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## Rivet analyses reference

### BABAR_2006_I709730

Cross section for $e^+e^-\to$ $3\pi^+3\pi^-$, $2\pi^+2\pi^-2\pi^0$, $2\pi^+2\pi^-K^+K^-$
Experiment: BABAR (PEP-II)
Inspire ID: 709730
Status: VALIDATED
Authors:
• Peter Richardson
References:
• Phys.Rev. D73.052003
Beams: e+ e-
Beam energies: ANY
Run details:
Cross sections for $3\pi^+3\pi^-$, $2\pi^+2\pi^-2\pi^0$ and $2\pi^+2\pi^-K^+K^-$ measured by BaBar using radiative return. Useful to compare hadronization and other non-perturbatuve models at low energies between 1.3 and 4.5 GeV.
  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 96 97 98 99 100 101 102 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FinalState.hh" namespace Rivet { /// @brief Add a short analysis description here class BABAR_2006_I709730 : public Analysis { public: /// Constructor DEFAULT_RIVET_ANALYSIS_CTOR(BABAR_2006_I709730); /// @name Analysis methods //@{ /// Book histograms and initialise projections before the run void init() { // Initialise and register projections declare(FinalState(), "FS"); book(_num3pip3pim, "TMP/num3pip3pim" ); book(_num2pip2pim2pi0, "TMP/num2pip2pim2pi0" ); book(_num2pip2pim2KpKm, "TMP/num2pip2pim2KpKm"); } /// Perform the per-event analysis void analyze(const Event& event) { const FinalState& fs = apply(event, "FS"); map nCount; int ntotal(0); for (const Particle& p : fs.particles()) { nCount[p.pid()] += 1; ++ntotal; } if(ntotal!=6) vetoEvent; if(nCount[-211]==3 && nCount[211]==3) _num3pip3pim->fill(); else if(nCount[-211]==2 && nCount[211]==2 && nCount[111]==2) _num2pip2pim2pi0->fill(); else if(nCount[-211]==2 && nCount[211]==2 && nCount[321]==1 && nCount[-321]==1) _num2pip2pim2KpKm->fill(); } /// Normalise histograms etc., after the run void finalize() { for(unsigned int ix=1; ix<4; ++ix) { double sigma = 0., error = 0.; if(ix==1) { sigma = _num3pip3pim->val(); error = _num3pip3pim->err(); } else if(ix==2) { sigma = _num2pip2pim2pi0->val(); error = _num2pip2pim2pi0->err(); } else if(ix==3) { sigma = _num2pip2pim2KpKm->val(); error = _num2pip2pim2KpKm->err(); } sigma *= crossSection()/ sumOfWeights() /nanobarn; error *= crossSection()/ sumOfWeights() /nanobarn; Scatter2D temphisto(refData(ix, 1, 1)); Scatter2DPtr mult; book(mult, ix, 1, 1); for (size_t b = 0; b < temphisto.numPoints(); b++) { const double x = temphisto.point(b).x(); pair ex = temphisto.point(b).xErrs(); pair ex2 = ex; if(ex2.first ==0.) ex2. first=0.0001; if(ex2.second==0.) ex2.second=0.0001; if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) { mult->addPoint(x, sigma, ex, make_pair(error,error)); } else { mult->addPoint(x, 0., ex, make_pair(0.,.0)); } } } } //@} // just count the number of events of the types we're looking for CounterPtr _num3pip3pim,_num2pip2pim2pi0,_num2pip2pim2KpKm; }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(BABAR_2006_I709730); }