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/Projections/ImpactParameterProjection.hh"
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/AliceCommon.hh"
namespace Rivet {
/// Generic analysis looking at various distributions of final state particles
class ALICE_2015_PPBCentrality : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(ALICE_2015_PPBCentrality);
/// Book histograms and initialise projections before the run
void init() {
// One projection for the actual observable, and one for the
// generated impact parameter.
declare(ALICE::V0AMultiplicity(), "V0A");
declare(ImpactParameterProjection(), "IMP");
declare(ALICE::V0AndTrigger(), "Trigger");
// The calibration histogram:
book(_calib, "V0A", 100, 0.0, 500.0);
// The alternative histogram based on impact parameter. Note that
// it MUST be named the same as the histogram for the experimental
// observable with an added _IMP suffix.
book(_impcalib, "V0A_IMP", 400, 0.0, 20.0);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// The alternative centrality based on generated impact
// parameter, assumes that the generator does not describe the
// full final state, and should therefore be filled even if the
// event is not triggered.
_impcalib->fill(apply<SingleValueProjection>(event, "IMP")());
if ( !apply<ALICE::V0AndTrigger>(event, "Trigger")() ) vetoEvent;
_calib->fill(apply<ALICE::V0AMultiplicity>(event, "V0A")());
}
/// Finalize
void finalize() {
_calib->normalize();
_impcalib->normalize();
}
private:
/// The calibration histograms.
Histo1DPtr _calib;
Histo1DPtr _impcalib;
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ALICE_2015_PPBCentrality);
}
|