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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief B -> K l+ l-
class BELLE_2021_I1748231 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2021_I1748231);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::abspid==511 or
Cuts::abspid==521);
declare(ufs, "UFS");
DecayedParticles BB(ufs);
BB.addStable( 443);
BB.addStable(100443);
BB.addStable(PID::K0S);
declare(BB, "BB");
for(unsigned int ix=0;ix<4;++ix)
for(unsigned int iy=0;iy<3;++iy) {
book(_h_br[ix][iy],1,1+ix,1+iy);
book(_h_brB[ix][iy],"TMP/h_br_"+toString(ix)+"_"+toString(iy),refData(1,1+ix,1+iy));
}
for(unsigned int ix=0;ix<2;++ix)
book(_c[ix],"TMP/nB_"+toString(ix+1));
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const map<PdgId,unsigned int> & mode1 = { { 321,1},{ 13,1}, {-13,1}};
static const map<PdgId,unsigned int> & mode1CC = { {-321,1},{ 13,1}, {-13,1}};
static const map<PdgId,unsigned int> & mode2 = { { 310,1},{ 13,1}, {-13,1}};
static const map<PdgId,unsigned int> & mode3 = { { 321,1},{ 11,1}, {-11,1}};
static const map<PdgId,unsigned int> & mode3CC = { {-321,1},{ 11,1}, {-11,1}};
static const map<PdgId,unsigned int> & mode4 = { { 310,1},{ 11,1}, {-11,1}};
DecayedParticles BB = apply<DecayedParticles>(event, "BB");
// loop over particles
for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
if(BB.decaying()[ix].abspid()==521) _c[0]->fill();
else _c[1]->fill();
int imode=0;
if ((BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode1)) ||
(BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode1CC))) imode=0;
else if (BB.modeMatches(ix,3,mode2)) imode=1;
else if ((BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode3)) ||
(BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode3CC))) imode=2;
else if (BB.modeMatches(ix,3,mode4)) imode=3;
else continue;
int il = imode<2 ? 13 : 11;
const Particle & lp = BB.decayProducts()[ix].at(-il)[0];
const Particle & lm = BB.decayProducts()[ix].at( il)[0];
double qq = (lp.momentum()+lm.momentum()).mass2();
for(unsigned int iy=0;iy<3;++iy) {
_h_br[imode][iy]->fill(qq);
_h_brB[imode][iy]->fill(qq);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
// ratio of lifetimes
double rLife = 1.078;
// normalize BR plots
for(unsigned int ix=0;ix<4;++ix) {
for(unsigned int iy=0;iy<3;++iy) {
if(ix%2==0) {
scale(_h_br [ix][iy],1e7/ *_c[0]);
scale(_h_brB[ix][iy],1e7/ *_c[0]);
}
else {
scale(_h_br [ix][iy],1e7 / *_c[1]);
// KL0 modes 2x needed for isospin stuff
scale(_h_brB[ix][iy],2e7*rLife/ *_c[1]);
}
}
}
// RK and asymmetry plots
for(unsigned int ix=0;ix<3;++ix) {
Scatter2DPtr RK;
book(RK,3,1,1+ix);
divide(_h_brB[0][ix],_h_brB[2][ix],RK);
book(RK,3,2,1+ix);
divide(_h_brB[1][ix],_h_brB[3][ix],RK);
book(RK,3,3,1+ix);
for(unsigned int ibin=0;ibin<_h_brB[1][ix]->bins().size();++ibin) {
double num = _h_brB[0][ix]->bins()[ibin].height() +_h_brB[1][ix]->bins()[ibin].height();
double numErr2 = sqr(_h_brB[0][ix]->bins()[ibin].heightErr())+sqr(_h_brB[1][ix]->bins()[ibin].heightErr());
double den = _h_brB[2][ix]->bins()[ibin].height() +_h_brB[3][ix]->bins()[ibin].height();
double denErr2 = sqr(_h_brB[2][ix]->bins()[ibin].heightErr())+sqr(_h_brB[3][ix]->bins()[ibin].heightErr());
double val(0.),err(0.);
if(num>0. && den>0.) {
val = num/den;
err = val*(numErr2/sqr(num)+denErr2/sqr(den));
}
double dx = 0.5*_h_brB[0][ix]->bins()[ibin].xWidth();
RK->addPoint(_h_brB[0][ix]->bins()[ibin].xMid(),val,
make_pair(dx,dx),make_pair(err,err));
}
book(RK,2,1,1+ix);
asymm(_h_brB[1][ix],_h_brB[0][ix],RK);
book(RK,2,2,1+ix);
asymm(_h_brB[3][ix],_h_brB[2][ix],RK);
// average plot
book(RK,2,3,1+ix);
for(unsigned int ibin=0;ibin<_h_brB[1][ix]->bins().size();++ibin) {
double term0 = _h_brB[1][ix]->bins()[ibin].height() +_h_brB[3][ix]->bins()[ibin].height();
double term0Err2 = sqr(_h_brB[1][ix]->bins()[ibin].heightErr())+sqr(_h_brB[3][ix]->bins()[ibin].heightErr());
double term1 = _h_brB[0][ix]->bins()[ibin].height() +_h_brB[2][ix]->bins()[ibin].height();
double term1Err2 = sqr(_h_brB[0][ix]->bins()[ibin].heightErr())+sqr(_h_brB[2][ix]->bins()[ibin].heightErr());
double val(0.),err(0.);
if(term0>0. && term1>0.) {
val = (term0-term1)/(term0+term1);
err = 4.*(sqr(term1)*term0Err2 + sqr(term0)*term1Err2)/pow(term0+term1,4);
}
double dx = 0.5*_h_brB[0][ix]->bins()[ibin].xWidth();
RK->addPoint(_h_brB[0][ix]->bins()[ibin].xMid(),val,
make_pair(dx,dx),make_pair(err,err));
}
}
}
/// @}
/// @name Histograms
/// @{
CounterPtr _c[2];
Histo1DPtr _h_br[4][3],_h_brB[4][3];
/// @}
};
RIVET_DECLARE_PLUGIN(BELLE_2021_I1748231);
}
|