[d7d2da3] | 1 | #ifndef D0RunIconeJets_HepEntityPre96_class
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| 2 | #define D0RunIconeJets_HepEntityPre96_class
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| 3 |
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| 4 | #include "inline_maths.h"
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| 5 | #include "HepEntityI.h"
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| 6 | #include <fastjet/internal/base.hh>
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| 7 |
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| 8 | FASTJET_BEGIN_NAMESPACE
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| 9 |
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| 10 | namespace d0runi{
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| 11 |
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| 12 | //Author: Lars Sonnenschein 25/Feb/2010
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| 13 | //This is an example class fulfilling the minimal requirements needed by the
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| 14 | //D0 RunI cone jet algorithm implementation prior to 1996, which is an inlined template class
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| 15 | //See FERMILAB-Pub-97-242-E for details
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| 16 |
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| 17 | // This file is distributed with FastJet under the terms of the GNU
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| 18 | // General Public License (v2). Permission to do so has been granted
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| 19 | // by Lars Sonnenschein and the D0 collaboration (see COPYING for
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| 20 | // details)
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| 21 | //
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| 22 | // History of changes in FastJet compared tothe original version of
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| 23 | // HepEntity.h
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| 24 | //
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| 25 | // 2011-12-13 Gregory Soyez <soyez@fastjet.fr>
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| 26 | //
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| 27 | // * added license information
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| 28 | //
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| 29 | // 2011-11-14 Gregory Soyez <soyez@fastjet.fr>
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| 30 | //
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| 31 | // * removed some harmless warnings coming with the -Wshadow gcc option
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| 32 | //
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| 33 | // 2011-10-06 Gregory Soyez <soyez@fastjet.fr>
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| 34 | //
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| 35 | // * put the code in the fastjet::d0runi namespace
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| 36 |
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| 37 | class HepEntityIpre96 : public HepEntityI {
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| 38 |
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| 39 | public:
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| 40 |
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| 41 | HepEntityIpre96() {
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| 42 | Et=0.;
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| 43 | eta=0.;
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| 44 | phi=0.;
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| 45 | Ex=0.;
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| 46 | Ey=0.;
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| 47 | Ez=0.;
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| 48 | index = -1;
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| 49 | phi_pre96=0.;
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| 50 | eta_pre96=0.;
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| 51 |
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| 52 | return;
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| 53 | }
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| 54 |
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| 55 |
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| 56 | HepEntityIpre96(double E_in, double px_in, double py_in, double pz_in,
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| 57 | int index_in = -1) : index(index_in) {
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| 58 | //Snowmass Et scheme
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| 59 | double pt = sqrt(px_in*px_in+py_in*py_in);
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| 60 | double p = sqrt(pt*pt+pz_in*pz_in);
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| 61 | phi = inline_maths::phi(px_in,py_in);
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| 62 | double theta = asin(pt/p);
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| 63 | eta = inline_maths::eta(theta);
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| 64 |
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| 65 | Et = E_in*sin(theta);
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| 66 |
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| 67 | phi_pre96 = phi;
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| 68 | eta_pre96 = eta;
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| 69 |
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| 70 | Ex = Et*cos(phi_pre96);
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| 71 | Ey = Et*sin(phi_pre96);
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| 72 | Ez = Et*sinh(eta_pre96);
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| 73 |
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| 74 | return;
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| 75 | }
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| 76 |
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| 77 |
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| 78 | inline double px() const {
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| 79 | return Et*cos(phi_pre96);
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| 80 | }
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| 81 |
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| 82 | inline double py() const {
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| 83 | return Et*sin(phi_pre96);
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| 84 | }
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| 85 |
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| 86 | inline double pz() const {
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| 87 | return Et*sinh(eta_pre96);
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| 88 | }
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| 89 |
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| 90 | inline double E() const {
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| 91 | return Et*cosh(eta_pre96);
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| 92 | }
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| 93 |
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| 94 |
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| 95 | inline void Add(const HepEntityIpre96 el) {
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| 96 | //assumes Et, eta and phi stored accurately
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| 97 | double w2 = el.Et;
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| 98 | Et += el.Et;
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| 99 | w2 /= Et;
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| 100 |
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| 101 | eta += w2*(el.eta - eta);
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| 102 | phi += w2*inline_maths::delta_phi(el.phi, phi);
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| 103 |
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| 104 |
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| 105 | Ex += el.Ex;
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| 106 | Ey += el.Ey;
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| 107 | Ez += el.Ez;
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| 108 | phi_pre96 = atan2(Ey, Ex);
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| 109 | double theta_pre96 = atan2(sqrt(Ex*Ex+Ey*Ey),Ez);
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| 110 | eta_pre96 = -log(tan(theta_pre96/2.));
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| 111 |
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| 112 | return;
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| 113 | }
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| 114 |
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| 115 |
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| 116 | inline void Fill(double E_in, double px_in, double py_in, double pz_in, int index_in) {
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| 117 | double pt = sqrt(px_in*px_in+py_in*py_in);
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| 118 | double p = sqrt(pt*pt+pz_in*pz_in);
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| 119 | phi = inline_maths::phi(px_in,py_in);
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| 120 | double theta = asin(pt/p);
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| 121 | eta = inline_maths::eta(theta);
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| 122 |
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| 123 | Et = E_in*sin(theta);
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| 124 |
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| 125 |
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| 126 | phi_pre96 = phi;
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| 127 | eta_pre96 = eta;
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| 128 |
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| 129 | Ex = Et*cos(phi_pre96);
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| 130 | Ey = Et*sin(phi_pre96);
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| 131 | Ez = Et*sinh(eta_pre96);
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| 132 |
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| 133 | index = index_in;
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| 134 |
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| 135 | return;
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| 136 | }
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| 137 |
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| 138 |
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| 139 | double Ex;
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| 140 | double Ey;
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| 141 | double Ez;
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| 142 | int index;
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| 143 | double phi_pre96;
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| 144 | double eta_pre96;
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| 145 |
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| 146 | private:
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| 147 |
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| 148 |
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| 149 |
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| 150 | };
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| 151 | //end of class HepEntityIpre96;
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| 152 |
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| 153 | } // end of namespace d0runi
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| 154 |
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| 155 | FASTJET_END_NAMESPACE
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| 156 |
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| 157 | #endif
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