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[PWGLF] adding pv pointing angle comparison (#14213)
Co-authored-by: ALICE Action Bot <alibuild@cern.ch>
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-15
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‎PWGLF/Tasks/Strangeness/lambdalambda.cxx‎

Lines changed: 54 additions & 15 deletions
Original file line numberDiff line numberDiff line change
@@ -119,15 +119,17 @@ struct lambdalambda {
119119

120120
Configurable<bool> cfgV0V0Sel{"cfgV0V0Sel", false, "application of V0V0 selections"};
121121

122-
Configurable<float> cfgV0V0RadiusMin{"cfgV0V0RadiusMin", 1.0, "maximum radius of v0v0"};
122+
Configurable<float> cfgV0V0RadiusMin{"cfgV0V0RadiusMin", 1.0, "minimum radius of v0v0"};
123123
Configurable<float> cfgV0V0CPAMin{"cfgV0V0CPAMin", 0.6, "minimum CPA of v0v0"};
124124
Configurable<float> cfgV0V0DistanceMin{"cfgV0V0DistanceMin", 1, "minimum distance of v0v0"};
125-
Configurable<float> cfgV0V0DCAMin{"cfgV0V0DCAMin", 1.0, "maximum DCA of v0v0 R"};
125+
Configurable<float> cfgV0V0DCAMin{"cfgV0V0DCAMin", 1.0, "minimum DCA of v0v0 R"};
126+
Configurable<float> cfgV0V0PVPAMin{"cfgV0V0PVPAMin", 0.9, "minimum PV PA of v0v0"};
126127

127128
Configurable<float> cfgV0V0RadiusMax{"cfgV0V0RadiusMax", 1.0, "maximum radius of v0v0"};
128129
Configurable<float> cfgV0V0CPAMax{"cfgV0V0CPAMax", 0.6, "maximum CPA of v0v0"};
129130
Configurable<float> cfgV0V0DistanceMax{"cfgV0V0DistanceMax", 1, "maximum distance of v0v0"};
130131
Configurable<float> cfgV0V0DCAMax{"cfgV0V0DCAMax", 1.0, "maximum DCA of v0v0 R"};
132+
Configurable<float> cfgV0V0PVPAMax{"cfgV0V0PVPAMax", 1.0, "maximum PV PA of v0v0"};
131133

132134
Configurable<bool> cfgEffCor{"cfgEffCor", false, "flag to apply efficiency correction"};
133135
Configurable<std::string> cfgEffCorPath{"cfgEffCorPath", "", "path for pseudo efficiency correction"};
@@ -184,11 +186,13 @@ struct lambdalambda {
184186
histos.add("CPA_V0V0_full", "", {HistType::kTHnSparseF, {massAxis, ptAxis, CPAAxis, combAxis}});
185187
histos.add("Distance_V0V0_full", "", {HistType::kTHnSparseF, {massAxis, ptAxis, DistanceAxis, combAxis}});
186188
histos.add("DCA_V0V0_full", "", {HistType::kTHnSparseF, {massAxis, ptAxis, DCAAxis, combAxis}});
189+
histos.add("PVPA_V0V0_full", "", {HistType::kTHnSparseF, {massAxis, ptAxis, CPAAxis, combAxis}});
187190

188191
histos.add("Radius_V0V0_sel", "", {HistType::kTHnSparseF, {massAxis, ptAxis, RadiusAxis, combAxis}});
189192
histos.add("CPA_V0V0_sel", "", {HistType::kTHnSparseF, {massAxis, ptAxis, CPAAxis, combAxis}});
190193
histos.add("Distance_V0V0_sel", "", {HistType::kTHnSparseF, {massAxis, ptAxis, DistanceAxis, combAxis}});
191194
histos.add("DCA_V0V0_sel", "", {HistType::kTHnSparseF, {massAxis, ptAxis, DCAAxis, combAxis}});
195+
histos.add("PVPA_V0V0_sel", "", {HistType::kTHnSparseF, {massAxis, ptAxis, CPAAxis, combAxis}});
192196

193197
histos.add("h_InvMass_same", "", {HistType::kTHnSparseF, {massAxis, ptAxis, centAxis, combAxis}});
194198
histos.add("h_InvMass_mixed", "", {HistType::kTHnSparseF, {massAxis, ptAxis, centAxis, combAxis}});
@@ -303,8 +307,8 @@ struct lambdalambda {
303307
return true;
304308
}
305309

306-
template <typename V01, typename V02>
307-
bool isSelectedV0V0(V01 const& v01, V02 const& v02)
310+
template <typename V01, typename V02, typename Coll>
311+
bool isSelectedV0V0(V01 const& v01, V02 const& v02, Coll const& coll)
308312
{
309313
if (getDCAofV0V0(v01, v02) > cfgV0V0DCAMax)
310314
return false;
@@ -318,9 +322,13 @@ struct lambdalambda {
318322
return false;
319323
if (getDistance(v01, v02) < cfgV0V0DistanceMin)
320324
return false;
321-
if (getRadius(v01, v02) > cfgV0V0RadiusMax)
325+
if (getRadius(v01, v02, coll) > cfgV0V0RadiusMax)
326+
return false;
327+
if (getRadius(v01, v02, coll) < cfgV0V0RadiusMin)
328+
return false;
329+
if (getPVPA(v01, v02, coll) > cfgV0V0PVPAMax)
322330
return false;
323-
if (getRadius(v01, v02) < cfgV0V0RadiusMin)
331+
if (getPVPA(v01, v02, coll) < cfgV0V0PVPAMin)
324332
return false;
325333

326334
return true;
@@ -360,8 +368,8 @@ struct lambdalambda {
360368
return std::sqrt(posdiff.Mag2());
361369
}
362370

363-
template <typename V01, typename V02>
364-
float getRadius(V01 const& v01, V02 const& v02)
371+
template <typename V01, typename V02, typename Coll>
372+
float getRadius(V01 const& v01, V02 const& v02, Coll const& coll)
365373
{
366374
ROOT::Math::XYZVector v01pos, v02pos, v01mom, v02mom;
367375
v01pos.SetXYZ(v01.x(), v01.y(), v01.z());
@@ -377,7 +385,37 @@ struct lambdalambda {
377385
float s = -posdiff.Dot(v02mom - v01mom.Dot(v02mom) * v01mom) / d;
378386
ROOT::Math::XYZVector dca = v01pos + v02pos + t * v01mom + s * v02mom;
379387
dca /= 2.;
380-
return std::sqrt(dca.Mag2());
388+
ROOT::Math::XYZVector pv;
389+
pv.SetXYZ(coll.posX(), coll.posY(), coll.posZ());
390+
ROOT::Math::XYZVector reldca = dca - pv;
391+
return std::sqrt(reldca.Mag2());
392+
}
393+
394+
template <typename V01, typename V02, typename Coll>
395+
float getPVPA(V01 const& v01, V02 const& v02, Coll const& coll)
396+
{
397+
ROOT::Math::XYZVector v0v0mom;
398+
v0v0mom.SetXYZ(v01.px() + v02.px(), v01.py() + v02.py(), v01.pz() + v02.pz());
399+
400+
ROOT::Math::XYZVector v01pos, v02pos, v01mom, v02mom;
401+
v01pos.SetXYZ(v01.x(), v01.y(), v01.z());
402+
v02pos.SetXYZ(v02.x(), v02.y(), v02.z());
403+
v01mom.SetXYZ(v01.px() / v01.p(), v01.py() / v01.p(), v01.pz() / v01.p());
404+
v02mom.SetXYZ(v02.px() / v02.p(), v02.py() / v02.p(), v02.pz() / v02.p());
405+
ROOT::Math::XYZVector posdiff = v02pos - v01pos;
406+
407+
float d = 1. - TMath::Power(v01mom.Dot(v02mom), 2);
408+
if (d < 1e-5)
409+
return -2;
410+
float t = posdiff.Dot(v01mom - v01mom.Dot(v02mom) * v02mom) / d;
411+
float s = -posdiff.Dot(v02mom - v01mom.Dot(v02mom) * v01mom) / d;
412+
ROOT::Math::XYZVector dca = v01pos + v02pos + t * v01mom + s * v02mom;
413+
dca /= 2.;
414+
ROOT::Math::XYZVector pv;
415+
pv.SetXYZ(coll.posX(), coll.posY(), coll.posZ());
416+
ROOT::Math::XYZVector reldca = dca - pv;
417+
418+
return v0v0mom.Dot(reldca) / sqrt(v0v0mom.Mag2() * reldca.Mag2());
381419
}
382420

383421
template <typename C1, typename C2, typename V01, typename V02>
@@ -465,22 +503,23 @@ struct lambdalambda {
465503
continue;
466504
IsTriggered = true;
467505

468-
histos.fill(HIST("Radius_V0V0_full"), RecoV0V0.M(), RecoV0V0.Pt(), getRadius(v01, v02), V01Tag + V02Tag);
506+
histos.fill(HIST("Radius_V0V0_full"), RecoV0V0.M(), RecoV0V0.Pt(), getRadius(v01, v02, c1), V01Tag + V02Tag);
469507
histos.fill(HIST("CPA_V0V0_full"), RecoV0V0.M(), RecoV0V0.Pt(), getCPA(v01, v02), V01Tag + V02Tag);
470508
histos.fill(HIST("Distance_V0V0_full"), RecoV0V0.M(), RecoV0V0.Pt(), getDistance(v01, v02), V01Tag + V02Tag);
471509
histos.fill(HIST("DCA_V0V0_full"), RecoV0V0.M(), RecoV0V0.Pt(), getDCAofV0V0(v01, v02), V01Tag + V02Tag);
472-
473-
if (isSelectedV0V0(v01, v02)) {
474-
histos.fill(HIST("Radius_V0V0_sel"), RecoV0V0.M(), RecoV0V0.Pt(), getRadius(v01, v02), V01Tag + V02Tag);
510+
histos.fill(HIST("PVPA_V0V0_full"), RecoV0V0.M(), RecoV0V0.Pt(), getPVPA(v01, v02, c1), V01Tag + V02Tag);
511+
if (isSelectedV0V0(v01, v02, c1)) {
512+
histos.fill(HIST("Radius_V0V0_sel"), RecoV0V0.M(), RecoV0V0.Pt(), getRadius(v01, v02, c1), V01Tag + V02Tag);
475513
histos.fill(HIST("CPA_V0V0_sel"), RecoV0V0.M(), RecoV0V0.Pt(), getCPA(v01, v02), V01Tag + V02Tag);
476514
histos.fill(HIST("Distance_V0V0_sel"), RecoV0V0.M(), RecoV0V0.Pt(), getDistance(v01, v02), V01Tag + V02Tag);
477515
histos.fill(HIST("DCA_V0V0_sel"), RecoV0V0.M(), RecoV0V0.Pt(), getDCAofV0V0(v01, v02), V01Tag + V02Tag);
516+
histos.fill(HIST("PVPA_V0V0_sel"), RecoV0V0.M(), RecoV0V0.Pt(), getPVPA(v01, v02, c1), V01Tag + V02Tag);
478517
IsSelected = true;
479518
}
480519

481520
if (doprocessDataSame) {
482521
histos.fill(HIST("h_InvMass_same"), RecoV0V0.M(), RecoV0V0.Pt(), centrality, V01Tag + V02Tag);
483-
if (cfgV0V0Sel && isSelectedV0V0(v01, v02)) {
522+
if (cfgV0V0Sel && isSelectedV0V0(v01, v02, c1)) {
484523
histos.fill(HIST("h_InvMass_same_sel"), RecoV0V0.M(), RecoV0V0.Pt(), centrality, V01Tag + V02Tag);
485524
if (cfgRotBkg) {
486525
for (int nr = 0; nr < cfgNRotBkg; nr++) {
@@ -495,7 +534,7 @@ struct lambdalambda {
495534
}
496535
if (doprocessDataMixed) {
497536
histos.fill(HIST("h_InvMass_mixed"), RecoV0V0.M(), RecoV0V0.Pt(), centrality, V01Tag + V02Tag);
498-
if (cfgV0V0Sel && isSelectedV0V0(v01, v02)) {
537+
if (cfgV0V0Sel && isSelectedV0V0(v01, v02, c1)) {
499538
histos.fill(HIST("h_InvMass_mixed_sel"), RecoV0V0.M(), RecoV0V0.Pt(), centrality, V01Tag + V02Tag);
500539
}
501540
}

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