|
|
Rivet analyses reference
CELLO_1990_I283026
Spectra for strange hadron production at $E_{\text{CMS}}=35$ GeV
Experiment: CELLO (Petra)
Inspire ID: 283026
Status: VALIDATED
Authors:
References:
- Z.Phys. C46 (1990) 397-404, 1990
Beams: e+ e-
Beam energies: (17.5, 17.5) GeV
Run details:
- e+e- to hadrons at 35 GeV
Spectra for $K^0$, $K^{*+}$ and $\Lambda$ production in $e^+e^-$ collisions at a centre-of-mass energy of 35 GeV measured by the CELLO experiment at Petra. The data in HEPData only contains the centroids of the bins, not the bin edges which have therefore been inferred.
Source code:
CELLO_1990_I283026.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
96
97 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief Strange hadrons at 35GeV
class CELLO_1990_I283026 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CELLO_1990_I283026);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(Beam(), "Beams");
declare(ChargedFinalState(), "FS");
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_K0 , 1, 1, 1);
book(_h_Kstar , 2, 1, 1);
book(_h_Lambda, 3, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// First, veto on leptonic events by requiring at least 4 charged FS particles
const FinalState& fs = apply<FinalState>(event, "FS");
const size_t numParticles = fs.particles().size();
// Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
if (numParticles < 2) {
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
MSG_DEBUG("Passed leptonic event cut");
// Get beams and average beam momentum
const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
const double meanBeamMom = ( beams.first.p3().mod() +
beams.second.p3().mod() ) / 2.0;
MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
// Final state of unstable particles to get particle spectra
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles()) {
const int id = p.abspid();
if (id == PID::K0S || id == PID::K0L) {
_h_K0->fill(p.E()/meanBeamMom);
}
else if(abs(id)==323) {
_h_Kstar->fill(p.E()/meanBeamMom);
}
else if(abs(id)==3122) {
_h_Lambda->fill(p.E()/meanBeamMom);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_K0 , 1./sumOfWeights());
scale(_h_Kstar , 1./sumOfWeights());
scale(_h_Lambda, 1./sumOfWeights());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_K0, _h_Kstar, _h_Lambda;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(CELLO_1990_I283026);
}
|
|