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## Rivet analyses reference

### D0_2011_I895662

3-jet invariant mass
Experiment: D0 (Tevatron Run 2)
Inspire ID: 895662
Status: VALIDATED
Authors:
• Hendrik Hoeth
References:
• arxiv:1104.1986
Beams: p- p+
Beam energies: (980.0, 980.0) GeV
Run details:
• QCD events, three jets above 40 GeV.

Inclusive three-jet differential cross-section as a function of invariant mass of the three jets with the largest transverse momenta. The measurement is made in three rapidity regions ($|y|<0.8, 1.6, 2.4$) and with jets above 40, 70, and 100 GeV.

Source code: D0_2011_I895662.cc
 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FinalState.hh" #include "Rivet/Projections/FastJets.hh" namespace Rivet { class D0_2011_I895662 : public Analysis { public: D0_2011_I895662() : Analysis("D0_2011_I895662") { } public: void init() { FastJets jets(FinalState(-3.6, 3.6, 0.*GeV), FastJets::D0ILCONE, 0.7); jets.useInvisibles(); declare(jets, "Jets"); _h_m3j_08_40 = bookHisto1D(1, 1, 1); _h_m3j_16_40 = bookHisto1D(2, 1, 1); _h_m3j_24_40 = bookHisto1D(3, 1, 1); _h_m3j_24_70 = bookHisto1D(4, 1, 1); _h_m3j_24_100 = bookHisto1D(5, 1, 1); } void analyze(const Event& event) { const double weight = event.weight(); Jets jets = apply(event, "Jets").jetsByPt(40.*GeV); // Need three jets, leading jet above 150 GeV if (jets.size() < 3 || jets[0].pT() <= 150.*GeV) vetoEvent; std::vector p; for (size_t i=0; i<3; i++) { p.push_back(jets[i].momentum()); } // Jets need to be separated by 2*Rcone if (deltaR(p[0], p[1], RAPIDITY) < 1.4 || deltaR(p[0], p[2], RAPIDITY) < 1.4 || deltaR(p[1], p[2], RAPIDITY) < 1.4) vetoEvent; // Leading three jets need to be within |y|<2.4 double ymax = fabs(p[0].rapidity()); for (size_t i=1; i<3; i++) { if (ymax < fabs(p[i].rapidity())) ymax = fabs(p[i].rapidity()); } if (ymax >= 2.4) vetoEvent; double m3jet = (p[0]+p[1]+p[2]).mass()/GeV; if (ymax < 0.8) _h_m3j_08_40->fill(m3jet, weight); if (ymax < 1.6) _h_m3j_16_40->fill(m3jet, weight); if (ymax < 2.4) { _h_m3j_24_40->fill(m3jet, weight); if (p[2].pT() > 70.*GeV) _h_m3j_24_70->fill(m3jet, weight); if (p[2].pT() > 100.*GeV) _h_m3j_24_100->fill(m3jet, weight); } } void finalize() { // Factor of 1000 is based on GeV <-> TeV mismatch between paper and Hepdata table scale(_h_m3j_08_40, 1000*crossSection()/picobarn/sumOfWeights()); scale(_h_m3j_16_40, 1000*crossSection()/picobarn/sumOfWeights()); scale(_h_m3j_24_40, 1000*crossSection()/picobarn/sumOfWeights()); scale(_h_m3j_24_70, 1000*crossSection()/picobarn/sumOfWeights()); scale(_h_m3j_24_100, 1000*crossSection()/picobarn/sumOfWeights()); } private: Histo1DPtr _h_m3j_08_40; Histo1DPtr _h_m3j_16_40; Histo1DPtr _h_m3j_24_40; Histo1DPtr _h_m3j_24_70; Histo1DPtr _h_m3j_24_100; }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(D0_2011_I895662); }