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10d100d4 | 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 | ||
16 | ////////////////////////////////////////////////////////////////////////// | |
17 | // // | |
18 | // AliHMPIDPid // | |
19 | // // | |
20 | // HMPID class to perfom particle identification // | |
21 | // // | |
22 | ////////////////////////////////////////////////////////////////////////// | |
23 | ||
24 | #include "AliHMPIDPid.h" //class header | |
25 | #include "AliHMPIDParam.h" //class header | |
26 | #include "AliHMPIDRecon.h" //class header | |
27 | #include <AliESDtrack.h> //FindPid() | |
28 | #include <TRandom.h> //Resolution() | |
29 | ||
30 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | |
f21fc003 | 31 | AliHMPIDPid::AliHMPIDPid():TNamed("HMPIDrec","HMPIDPid") |
10d100d4 | 32 | { |
33 | //.. | |
34 | //init of data members | |
35 | //.. | |
36 | } | |
37 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | |
38 | Double_t AliHMPIDPIDResponse::CosTheta(Float_t mom, Int_t species) { | |
39 | Double_t mass = AliPID::ParticleMass(species); | |
40 | TMath::Sqrt(mass*mass+pmod*pmod)/(AliHMPIDParam::Instance()->MeanIdxRad()*pmod); // evaluate the theor. Theta Cherenkov | |
41 | } | |
42 | //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ | |
43 | Double_t AliHMPIDPIDResponse::Resolution(Double_t thetaCerTh, AliESDtrack *pTrk) | |
44 | { | |
45 | AliHMPIDParam *pParam = AliHMPIDParam::Instance(); | |
46 | ||
47 | AliHMPIDRecon rec; | |
48 | Float_t xRa,yRa,thRa,phRa; | |
49 | pTrk->GetHMPIDtrk(xRa,yRa,thRa,phRa); | |
50 | rec.SetTrack(xRa,yRa,thRa,phRa); | |
51 | Double_t thetaMax = TMath::ACos(1./pParam->MeanIdxRad()); | |
52 | Int_t nPhots = (Int_t)(21.*TMath::Sin(thetaCerTh)*TMath::Sin(thetaCerTh)/(TMath::Sin(thetaMax)*TMath::Sin(thetaMax))+0.01); | |
53 | ||
54 | Double_t sigmatot = 0; | |
55 | Int_t nTrks = 20; | |
56 | for(Int_t iTrk=0;iTrk<nTrks;iTrk++) { | |
57 | Double_t invSigma = 0; | |
58 | Int_t nPhotsAcc = 0; | |
59 | for(Int_t j=0;j<nPhots;j++){ | |
60 | Double_t phi = gRandom->Rndm()*TMath::TwoPi(); | |
61 | TVector2 pos; pos=rec.TracePhot(thetaCerTh,phi); | |
62 | if(!pParam->IsInside(pos.X(),pos.Y())) continue; | |
63 | if(pParam->IsInDead(pos.X(),pos.Y())) continue; | |
64 | Double_t sigma2 = pParam->Sigma2(thRa,phRa,thetaCerTh,phi);//photon candidate sigma^2 | |
65 | if(sigma2!=0) { | |
66 | invSigma += 1./sigma2; | |
67 | nPhotsAcc++; | |
68 | } | |
69 | } | |
70 | if(invSigma!=0) sigmatot += 1./TMath::Sqrt(invSigma); | |
71 | } | |
72 | return sigmatot/nTrks; | |
73 | } |