Rivet analyses

title: LHCF_2012_I1115479

Measurement of forward neutral pion transverse momentum spectra for $\sqrt{s}$ = 7 TeV proton-proton collisions at LHC

Experiment: LHCF (LHC)

Inspire ID: 1115479

Status: VALIDATED

Authors: - Sercan Sen

References: - Phys.Rev. D86 (2012) 092001 - arXiv: 1205.4578

Beams: p+ p+

Beam energies: (3500.0, 3500.0)GeV

Run details: - Inelastic events (ND+SD+DD) at $\sqrt{s}$ = 7 TeV.

The inclusive production rate of neutral pions has been measured by LHCf experiment during $\sqrt{s}=7$ TeV pp collision operation in early 2010. In order to ensure good event reconstruction efficiency, the range of the $\pi^0$ rapidity and $p_\perp$ are limited to $8.9 < y < 11.0$ and $p_\perp < 0.6$ GeV, respectively.

Source code:LHCF_2012_I1115479.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

class LHCF_2012_I1115479 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(LHCF_2012_I1115479);

public:

void init() {
  declare(UnstableParticles(), "UFS");

  book(_g, {8.9, 9., 9.2, 9.4, 9.6, 10., 11.});
  for (auto& b : _g->bins()) {
    book(b, b.index(), 1, 1);
  }
}


void analyze(const Event& event) {
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");

  const double dphi = TWOPI;

  for (const Particle& p : ufs.particles()) {
    if (p.pid() == 111) {
      double pT = p.pT();
      double y = p.rapidity();

      if (pT > 0.6 * GeV) continue;

      const double scaled_weight = 1.0 / (dphi * pT / GeV);
      _g->fill(y, pT / GeV, scaled_weight);
    }
  }
}


void finalize() {
  scale(_g, 1. / sumOfWeights());
  divByGroupWidth(_g);
}

private:

Histo1DGroupPtr _g;

};

RIVET_DECLARE_PLUGIN(LHCF_2012_I1115479);

} ```