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 **************************************************************************/
19 //_________________________________________________________________________
20 // Base Class for JetFinder Algorithms
22 //*-- Author: Mark Horner (LBL/UCT)
27 #include "AliEMCALJetFinderAlgo.h"
29 #include "AliEMCALGeometry.h"
31 ClassImp(AliEMCALJetFinderAlgo)
33 AliEMCALJetFinderAlgo::AliEMCALJetFinderAlgo()
37 AliEMCALJetFinderAlgo::~AliEMCALJetFinderAlgo()
42 void AliEMCALJetFinderAlgo::InitInput(AliEMCALJetFinderInput* input)
45 if (fDebug>1) Info("InitInput","Beginning InitInput");
46 fInputPointer = input;
47 fOutputObject.Reset(kResetAll);
48 // automatically copy parton and particle info to output object
50 for (Int_t counter = 0 ; counter < fInputPointer->GetNPartons();counter++)
52 fOutputObject.AddParton(fInputPointer->GetParton(counter));
54 for (Int_t counter = 0 ; counter < fInputPointer->GetNParticles();counter++)
56 fOutputObject.AddParticle(fInputPointer->GetParticle(counter));
60 Float_t AliEMCALJetFinderAlgo::PropagatePhi(Float_t pt, Float_t charge, Bool_t& curls)
62 // Propagates phi angle to EMCAL radius
64 Float_t b = 0.0, rEMCAL = -1.0;
67 b = gAlice->Field()->SolenoidField();
68 rEMCAL = AliEMCALGeometry::GetInstance()->GetIPDistance();
71 Float_t rB = 3335.6 * pt / b; // [cm] (case of |charge|=1)
77 Float_t phi = TMath::ACos(1.-rEMCAL*rEMCAL/(2.*rB*rB));
78 dPhi = TMath::ATan2(1.-TMath::Cos(phi), TMath::Sin(phi));
79 dPhi = -TMath::Sign(dPhi, charge);