 | return par[1]*x[0]; | |
450 | break; | |
451 | case 3: // relative sigma + extrapolation | |
452 | return (par[1] + (x[0]-fixMIP)*par[2])*x[0]; | |
453 | break; | |
454 | case 4: // relative sigma with dE/dx to some power close to 1 | |
455 | return par[1]*TMath::Power(x[0], par[2]); | |
456 | break; | |
457 | case 5: // relative sigma with dE/dx to some power close to 1 | |
458 | return TMath::Sqrt(par[1]*par[1]*x[0]*x[0] + par[2]*par[2]); | |
459 | break; | |
909cb566 | 460 | case 6: // relative sigma with dE/dx to some power close to 1 |
461 | return par[1]*x[0]*TMath::Power(x[0]/50.0, par[2]); | |
462 | break; | |
463 | case 7: // 1/x^some power + constant | |
464 | return x[0]*(par[2]*TMath::Power(x[0], -par[3]) + par[1]); | |
465 | break; | |
466 | case 8: // for fitting relative sigma | |
467 | return par[2]*TMath::Power(x[0], -par[3]) + par[1]; | |
468 | break; | |
469 | case 9: // for fitting relative sigma | |
470 | return par[1]+par[2]*x[0]+par[3]*x[0]*x[0]; | |
471 | break; | |
472 | case 10: // for fitting relative sigma | |
473 | return par[1]+par[2]*x[0]+par[3]*x[0]*x[0]-par[4]/(x[0]*x[0]*x[0])-par[5]/(x[0]*x[0]); | |
474 | break; | |
475 | case 11: // for fitting relative sigma | |
476 | return x[0]*(par[1]+par[2]*x[0]+par[3]*x[0]*x[0]-par[4]/(x[0]*x[0]*x[0])-par[5]/(x[0]*x[0])); | |
477 | break; | |
478 | case 12: // for fitting relative sigma | |
479 | return par[1]+par[2]*x[0]+par[3]*x[0]*x[0]; | |
480 | break; | |
481 | case 13: // for fitting relative sigma | |
482 | return x[0]*(par[1]+par[2]*x[0]+par[3]*x[0]*x[0]); | |
483 | break; | |
484 | case 14: // for fitting relative sigma | |
485 | return par[1]+par[2]*x[0]; | |
486 | break; | |
487 | case 15: // for fitting relative sigma | |
488 | return x[0]*(par[1]+par[2]*x[0]); | |
489 | break; | |
490 | ||
491 | ||
492 | ||
493 | ||
494 | ||
495 | ||
4ebdd20e | 496 | default: |
497 | break; | |
498 | } | |
499 | ||
500 | cout << "Error in SigmaFunc: option " << option << " not supported!!!!!" << endl; | |
501 | return 0; | |
502 | } |