Rivet is hosted by Hepforge, IPPP Durham

## Rivet analyses reference

### E735_1998_S3905616

Charged particle multiplicity in $p\bar{p}$ collisions at $\sqrt{s} = 1.8\;\text{TeV}$
Experiment: E735 (Tevatron)
Inspire ID: 480349
Status: VALIDATED
Authors:
• Holger Schulz
• Andy Buckley
References:
• Phys.Lett.B435:453-457,1998
Beams: p- p+
Beam energies: (900.0, 900.0) GeV
Run details:
• QCD events, diffractive processes need to be switched on in order to fill the low multiplicity regions. The measurement was done in $|\eta| \lesssim 3.25$ and was extrapolated to full phase space. However, the method of extrapolation remains unclear.

A measurement of the charged multiplicity distribution at $\sqrt{s} = 1.8\;\text{TeV}$. The analysis is reproduced to the best of abilities. There is no theory curve in the paper to compare to.

Source code: E735_1998_S3905616.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 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/ChargedFinalState.hh" #include "Rivet/Projections/TriggerCDFRun0Run1.hh" #include "Rivet/Projections/TriggerUA5.hh" namespace Rivet { /// @brief E735 charged multiplicity in NSD-triggered events class E735_1998_S3905616 : public Analysis { public: /// Constructor E735_1998_S3905616() : Analysis("E735_1998_S3905616") { _sumWTrig = 0; } /// @name Analysis methods //@{ void init() { // Projections declare(TriggerUA5(), "Trigger"); declare(ChargedFinalState(), "FS"); // Histo _hist_multiplicity = bookHisto1D(1, 1, 1); } void analyze(const Event& event) { const bool trigger = apply(event, "Trigger").nsdDecision(); if (!trigger) vetoEvent; const double weight = event.weight(); _sumWTrig += weight; const ChargedFinalState& fs = apply(event, "FS"); const size_t numParticles = fs.particles().size(); _hist_multiplicity->fill(numParticles, weight); } void finalize() { scale(_hist_multiplicity, 1/_sumWTrig); } //@} private: /// @name Weight counter //@{ double _sumWTrig; //@} /// @name Histograms //@{ Histo1DPtr _hist_multiplicity; //@} }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(E735_1998_S3905616); }