Coding Convention
[u/mrichter/AliRoot.git] / FASTSIM / AliFastMuonTrackingRes.cxx
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6255180c 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
d53fc881 16/*
17$Log$
de4a225a 18Revision 1.4 2003/08/05 16:14:20 morsch
19Some problems with too big fluctuations corrected. (A. de Falco)
20
d53fc881 21Revision 1.1 2003/01/06 10:13:09 morsch
22First commit.
23
24*/
6255180c 25
26#include "AliFastMuonTrackingRes.h"
27#include "AliMUONFastTracking.h"
28#include <TRandom.h>
29#include <TF1.h>
30
31ClassImp(AliFastMuonTrackingRes)
32
33
34AliFastMuonTrackingRes::AliFastMuonTrackingRes() :
35 AliFastResponse("Resolution", "Muon Tracking Resolution")
36{
37 SetBackground();
38}
39
40void AliFastMuonTrackingRes::Init()
41{
42 fFastTracking = AliMUONFastTracking::Instance();
43 fFastTracking->Init(fBackground);
44}
45
46
47
48void AliFastMuonTrackingRes::Evaluate(Float_t p, Float_t theta , Float_t phi,
49 Float_t& pS, Float_t& thetaS, Float_t& phiS)
50{
51
52 Double_t meanp = fFastTracking->MeanP (p, theta, phi, Int_t(fCharge));
53 Double_t sigmap = fFastTracking->SigmaP (p, theta, phi, Int_t(fCharge));
54 Double_t sigma1p = fFastTracking->Sigma1P(p, theta, phi, Int_t(fCharge));
55 Double_t normg2 = fFastTracking->NormG2 (p, theta, phi, Int_t(fCharge));
56 Double_t meang2 = fFastTracking->MeanG2 (p, theta, phi, Int_t(fCharge));
57 Double_t sigmag2 = fFastTracking->SigmaG2(p, theta, phi, Int_t(fCharge));
58
59 Int_t ip,itheta,iphi;
6255180c 60 fFastTracking->GetIpIthetaIphi(p, theta, phi, Int_t(fCharge), ip, itheta, iphi);
d53fc881 61 TF1* fitp = fFastTracking->GetFitP(ip,itheta,iphi);
62
63 Float_t curmeanp = fitp->GetParameter(0);
64 Float_t cursigmap = fitp->GetParameter(1);
65 Float_t cursigma1p = fitp->GetParameter(2);
66 Float_t curnormg2 = fitp->GetParameter(3);
67 Float_t curmeang2 = fitp->GetParameter(4);
68 Float_t cursigmag2 = fitp->GetParameter(5);
69 if (curmeanp != meanp || cursigmap != sigmap || cursigma1p != sigma1p ||
70 curnormg2 != normg2 || curmeang2 != meang2 || cursigmag2 != sigmag2){
71 printf ("Setting new parameters for ip=%d itheta=%d iphi=%d\n",ip,itheta,iphi);
72 fitp->SetParameters(meanp,sigmap,sigma1p,normg2,meang2,sigmag2);
6255180c 73 }
6255180c 74
75 Double_t meantheta = fFastTracking->MeanTheta (p, theta, phi, Int_t(fCharge));
76 Double_t sigmatheta = fFastTracking->SigmaTheta(p, theta, phi, Int_t(fCharge));
77 Double_t meanphi = fFastTracking->MeanPhi (p, theta, phi, Int_t(fCharge));
78 Double_t sigmaphi = fFastTracking->SigmaPhi (p, theta, phi, Int_t(fCharge));
d53fc881 79
de4a225a 80 if (sigmatheta<0 || sigmaphi<0)
d53fc881 81 printf ("bin %d %d %d sigmatheta = %f, sigmaphi = %f\n",
82 ip,itheta,iphi,sigmatheta,sigmaphi);
6255180c 83 // Components different from ip=0 have the RMS bigger than mean
84 Float_t ptp[3] = { 1.219576,-0.354764,-0.690117 };
85 Float_t ptph[3] = { 0.977522, 0.016269, 0.023158 };
86 Float_t pphp[3] = { 1.303256,-0.464847,-0.869322 };
87
88 // Smeared momentum
d53fc881 89 pS = -1.;
90 // Float_t dpmax = 5. + ip * 2.5;
91 // Float_t dpmax = 5. + ip * 2;
92 Float_t dpmax;
93 if (sigmag2<999.) dpmax = 5. * (sigmap + sigmag2);
94 else dpmax = 5. * sigmap;
95 Float_t dp = 100;
96 while (pS<0 || TMath::Abs(dp)>dpmax) {
97 pS = p + fitp->GetRandom();
98 dp = pS - p;
99 }
6255180c 100 // Smeared phi
d53fc881 101 Float_t sigmaphiold=sigmaphi;
6255180c 102 if (ip==0) sigmaphi *= pphp[0] + pphp[1] * dp + pphp[2] * dp*dp;
d53fc881 103 if (sigmaphi<0.5 * sigmaphiold) sigmaphi = 0.5 * sigmaphiold;
104 if (sigmaphi>2. * sigmaphiold) sigmaphi = 2. * sigmaphiold;
6255180c 105 phiS = phi + gRandom->Gaus(meanphi, sigmaphi);
106 Float_t dphi = phiS - phi;
107 // Smeared theta
d53fc881 108 Float_t sigmathetaold=sigmatheta;
6255180c 109 if (ip==0) sigmatheta *= ptp[0] + ptp[1] * dp + ptp[2] * dp*dp;
110 if (ip==0) sigmatheta *= ptph[0] + ptph[1] * dphi + ptph[2] * dphi*dphi;
d53fc881 111 if (sigmatheta<0.5 * sigmathetaold) sigmatheta = 0.5 * sigmathetaold;
112 if (sigmatheta>2. * sigmathetaold) sigmatheta = 2. * sigmathetaold;
6255180c 113 thetaS = theta + gRandom->Gaus(meantheta,sigmatheta);
114}
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