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1 | /************************************************************************* |
| 2 | * Copyright(c) 1998-2048, 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 | // Author: Dariusz Miskowiec <mailto:d.miskowiec@gsi.de> 2007 |
| 17 | |
| 18 | //============================================================================= |
| 19 | // parent class of all events; analyzers access data via this class |
| 20 | //============================================================================= |
| 21 | |
| 22 | #include <TMath.h> |
| 23 | #include "AliUnicorEvent.h" |
| 24 | |
| 25 | ClassImp(AliUnicorEvent) |
| 26 | |
| 27 | //============================================================================= |
| 28 | void AliUnicorEvent::RP(Double_t &qx, Double_t &qy, Int_t harmonic) const |
| 29 | { |
| 30 | // simplest flow vector |
| 31 | |
| 32 | qx=0; |
| 33 | qy=0; |
| 34 | for (int i=0; i<NParticles(); i++) { |
| 35 | if (!ParticleGood(i,0)) continue; |
| 36 | double pt = ParticlePt(i); |
| 37 | if (pt>2.0) pt = 2.0; // from 2 GeV flow saturates anyway |
| 38 | qx += pt*cos(harmonic*ParticlePhi(i)); |
| 39 | qy += pt*sin(harmonic*ParticlePhi(i)); |
| 40 | } |
| 41 | } |
| 42 | //============================================================================= |
| 43 | Double_t AliUnicorEvent::ParticleEta(Int_t i) const |
| 44 | { |
| 45 | // pseudorapidity |
| 46 | |
| 47 | double the = ParticleTheta(i); |
| 48 | if (the<0.0001) return 10; |
| 49 | else if (the>TMath::Pi()-0.0001) return -10; |
| 50 | return -log(tan(the/2)); |
| 51 | } |
| 52 | //============================================================================= |
| 53 | Double_t AliUnicorEvent::ParticleY(Int_t i, Double_t mass) const |
| 54 | { |
| 55 | // rapidity |
| 56 | |
| 57 | double pp = ParticleP(i); |
| 58 | double ee = sqrt(fabs(mass*mass + pp*pp)); |
| 59 | double pz = ParticlePz(i); |
| 60 | double yy = log((ee+pz)/(ee-pz))/2; |
| 61 | return yy; |
| 62 | } |
| 63 | //============================================================================= |
| 64 | |
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