1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
20 #include "AliFastMuonTrackingRes.h"
21 #include "AliMUONFastTracking.h"
25 ClassImp(AliFastMuonTrackingRes)
28 AliFastMuonTrackingRes::AliFastMuonTrackingRes() :
29 AliFastResponse("Resolution", "Muon Tracking Resolution")
34 void AliFastMuonTrackingRes::Init()
36 fFastTracking = AliMUONFastTracking::Instance();
37 fFastTracking->Init(fBackground);
42 void AliFastMuonTrackingRes::Evaluate(Float_t p, Float_t theta , Float_t phi,
43 Float_t& pS, Float_t& thetaS, Float_t& phiS)
46 Double_t meanp = fFastTracking->MeanP (p, theta, phi, Int_t(fCharge));
47 Double_t sigmap = fFastTracking->SigmaP (p, theta, phi, Int_t(fCharge));
48 Double_t sigma1p = fFastTracking->Sigma1P(p, theta, phi, Int_t(fCharge));
49 Double_t normg2 = fFastTracking->NormG2 (p, theta, phi, Int_t(fCharge));
50 Double_t meang2 = fFastTracking->MeanG2 (p, theta, phi, Int_t(fCharge));
51 Double_t sigmag2 = fFastTracking->SigmaG2(p, theta, phi, Int_t(fCharge));
54 TF1* fitp = fFastTracking->GetFitP();
56 fFastTracking->GetIpIthetaIphi(p, theta, phi, Int_t(fCharge), ip, itheta, iphi);
58 printf ("WARNING!!! sigmap=0: ");
59 printf ("ip= %d itheta = %d iphi = %d ", ip, itheta, iphi);
60 printf ("p= %f theta = %f phi = %f\n", p, theta, phi);
63 fitp->SetParameters(meanp,sigmap,sigma1p,normg2,meang2,sigmag2);
65 Double_t meantheta = fFastTracking->MeanTheta (p, theta, phi, Int_t(fCharge));
66 Double_t sigmatheta = fFastTracking->SigmaTheta(p, theta, phi, Int_t(fCharge));
67 Double_t meanphi = fFastTracking->MeanPhi (p, theta, phi, Int_t(fCharge));
68 Double_t sigmaphi = fFastTracking->SigmaPhi (p, theta, phi, Int_t(fCharge));
70 // Components different from ip=0 have the RMS bigger than mean
71 Float_t ptp[3] = { 1.219576,-0.354764,-0.690117 };
72 Float_t ptph[3] = { 0.977522, 0.016269, 0.023158 };
73 Float_t pphp[3] = { 1.303256,-0.464847,-0.869322 };
76 pS = p + fitp->GetRandom();
80 if (ip==0) sigmaphi *= pphp[0] + pphp[1] * dp + pphp[2] * dp*dp;
81 phiS = phi + gRandom->Gaus(meanphi, sigmaphi);
82 Float_t dphi = phiS - phi;
84 if (ip==0) sigmatheta *= ptp[0] + ptp[1] * dp + ptp[2] * dp*dp;
85 if (ip==0) sigmatheta *= ptph[0] + ptph[1] * dphi + ptph[2] * dphi*dphi;
86 thetaS = theta + gRandom->Gaus(meantheta,sigmatheta);