1 | #ifndef _CLUSTER_HH_ |
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2 | #define _CLUSTER_HH_ |
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3 | |
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4 | //---------------------------------------------------------------------- |
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5 | // This file distributed with FastJet has been obtained from |
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6 | // http://www.pa.msu.edu/~huston/Les_Houches_2005/JetClu+Midpoint-StandAlone.tgz |
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7 | // |
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8 | // Permission to distribute it with FastJet has been granted by Joey |
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9 | // Huston (see the COPYING file in the main FastJet directory for |
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10 | // details). |
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11 | // Changes from the original file are listed below. |
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12 | //---------------------------------------------------------------------- |
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13 | |
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14 | // History of changes compared to the original Cluster.hh file |
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15 | // |
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16 | // 2009-01-17 Gregory Soyez <soyez@fastjet.fr> |
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17 | // |
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18 | // * put the code in the fastjet::cdf namespace |
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19 | // |
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20 | // 2007-03-10 Gavin Salam <salam@lpthe.jussieu.fr> |
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21 | // |
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22 | // * added support for the pttilde scale choice in the CDF midpoint code |
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23 | // |
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24 | // 2006-09-24 Gavin Salam <salam@lpthe.jussieu.fr> |
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25 | // |
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26 | // * added JetClu+MidPoint to FastJet |
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27 | |
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28 | #include "PhysicsTower.hh" |
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29 | #include "LorentzVector.hh" |
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30 | #include "Centroid.hh" |
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31 | #include <vector> |
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32 | |
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33 | #include <fastjet/internal/base.hh> |
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34 | |
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35 | FASTJET_BEGIN_NAMESPACE |
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36 | |
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37 | namespace cdf{ |
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38 | |
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39 | class Cluster |
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40 | { |
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41 | public: |
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42 | std::vector<PhysicsTower> towerList; |
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43 | LorentzVector fourVector; |
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44 | Centroid centroid; |
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45 | // addition by G.P.Salam; pt_tilde = sum |p_{ti}|. Maintaining this |
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46 | // seems to add about 1% (3%) to overall timings for midpoint |
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47 | // (jetclu) but it is useful because it makes it easy to look at |
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48 | // other scales in the split-merge procedure |
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49 | double pt_tilde; |
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50 | |
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51 | Cluster() |
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52 | { |
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53 | clear(); |
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54 | } |
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55 | void clear() |
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56 | { |
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57 | towerList.clear(); |
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58 | fourVector = LorentzVector(); |
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59 | centroid = Centroid(); |
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60 | pt_tilde = 0.0; |
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61 | } |
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62 | void addTower(PhysicsTower p) |
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63 | { |
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64 | towerList.push_back(p); |
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65 | fourVector.add(p.fourVector); |
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66 | centroid.add(Centroid(p.Et(),p.eta(),p.phi())); |
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67 | pt_tilde += p.fourVector.pt(); |
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68 | } |
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69 | void removeTower(PhysicsTower p) |
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70 | { |
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71 | for(std::vector<PhysicsTower>::iterator towerIter = towerList.begin(); towerIter != towerList.end(); towerIter++) |
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72 | if(towerIter->isEqual(p)){ |
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73 | fourVector.subtract(towerIter->fourVector); |
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74 | centroid.subtract(Centroid(towerIter->Et(),towerIter->eta(),towerIter->phi())); |
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75 | pt_tilde -= towerIter->fourVector.pt(); |
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76 | towerList.erase(towerIter); |
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77 | break; |
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78 | } |
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79 | } |
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80 | int size(){return towerList.size();} |
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81 | }; |
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82 | |
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83 | } // namespace cdf |
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84 | |
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85 | FASTJET_END_NAMESPACE |
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86 | |
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87 | #endif |
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