| 1 | //----------------------------------------------------------------------
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| 2 | // This file distributed with FastJet has been obtained from SpartyJet
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| 3 | // v2.20.0 by Pierre-Antoine Delsart, Kurtis L. Geerlings, Joey
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| 4 | // Huston, Brian T. Martin and Chris Vermilion
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| 5 | // For details, see http://www.pa.msu.edu/~huston/SpartyJet/
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| 6 | // http://projects.hepforge.org/spartyjet/
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| 7 | //
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| 8 | // Changes from the original file are listed below.
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| 9 | //----------------------------------------------------------------------
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| 10 |
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| 11 | // History of changes from the original JetDistance.hh file in
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| 12 | // SpartyJet v2.20
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| 13 | //
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| 14 | // 2009-01-15 Gregory Soyez <soyez@fastjet.fr>
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| 15 | //
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| 16 | // * put the code in the fastjet::atlas namespace
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| 17 |
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| 18 | #ifndef JETUTIL_JETDISTANCES_H
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| 19 | #define JETUTIL_JETDISTANCES_H
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| 20 |
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| 21 |
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| 22 | #include "Jet.hh"
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| 23 |
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| 24 | #include <cmath>
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| 25 |
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| 26 | #include <fastjet/internal/base.hh>
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| 27 |
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| 28 | FASTJET_BEGIN_NAMESPACE
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| 29 |
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| 30 | namespace atlas {
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| 31 |
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| 32 | struct JetDistances {
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| 33 |
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| 34 |
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| 35 | // distance in eta
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| 36 | inline static double deltaEta(const Jet& jet1, const Jet& jet2)
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| 37 | { return jet1.eta() - jet2.eta(); }
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| 38 | inline static double deltaEta(const Jet* jet1,
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| 39 | const Jet* jet2)
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| 40 | { return jet1->eta() - jet2->eta(); }
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| 41 | inline static double deltaEta(const double eta1,
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| 42 | const double eta2)
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| 43 | { return (eta1 - eta2); }
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| 44 |
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| 45 |
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| 46 |
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| 47 | inline static double deltaPhi(const Jet& jet1,
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| 48 | const Jet& jet2)
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| 49 | {
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| 50 | return fixedPhi(jet1.phi() - jet2.phi());
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| 51 | }
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| 52 | inline static double deltaPhi(const Jet* jet1,
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| 53 | const Jet* jet2)
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| 54 | {
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| 55 | return fixedPhi(jet1->phi()-jet2->phi());
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| 56 | }
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| 57 | inline static double deltaPhi(const double phi1,
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| 58 | const double phi2)
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| 59 | {
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| 60 | return fixedPhi( phi1 - phi2 );
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| 61 | }
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| 62 |
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| 63 |
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| 64 | // distance in (eta,phi)
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| 65 | inline static double deltaR(const Jet& jet1,
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| 66 | const Jet& jet2)
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| 67 | { return sqrt( deltaEta(jet1,jet2) * deltaEta(jet1,jet2) +
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| 68 | deltaPhi(jet1,jet2) * deltaPhi(jet1,jet2) ); }
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| 69 | inline static double deltaR(const Jet* jet1,
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| 70 | const Jet* jet2)
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| 71 | { return sqrt( deltaEta(jet1,jet2) * deltaEta(jet1,jet2) +
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| 72 | deltaPhi(jet1,jet2) * deltaPhi(jet1,jet2) ); }
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| 73 |
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| 74 | inline static double deltaR(const double eta1, const double phi1,
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| 75 | const double eta2, const double phi2 )
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| 76 | { return sqrt( deltaEta(eta1,eta2) * deltaEta(eta1,eta2) +
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| 77 | deltaPhi(phi1,phi2) * deltaPhi(phi1,phi2) ); }
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| 78 |
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| 79 |
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| 80 |
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| 81 | // phi convention enforcement
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| 82 | inline static double fixedPhi(double aPhi)
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| 83 | {
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| 84 | while ( aPhi < -M_PI )
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| 85 | {
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| 86 | aPhi += 2.*M_PI;
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| 87 | }
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| 88 | while ( aPhi > M_PI )
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| 89 | {
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| 90 | aPhi -= 2.*M_PI;
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| 91 | }
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| 92 | return aPhi;
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| 93 | }
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| 94 |
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| 95 | };
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| 96 |
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| 97 | } // namespace atlas
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| 98 |
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| 99 | FASTJET_END_NAMESPACE
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| 100 | #endif
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