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Rivet analyses reference
HERA_2015_I1353667
Combined H1/ZEUS $D^*$ production cross-sections in DIS
Experiment: H1/ZEUS (HERA)
Inspire ID: 1353667
Status: UNVALIDATED
Authors:
References:
- JHEP 1509 (2015) 149
- DOI:10.1007/JHEP09(2015)149
- DESY-15-037
- arxiv:1503.06042
- http://www-h1.desy.de/publications/htmlsplit/DESY-15-037.long.poster.html
Beams: p+ e-, p+ e+
Beam energies: (159.0, 159.0) GeV
Run details:
- Inclusive DIS events. $Q^2$ cut must be lower than 1.5 $\text{GeV}^2$.
H1 and ZEUS combined differential cross-sections for inclusive $D^{*\pm}$ production in deep-inelastic $ep$ scattering at HERA. The cross-sections are combined in the common visible phase-space region of photon virtuality $Q^2 > 5 \text{GeV}^2$, electron inelasticity $0.02 < y < 0.7$, and the $D^{*\pm}$ meson's transverse momentum $p_T(D^*) > 1.5 \text{GeV}$ and pseudorapidity $|\eta(D^*)| < 1.5$. The combination procedure takes into account all correlations. Double-differential cross sections $d2\sigma/dQ^2 dy$ are combined with earlier $D^{∗\pm}$ data, extending the kinematic range down to $Q^2 > 1.5 \text{GeV}^2$.
Source code:
HERA_2015_I1353667.cc
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104 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/DISKinematics.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Combined H1/ZEUS D* production cross-sections in DIS
class HERA_2015_I1353667 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(HERA_2015_I1353667);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
// declare(FinalState(Cuts::abseta < 5 && Cuts::pT > 100*MeV), "FS");
// FinalState fs;
declare(DISKinematics(), "Kinematics");
declare(UnstableParticles(), "Dstars");
//Cuts::abspid == PID::DSTARPLUS
// Book histograms
book(_h_pTD, 1, 1, 1);
book(_h_etaD, 2, 1, 1);
book(_h_zD, 3, 1, 1);
book(_h_Q2, 4, 1, 1);
book(_h_y, 5, 1, 1);
book(_h_Q2y, 6, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Determine kinematics, including event orientation
const DISKinematics& kin = apply<DISKinematics>(event, "Kinematics");
const int orientation = kin.orientation();
// Q2 and inelasticity cuts
if (!inRange(kin.Q2(), 1.5*GeV2, 1000*GeV2)) vetoEvent;
if (!inRange(kin.y(), 0.02, 0.7)) vetoEvent;
// D* reconstruction
const Particles unstables = apply<ParticleFinder>(event, "Dstars")
.particles(Cuts::pT > 1.5*GeV && Cuts::abseta < 1.5);
const Particles dstars = filter_select(unstables, [](const Particle& p){ return p.abspid() == PID::DSTARPLUS; });
if (dstars.empty()) vetoEvent;
MSG_DEBUG("#D* = " << dstars.size());
const Particle& dstar = dstars.front();
const double zD = (dstar.E() - orientation*dstar.pz()) / (2*kin.beamLepton().E()*kin.y());
// Single-differential histograms with higher low-Q2 cut
if (kin.Q2() > 5*GeV2) {
_h_pTD->fill(dstar.pT()/GeV);
_h_etaD->fill(orientation*dstar.eta());
_h_zD->fill(zD/GeV);
_h_Q2->fill(kin.Q2()/GeV2);
_h_y->fill(kin.y());
}
// // Double-differential (y,Q2) histograms
// _h_Q2y->fill(kin.Q2()/GeV2, kin.y());
}
/// Normalise histograms etc., after the run
void finalize() {
const double sf = crossSection()/nanobarn/sumOfWeights();
scale(_h_pTD, sf);
scale(_h_etaD, sf);
scale(_h_zD, sf);
scale(_h_Q2, sf);
scale(_h_y, sf);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_pTD, _h_etaD, _h_zD, _h_Q2, _h_y;
Histo2DPtr _h_Q2y;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(HERA_2015_I1353667);
}
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