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marcovanleeuwenmarcovanleeuwen
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Forward tracking parametrisation based on inter/extrapolation; geometry v1.2
1 parent 79971c0 commit d32b13d

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+129
-10
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2 files changed

+129
-10
lines changed

‎src/lutWrite.cc‎

Lines changed: 69 additions & 10 deletions
Original file line numberDiff line numberDiff line change
@@ -6,6 +6,7 @@
66

77
DetectorK fat;
88
void diagonalise(lutEntry_t &lutEntry);
9+
static float etaMaxBarrel = 1.75;
910

1011
bool
1112
fatSolve(float *eff, float *covm, float pt = 0.1, float eta = 0.0, float mass = 0.13957000, int layer = 0, int what = 0, int efftype = 0, int q = 1)
@@ -48,8 +49,59 @@ fwdSolve(float *covm, float pt = 0.1, float eta = 0.0, float mass = 0.13957000)
4849
return true;
4950
}
5051

52+
bool
53+
fwdPara(float *covm, float pt = 0.1, float eta = 0.0, float mass = 0.13957000, float Bfield = 0.5, int layer = 0, int what = 0)
54+
{
55+
// parametrised forward response; interpolates between FAT at eta = 1.75 and a fixed parametrisation at eta = 4; only diagonal elements
56+
float eff = 0;
57+
float covmbarrel[15] = {0};
58+
if (fabs(eta) < etaMaxBarrel || fabs(eta) > 4)
59+
return false;
60+
61+
if (!fatSolve(&eff, covmbarrel, pt, etaMaxBarrel, mass, layer, what)) return false;
62+
63+
// parametrisation at eta = 4
64+
double beta = 1./sqrt(1+mass*mass/pt/pt/cosh(eta)/cosh(eta));
65+
float dca_pos = 2.5e-4/sqrt(3); // 2.5 micron/sqrt(3)
66+
float r0 = 0.5; // layer 0 radius [cm]
67+
float r1 = 1.3;
68+
float r2 = 2.5;
69+
float x0layer = 0.001; // material budget (rad length) per layer
70+
double sigma_alpha = 0.0136/beta/pt*sqrt(x0layer*cosh(eta))*(1+0.038*log(x0layer*cosh(eta)));
71+
double dcaxy_ms = sigma_alpha*r0*sqrt(1+r1*r1/(r2-r0)/(r2-r0));
72+
double dcaxy2 = dca_pos*dca_pos+dcaxy_ms*dcaxy_ms;
73+
74+
double dcaz_ms = sigma_alpha*r0*cosh(eta);
75+
double dcaz2 = dca_pos*dca_pos+dcaz_ms*dcaz_ms;
76+
77+
float Leta = 2.8/sinh(eta)-0.01*r0; // m
78+
double relmomres_pos = 10e-6*pt/0.3/Bfield/Leta/Leta*sqrt(720./15.);
79+
80+
float relmomres_barrel = sqrt(covmbarrel[14])*pt;
81+
float Router = 1; // m
82+
float relmomres_pos_barrel = 10e-6*pt/0.3/Bfield/Router/Router/sqrt(720./15.);
83+
float relmomres_MS_barrel = sqrt(relmomres_barrel*relmomres_barrel-relmomres_pos_barrel*relmomres_pos_barrel);
84+
85+
// interpolate MS contrib (rel resolution 0.4 at eta = 4)
86+
float relmomres_MS = 1./beta*0.4*pow(0.4/(beta*relmomres_MS_barrel),(fabs(eta)-4.)/(4.-etaMaxBarrel));
87+
float momres_tot = pt*sqrt(relmomres_pos*relmomres_pos + relmomres_MS*relmomres_MS); // total absolute mom reso
88+
89+
// Fill cov matrix diag
90+
for (int i = 0; i < 15; ++i)
91+
covm[i] = 0;
92+
93+
covm[0] = covmbarrel[0];
94+
if (dcaxy2 > covm[0]) covm[0] = dcaxy2;
95+
covm[2] = covmbarrel[2];
96+
if (dcaz2 > covm[2]) covm[2] = dcaz2;
97+
covm[5] = covmbarrel[5]; // sigma^2 sin(phi)
98+
covm[9] = covmbarrel[9]; // sigma^2 tanl
99+
covm[14] = momres_tot*momres_tot/pt/pt/pt/pt; // sigma^2 1/pt
100+
return true;
101+
}
102+
51103
void
52-
lutWrite(const char *filename = "lutCovm.dat", int pdg = 211, float field = 0.2, int layer = 0, int what = 0, int efftype = 0)
104+
lutWrite(const char *filename = "lutCovm.dat", int pdg = 211, float field = 0.2, int layer = 0, int what = 0, int efftype = 0, int usePara = 0)
53105
{
54106

55107
// output file
@@ -78,9 +130,9 @@ lutWrite(const char *filename = "lutCovm.dat", int pdg = 211, float field = 0.2,
78130
lutHeader.radmap.max = 100.;
79131
// eta
80132
lutHeader.etamap.log = false;
81-
lutHeader.etamap.nbins = 40;
82-
lutHeader.etamap.min = -2.;
83-
lutHeader.etamap.max = 2.;
133+
lutHeader.etamap.nbins = 80;
134+
lutHeader.etamap.min = -4.;
135+
lutHeader.etamap.max = 4.;
84136
// pt
85137
lutHeader.ptmap.log = true;
86138
lutHeader.ptmap.nbins = 200;
@@ -108,7 +160,7 @@ lutWrite(const char *filename = "lutCovm.dat", int pdg = 211, float field = 0.2,
108160
for (int ipt = 0; ipt < npt; ++ipt) {
109161
lutEntry.pt = lutHeader.ptmap.eval(ipt);
110162
lutEntry.valid = true;
111-
if (fabs(eta) < 2.) {
163+
if (fabs(eta) <= etaMaxBarrel) { // full lever arm ends at etaMaxBarrel
112164
// printf(" --- fatSolve: pt = %f, eta = %f, mass = %f, field=%f \n", lutEntry.pt, lutEntry.eta, lutHeader.mass, lutHeader.field);
113165
if (!fatSolve(&lutEntry.eff, lutEntry.covm, lutEntry.pt, lutEntry.eta, lutHeader.mass, layer, what, efftype, q)) {
114166
// printf(" --- fatSolve: error \n");
@@ -120,11 +172,18 @@ lutWrite(const char *filename = "lutCovm.dat", int pdg = 211, float field = 0.2,
120172
else {
121173
// printf(" --- fwdSolve: pt = %f, eta = %f, mass = %f, field=%f \n", lutEntry.pt, lutEntry.eta, lutHeader.mass, lutHeader.field);
122174
lutEntry.eff = 1.;
123-
if (!fwdSolve(lutEntry.covm, lutEntry.pt, lutEntry.eta, lutHeader.mass)) {
124-
// printf(" --- fwdSolve: error \n");
125-
lutEntry.valid = false;
126-
for (int i = 0; i < 15; ++i)
127-
lutEntry.covm[i] = 0.;
175+
bool retval = true;
176+
if (usePara) {
177+
retval = fwdPara(lutEntry.covm, lutEntry.pt, lutEntry.eta, lutHeader.mass, field, layer, what);
178+
}
179+
else {
180+
retval = fwdSolve(lutEntry.covm, lutEntry.pt, lutEntry.eta, lutHeader.mass);
181+
}
182+
if ( !retval) {
183+
// printf(" --- fwdSolve: error \n");
184+
lutEntry.valid = false;
185+
for (int i = 0; i < 15; ++i)
186+
lutEntry.covm[i] = 0.;
128187
}
129188
}
130189
diagonalise(lutEntry);

‎src/lutWrite.v12.cc‎

Lines changed: 60 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -0,0 +1,60 @@
1+
/// @author: Roberto Preghenella
2+
/// @email: [email protected]
3+
4+
#include "lutWrite.cc"
5+
6+
float scale = 1.;
7+
8+
void
9+
fatInit_v12(float field = 0.5, float rmin = 100.)
10+
{
11+
fat.SetBField(field);
12+
// new ideal Pixel properties?
13+
Double_t x0IB = 0.001;
14+
Double_t x0OB = 0.01;
15+
Double_t xrhoIB = 2.3292e-02; // 100 mum Si
16+
Double_t xrhoOB = 2.3292e-01; // 1000 mum Si
17+
18+
Double_t resRPhiIB = 0.00025;
19+
Double_t resZIB = 0.00025;
20+
Double_t resRPhiOB = 0.00100;
21+
Double_t resZOB = 0.00100;
22+
Double_t eff = 0.98;
23+
fat.AddLayer((char*)"vertex", 0.0, 0, 0); // dummy vertex for matrix calculation
24+
fat.AddLayer((char*)"bpipe0", 0.48 * scale, 0.00042, 2.772e-02); // 150 mum Be
25+
//
26+
fat.AddLayer((char*)"B00", 0.50 * scale, x0IB, xrhoIB, resRPhiIB, resZIB, eff);
27+
fat.AddLayer((char*)"B01", 1.20 * scale, x0IB, xrhoIB, resRPhiIB, resZIB, eff);
28+
fat.AddLayer((char*)"B02", 2.50 * scale, x0IB, xrhoIB, resRPhiIB, resZIB, eff);
29+
//
30+
fat.AddLayer((char*)"bpipe1", 3.7 * scale, 0.0014, 9.24e-02); // 500 mum Be
31+
//
32+
fat.AddLayer((char*)"B03", 3.75 * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
33+
fat.AddLayer((char*)"B04", 7.00 * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
34+
fat.AddLayer((char*)"B05", 12.0 * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
35+
fat.AddLayer((char*)"B06", 20.0 * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
36+
fat.AddLayer((char*)"B07", 30.0 * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
37+
fat.AddLayer((char*)"B08", 45.0 * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
38+
fat.AddLayer((char*)"B09", 60.0 * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
39+
fat.AddLayer((char*)"B10", 80.0 * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
40+
fat.AddLayer((char*)"B11", 100. * scale, x0OB, xrhoOB, resRPhiOB, resZOB, eff);
41+
fat.SetAtLeastHits(4);
42+
fat.SetAtLeastCorr(4);
43+
fat.SetAtLeastFake(0);
44+
//
45+
fat.SetMinRadTrack(rmin);
46+
//
47+
fat.PrintLayout();
48+
}
49+
50+
void
51+
lutWrite_v12(const char *filename = "lutCovm.dat", int pdg = 211, float field = 0.5, float rmin = 100.)
52+
{
53+
54+
// init FAT
55+
fatInit_v12(field, rmin);
56+
// write
57+
lutWrite(filename, pdg, field, 0, 0, 0, 1); // last flag: use parametrisation for forward resolution
58+
59+
}
60+

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