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[PWGLF] Add mixed event combinatorial background (#13052)
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-88
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+143
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‎PWGLF/Tasks/Resonances/f1protoncorrelation.cxx‎

Lines changed: 143 additions & 88 deletions
Original file line numberDiff line numberDiff line change
@@ -82,6 +82,7 @@ struct f1protoncorrelation {
8282
Configurable<int> nRot{"nRot", 4, "Number of rotational bkg"};
8383
// Event Mixing
8484
Configurable<int> nEvtMixing{"nEvtMixing", 10, "Number of events to mix"};
85+
Configurable<int> nEvtMixingBkg{"nEvtMixingBkg", 5, "Number of events to mix for background reconstruction"};
8586
ConfigurableAxis CfgVtxBins{"CfgVtxBins", {10, -10, 10}, "Mixing bins - z-vertex"};
8687
ConfigurableAxis CfgMultBins{"CfgMultBins", {VARIABLE_WIDTH, 0.0, 40.0, 80.0, 500.0}, "Mixing bins - number of contributor"};
8788

@@ -108,10 +109,11 @@ struct f1protoncorrelation {
108109
const AxisSpec thnAxisCharge{configThnAxisCharge, "Charge"};
109110

110111
// register histograms
111-
histos.add("hPhaseSpaceProtonKaonSame", "hPhaseSpaceProtonKaonSame", kTH2F, {{200, -2.0f, 2.0f}, {360, -4.0 * TMath::Pi(), 4.0 * TMath::Pi()}});
112-
histos.add("hPhaseSpaceProtonPionSame", "hPhaseSpaceProtonPionSame", kTH2F, {{200, -2.0f, 2.0f}, {360, -4.0 * TMath::Pi(), 4.0 * TMath::Pi()}});
113-
histos.add("hPhaseSpaceProtonKaonMix", "hPhaseSpaceProtonKaonMix", kTH2F, {{200, -2.0f, 2.0f}, {360, -4.0 * TMath::Pi(), 4.0 * TMath::Pi()}});
114-
histos.add("hPhaseSpaceProtonPionMix", "hPhaseSpaceProtonPionMix", kTH2F, {{200, -2.0f, 2.0f}, {360, -4.0 * TMath::Pi(), 4.0 * TMath::Pi()}});
112+
histos.add("hPhaseSpaceProtonKaonSame", "hPhaseSpaceProtonKaonSame", kTH3F, {{40, -2.0f, 2.0f}, {180, -2.0 * TMath::Pi(), 2.0 * TMath::Pi()}, {100, 0.0, 1.0}});
113+
histos.add("hPhaseSpaceProtonPionSame", "hPhaseSpaceProtonPionSame", kTH3F, {{40, -2.0f, 2.0f}, {180, -2.0 * TMath::Pi(), 2.0 * TMath::Pi()}, {100, 0.0, 1.0}});
114+
histos.add("hPhaseSpaceProtonKaonMix", "hPhaseSpaceProtonKaonMix", kTH3F, {{40, -2.0f, 2.0f}, {180, -2.0 * TMath::Pi(), 2.0 * TMath::Pi()}, {100, 0.0, 1.0}});
115+
histos.add("hPhaseSpaceProtonPionMix", "hPhaseSpaceProtonPionMix", kTH3F, {{40, -2.0f, 2.0f}, {180, -2.0 * TMath::Pi(), 2.0 * TMath::Pi()}, {100, 0.0, 1.0}});
116+
115117
histos.add("hNsigmaProtonTPC", "Nsigma Proton TPC distribution", kTH2F, {{100, -5.0f, 5.0f}, {100, 0.0f, 10.0f}});
116118
histos.add("hNsigmaKaonTPC", "Nsigma Kaon TPC distribution", kTH2F, {{100, -5.0f, 5.0f}, {100, 0.0f, 10.0f}});
117119
histos.add("hNsigmaPionTPC", "Nsigma Pion TPC distribution", kTH2F, {{100, -5.0f, 5.0f}, {100, 0.0f, 10.0f}});
@@ -126,6 +128,9 @@ struct f1protoncorrelation {
126128
histos.add("h2MixEventInvariantMassLike_mass", "Like Sign Invariant mass of f1 mix event", kTHnSparseF, {thnAxisKstar, thnAxisPt, thnAxisInvMass, thnAxisCharge});
127129
histos.add("h2MixEventInvariantMassRot_mass", "Rotational Sign Invariant mass of f1 mix event", kTHnSparseF, {thnAxisKstar, thnAxisPt, thnAxisInvMass, thnAxisCharge});
128130

131+
histos.add("h2MixEventInvariantMassUnlike_mass_SEFP", "Unlike-sign invariant mass of f1 mix event (SE-F1P: π mixed, p same event)", kTHnSparseF, {thnAxisKstar, thnAxisPt, thnAxisInvMass, thnAxisCharge});
132+
histos.add("h2MixEventInvariantMassUnlike_mass_DEFP", "Unlike-sign invariant mass of f1 mix event (DE-F1P: π + p mixed)", kTHnSparseF, {thnAxisKstar, thnAxisPt, thnAxisInvMass, thnAxisCharge});
133+
129134
if (fillSparse) {
130135
histos.add("SEMassUnlike", "SEMassUnlike", HistType::kTHnSparseF, {thnAxisInvMass, thnAxisPt, thnAxisPtProton, thnAxisKstar, thnAxisNsigma, thnAxisCharge});
131136
histos.add("SEMassLike", "SEMassLike", HistType::kTHnSparseF, {thnAxisInvMass, thnAxisPt, thnAxisPtProton, thnAxisKstar, thnAxisNsigma, thnAxisCharge});
@@ -311,8 +316,8 @@ struct f1protoncorrelation {
311316
pionCharge = 1;
312317
kaonCharge = -1;
313318
}
314-
histos.fill(HIST("hPhaseSpaceProtonKaonSame"), Proton.Eta() - Kaon.Eta(), PhiAtSpecificRadiiTPC(Proton, Kaon, protontrack.protonCharge(), kaonCharge, bz, bz)); // Phase Space Proton kaon
315-
histos.fill(HIST("hPhaseSpaceProtonPionSame"), Proton.Eta() - Kaon.Eta(), PhiAtSpecificRadiiTPC(Proton, Pion, protontrack.protonCharge(), pionCharge, bz, bz)); // Phase Space Proton Pion
319+
histos.fill(HIST("hPhaseSpaceProtonKaonSame"), Proton.Eta() - Kaon.Eta(), PhiAtSpecificRadiiTPC(Proton, Kaon, protontrack.protonCharge(), kaonCharge, bz, bz), relative_momentum); // Phase Space Proton kaon
320+
histos.fill(HIST("hPhaseSpaceProtonPionSame"), Proton.Eta() - Kaon.Eta(), PhiAtSpecificRadiiTPC(Proton, Pion, protontrack.protonCharge(), pionCharge, bz, bz), relative_momentum); // Phase Space Proton Pion
316321
histos.fill(HIST("h2SameEventInvariantMassUnlike_mass"), relative_momentum, F1.Pt(), F1.M(), pairCharge); // F1 sign = 1 unlike, F1 sign = -1 like
317322
if (fillSparse) {
318323
histos.fill(HIST("SEMassUnlike"), F1.M(), F1.Pt(), Proton.Pt(), relative_momentum, combinedTPC, pairCharge);
@@ -354,113 +359,163 @@ struct f1protoncorrelation {
354359
BinningType colBinning{{CfgVtxBins, CfgMultBins}, true};
355360
Preslice<aod::F1Tracks> tracksPerCollisionPresliceF1 = aod::f1protondaughter::redF1PEventId;
356361
Preslice<aod::ProtonTracks> tracksPerCollisionPresliceP = aod::f1protondaughter::redF1PEventId;
357-
void processME(aod::RedF1PEvents& collisions, aod::F1Tracks& f1tracks, aod::ProtonTracks& protontracks)
362+
void processME(aod::RedF1PEvents& collisions,
363+
aod::F1Tracks& f1tracks,
364+
aod::ProtonTracks& protontracks)
358365
{
359-
for (auto& [collision1, collision2] : selfCombinations(colBinning, nEvtMixing, -1, collisions, collisions)) {
360-
// LOGF(info, "Mixed event collisions: (%d, %d)", collision1.index(), collision2.index());
361-
if (collision1.index() == collision2.index()) {
366+
for (auto const& [collision1, collision2] :
367+
selfCombinations(colBinning, nEvtMixingBkg, -1, collisions, collisions)) {
368+
if (collision1.index() == collision2.index())
362369
continue;
363-
}
364-
if (f1tracks.size() == 0 || protontracks.size() == 0) {
365-
continue;
366-
}
367-
auto groupF1 = f1tracks.sliceBy(tracksPerCollisionPresliceF1, collision1.globalIndex());
368-
auto groupProton = protontracks.sliceBy(tracksPerCollisionPresliceP, collision2.globalIndex());
369-
// auto groupF1 = f1tracks.sliceByCached(aod::f1protondaughter::redF1PEventId, collision1.globalIndex(), cache);
370-
// auto groupProton = protontracks.sliceByCached(aod::f1protondaughter::redF1PEventId, collision2.globalIndex(), cache);
371-
for (auto& [t1, t2] : soa::combinations(o2::soa::CombinationsFullIndexPolicy(groupF1, groupProton))) {
372-
if (t1.f1MassKaonKshort() > maxKKS0Mass) {
370+
371+
// Preslices
372+
auto f1_c1 = f1tracks.sliceBy(tracksPerCollisionPresliceF1, collision1.globalIndex());
373+
auto f1_c2 = f1tracks.sliceBy(tracksPerCollisionPresliceF1, collision2.globalIndex());
374+
auto p_c1 = protontracks.sliceBy(tracksPerCollisionPresliceP, collision1.globalIndex());
375+
auto p_c2 = protontracks.sliceBy(tracksPerCollisionPresliceP, collision2.globalIndex());
376+
377+
// -------------------------------
378+
// CASE 1: SE-F1P (π mixed from c2, K+K0s from c1, proton from c1)
379+
// -------------------------------
380+
for (auto const& t1 : f1_c1) {
381+
if (t1.f1MassKaonKshort() > maxKKS0Mass)
373382
continue;
374-
}
375-
F1.SetXYZM(t1.f1Px(), t1.f1Py(), t1.f1Pz(), t1.f1Mass());
376-
Pion.SetXYZM(t1.f1d1Px(), t1.f1d1Py(), t1.f1d1Pz(), 0.139);
383+
377384
Kaon.SetXYZM(t1.f1d2Px(), t1.f1d2Py(), t1.f1d2Pz(), 0.493);
378385
Kshort.SetXYZM(t1.f1d3Px(), t1.f1d3Py(), t1.f1d3Pz(), 0.497);
379386
KaonKshortPair = Kaon + Kshort;
380-
if (Pion.Pt() > maxMomentumPion || Kaon.Pt() > maxMomentumKaon) {
387+
388+
if (Kaon.Pt() > maxMomentumKaon)
381389
continue;
382-
}
383390
if (pdepPID) {
384-
if (Kaon.Pt() <= 0.5 && (t1.f1d2TPC() < -2.5 || t1.f1d2TPC() > 2.5)) {
391+
if (Kaon.Pt() <= 0.5 && (t1.f1d2TPC() < -2.5 || t1.f1d2TPC() > 2.5))
385392
continue;
386-
}
387-
if (Kaon.Pt() > 0.5 && Kaon.Pt() <= 0.7 && (t1.f1d2TPC() < -1.5 || t1.f1d2TPC() > 2.5)) {
393+
if (Kaon.Pt() > 0.5 && Kaon.Pt() <= 0.7 && (t1.f1d2TPC() < -1.5 || t1.f1d2TPC() > 2.5))
388394
continue;
389-
}
390-
if (Kaon.Pt() > 0.7 && Kaon.Pt() <= 1.0 && (t1.f1d2TPC() < -1.0 || t1.f1d2TPC() > 2.5)) {
395+
if (Kaon.Pt() > 0.7 && Kaon.Pt() <= 1.0 && (t1.f1d2TPC() < -1.0 || t1.f1d2TPC() > 2.5))
391396
continue;
392-
}
393-
if (Kaon.Pt() > 1.0 && (t1.f1d2TPC() < -2.5 || t1.f1d2TPC() > 2.5)) {
397+
if (Kaon.Pt() > 1.0 && (t1.f1d2TPC() < -2.5 || t1.f1d2TPC() > 2.5))
394398
continue;
395-
}
396-
if (Pion.Pt() < 2.0 && (t1.f1d1TPC() < -2.5 || t1.f1d1TPC() > 2.5)) {
399+
}
400+
if (strategyPIDKaon == 1 &&
401+
Kaon.Pt() > momentumTOFKaonMin && Kaon.Pt() <= momentumTOFKaonMax &&
402+
t1.f1d2TOFHit() != 1)
403+
continue;
404+
405+
for (auto const& t2 : p_c1) { // proton from c1
406+
Proton.SetXYZM(t2.protonPx(), t2.protonPy(), t2.protonPz(), 0.938);
407+
if (Proton.Pt() > momentumProtonMax)
397408
continue;
398-
}
399-
if (Pion.Pt() > 2.0 && (t1.f1d1TPC() < -2.5 || t1.f1d1TPC() > 2.5)) {
409+
if (Proton.P() < momentumTOFProton && TMath::Abs(t2.protonNsigmaTPC()) > 2.5)
410+
continue;
411+
if (Proton.P() >= momentumTOFProton && (t2.protonTOFHit() != 1 || TMath::Abs(t2.protonNsigmaTOF()) > 2.5))
400412
continue;
413+
414+
for (auto const& t3 : f1_c2) { // pion source from c2
415+
Pion.SetXYZM(t3.f1d1Px(), t3.f1d1Py(), t3.f1d1Pz(), 0.139);
416+
if (Pion.Pt() > maxMomentumPion)
417+
continue;
418+
if (pdepPID) {
419+
if (Pion.Pt() < 2.0 && (t3.f1d1TPC() < -2.5 || t3.f1d1TPC() > 2.5))
420+
continue;
421+
if (Pion.Pt() >= 2.0 && (t3.f1d1TPC() < -2.5 || t3.f1d1TPC() > 2.5))
422+
continue;
423+
}
424+
if (strategyPIDPion == 1 &&
425+
Pion.Pt() > momentumTOFPionMin && Pion.Pt() <= momentumTOFPionMax &&
426+
t3.f1d1TOFHit() != 1)
427+
continue;
428+
429+
// Fake f1: π(mixed) + (K+K0s from c1)
430+
F1 = Pion + KaonKshortPair;
431+
432+
// keep only unlike-sign branch
433+
if (t1.f1SignalStat() <= 0)
434+
continue;
435+
436+
int f1Charge = t1.f1SignalStat();
437+
float pairQ = f1Charge * t2.protonCharge();
438+
439+
auto kstar = getkstar(F1, Proton);
440+
441+
histos.fill(HIST("h2MixEventInvariantMassUnlike_mass_SEFP"),
442+
kstar, F1.Pt(), F1.M(), pairQ);
401443
}
402444
}
403-
if (strategyPIDPion == 1 && Pion.Pt() > momentumTOFPionMin && Pion.Pt() <= momentumTOFPionMax && t1.f1d1TOFHit() != 1) {
404-
continue;
405-
}
406-
if (strategyPIDKaon == 1 && Kaon.Pt() > momentumTOFKaonMin && Kaon.Pt() <= momentumTOFKaonMax && t1.f1d2TOFHit() != 1) {
407-
continue;
408-
}
409-
if (typeofCombined == 0) {
410-
combinedTPC = TMath::Sqrt(t1.f1d1TPC() * t1.f1d1TPC() + t1.f1d2TPC() * t1.f1d2TPC());
411-
}
412-
if (typeofCombined == 1) {
413-
combinedTPC = (t1.f1d1TPC() - t1.f1d2TPC()) / (t1.f1d1TPC() + t1.f1d2TPC());
414-
}
415-
Proton.SetXYZM(t2.protonPx(), t2.protonPy(), t2.protonPz(), 0.938);
416-
if (Proton.Pt() > momentumProtonMax) {
445+
}
446+
447+
// -------------------------------
448+
// CASE 2: DE-F1P (π mixed from c2, K+K0s from c1, proton from c2)
449+
// -------------------------------
450+
for (auto const& t1 : f1_c1) {
451+
if (t1.f1MassKaonKshort() > maxKKS0Mass)
417452
continue;
418-
}
419-
if (Proton.P() < momentumTOFProton && TMath::Abs(t2.protonNsigmaTPC()) > 2.5) {
453+
454+
Kaon.SetXYZM(t1.f1d2Px(), t1.f1d2Py(), t1.f1d2Pz(), 0.493);
455+
Kshort.SetXYZM(t1.f1d3Px(), t1.f1d3Py(), t1.f1d3Pz(), 0.497);
456+
KaonKshortPair = Kaon + Kshort;
457+
458+
if (Kaon.Pt() > maxMomentumKaon)
420459
continue;
460+
if (pdepPID) {
461+
if (Kaon.Pt() <= 0.5 && (t1.f1d2TPC() < -2.5 || t1.f1d2TPC() > 2.5))
462+
continue;
463+
if (Kaon.Pt() > 0.5 && Kaon.Pt() <= 0.7 && (t1.f1d2TPC() < -1.5 || t1.f1d2TPC() > 2.5))
464+
continue;
465+
if (Kaon.Pt() > 0.7 && Kaon.Pt() <= 1.0 && (t1.f1d2TPC() < -1.0 || t1.f1d2TPC() > 2.5))
466+
continue;
467+
if (Kaon.Pt() > 1.0 && (t1.f1d2TPC() < -2.5 || t1.f1d2TPC() > 2.5))
468+
continue;
421469
}
422-
if (Proton.P() >= momentumTOFProton && (t2.protonTOFHit() != 1 || TMath::Abs(t2.protonNsigmaTOF()) > 2.5)) {
470+
if (strategyPIDKaon == 1 &&
471+
Kaon.Pt() > momentumTOFKaonMin && Kaon.Pt() <= momentumTOFKaonMax &&
472+
t1.f1d2TOFHit() != 1)
423473
continue;
424-
}
425-
auto relative_momentum = getkstar(F1, Proton);
426-
if (t1.f1SignalStat() > 0) {
427-
histos.fill(HIST("h2MixEventInvariantMassUnlike_mass"), relative_momentum, F1.Pt(), F1.M(), 1.0); // F1 sign = 1 unlike, F1 sign = -1 like
428-
if (fillSparse) {
429-
histos.fill(HIST("MEMassUnlike"), F1.M(), F1.Pt(), Proton.Pt(), relative_momentum, combinedTPC, 1.0);
430-
}
431-
}
432-
if (t1.f1SignalStat() == -1) {
433-
histos.fill(HIST("h2MixEventInvariantMassLike_mass"), relative_momentum, F1.Pt(), F1.M(), 1.0);
434-
if (fillSparse) {
435-
histos.fill(HIST("MEMassLike"), F1.M(), F1.Pt(), Proton.Pt(), relative_momentum, combinedTPC, 1.0);
436-
}
437-
}
438-
if (fillRotation) {
439-
for (int nrotbkg = 0; nrotbkg < nRot; nrotbkg++) {
440-
auto anglestart = 5.0 * TMath::Pi() / 6.0;
441-
auto angleend = 7.0 * TMath::Pi() / 6.0;
442-
auto anglestep = (angleend - anglestart) / (1.0 * (9.0 - 1.0));
443-
auto rotangle = anglestart + nrotbkg * anglestep;
444-
auto rotPionPx = Pion.Px() * std::cos(rotangle) - Pion.Py() * std::sin(rotangle);
445-
auto rotPionPy = Pion.Px() * std::sin(rotangle) + Pion.Py() * std::cos(rotangle);
446-
PionRot.SetXYZM(rotPionPx, rotPionPy, Pion.Pz(), Pion.M());
447-
F1Rot = PionRot + KaonKshortPair;
448-
if (F1Rot.Pt() < 1.0) {
474+
475+
for (auto const& t2 : p_c2) { // proton from c2
476+
Proton.SetXYZM(t2.protonPx(), t2.protonPy(), t2.protonPz(), 0.938);
477+
if (Proton.Pt() > momentumProtonMax)
478+
continue;
479+
if (Proton.P() < momentumTOFProton && TMath::Abs(t2.protonNsigmaTPC()) > 2.5)
480+
continue;
481+
if (Proton.P() >= momentumTOFProton && (t2.protonTOFHit() != 1 || TMath::Abs(t2.protonNsigmaTOF()) > 2.5))
482+
continue;
483+
484+
for (auto const& t3 : f1_c2) { // pion from c2
485+
Pion.SetXYZM(t3.f1d1Px(), t3.f1d1Py(), t3.f1d1Pz(), 0.139);
486+
if (Pion.Pt() > maxMomentumPion)
449487
continue;
488+
if (pdepPID) {
489+
if (Pion.Pt() < 2.0 && (t3.f1d1TPC() < -2.5 || t3.f1d1TPC() > 2.5))
490+
continue;
491+
if (Pion.Pt() >= 2.0 && (t3.f1d1TPC() < -2.5 || t3.f1d1TPC() > 2.5))
492+
continue;
450493
}
451-
auto relative_momentum_rot = getkstar(F1Rot, Proton);
452-
if (t1.f1SignalStat() > 0) {
453-
histos.fill(HIST("h2MixEventInvariantMassRot_mass"), relative_momentum_rot, F1Rot.Pt(), F1Rot.M(), 1.0);
454-
if (fillSparse) {
455-
histos.fill(HIST("MEMassRot"), F1Rot.M(), F1Rot.Pt(), Proton.Pt(), relative_momentum_rot, combinedTPC, 1.0);
456-
}
457-
}
494+
if (strategyPIDPion == 1 &&
495+
Pion.Pt() > momentumTOFPionMin && Pion.Pt() <= momentumTOFPionMax &&
496+
t3.f1d1TOFHit() != 1)
497+
continue;
498+
499+
F1 = Pion + KaonKshortPair;
500+
501+
if (t1.f1SignalStat() <= 0)
502+
continue;
503+
504+
int f1Charge = t1.f1SignalStat();
505+
float pairQ = f1Charge * t2.protonCharge();
506+
507+
auto kstar = getkstar(F1, Proton);
508+
509+
histos.fill(HIST("h2MixEventInvariantMassUnlike_mass_DEFP"),
510+
kstar, F1.Pt(), F1.M(), pairQ);
458511
}
459512
}
460513
}
461514
}
462515
}
463-
PROCESS_SWITCH(f1protoncorrelation, processME, "Process EventMixing for combinatorial background", false);
516+
517+
PROCESS_SWITCH(f1protoncorrelation, processME, "Process EventMixing for combinatorial background (SE-F1P & DE-F1P, minimal)", false);
518+
464519
void processMEOpti(aod::RedF1PEvents& collisions, aod::F1Tracks& f1tracks, aod::ProtonTracks& protontracks)
465520
{
466521
// for (auto const& [collision1, collision2] : combinations(soa::CombinationsBlockFullIndexPolicy(colBinningFemto, nEvtMixing, -1, collisions, collisions))){
@@ -544,8 +599,8 @@ struct f1protoncorrelation {
544599
kaonCharge = -1;
545600
}
546601
histos.fill(HIST("h2MixEventInvariantMassUnlike_mass"), relative_momentum, F1.Pt(), F1.M(), pairCharge); // F1 sign = 1 unlike, F1 sign = -1 like
547-
histos.fill(HIST("hPhaseSpaceProtonKaonMix"), Proton.Eta() - Kaon.Eta(), PhiAtSpecificRadiiTPC(Proton, Kaon, t2.protonCharge(), kaonCharge, bz, bz2)); // Phase Space Proton kaon
548-
histos.fill(HIST("hPhaseSpaceProtonPionMix"), Proton.Eta() - Kaon.Eta(), PhiAtSpecificRadiiTPC(Proton, Pion, t2.protonCharge(), pionCharge, bz, bz2)); // Phase Space Proton Pion
602+
histos.fill(HIST("hPhaseSpaceProtonKaonMix"), Proton.Eta() - Kaon.Eta(), PhiAtSpecificRadiiTPC(Proton, Kaon, t2.protonCharge(), kaonCharge, bz, bz2), relative_momentum); // Phase Space Proton kaon
603+
histos.fill(HIST("hPhaseSpaceProtonPionMix"), Proton.Eta() - Kaon.Eta(), PhiAtSpecificRadiiTPC(Proton, Pion, t2.protonCharge(), pionCharge, bz, bz2), relative_momentum); // Phase Space Proton Pion
549604
if (fillSparse) {
550605
histos.fill(HIST("MEMassUnlike"), F1.M(), F1.Pt(), Proton.Pt(), relative_momentum, combinedTPC, pairCharge);
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}

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