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[PWGCF] multiharmonicCorrelations: Add nested loops for cross check #16889

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vkucera merged 3 commits into from
Jul 1, 2026
+80 −5
Merged

[PWGCF] multiharmonicCorrelations: Add nested loops for cross check #16889

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091c4bd
add nested loops
Jul 1, 2026
99b2b8c
fix for linter
Jul 1, 2026
7c44fb7
fix for linter 2
Jul 1, 2026
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85 changes: 80 additions & 5 deletions PWGCF/MultiparticleCorrelations/Tasks/multiharmonicCorrelations.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,7 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
Configurable<bool> cfInitsim{"cfInitsim", false, "init histograms of sim"};
Configurable<bool> cfUseWeights{"cfUseWeights", true, "use weights"};
Configurable<bool> cfToyModel{"cfToyModel", true, "phi-distribution from toy model"};
Configurable<bool> cfNest{"cfNest", true, "nested loops"};

Configurable<std::vector<float>> cfVertexZ{"cfVertexZ", {-10, 10.}, "vertex z position range: {min, max}[cm], with convention: min <= Vz < max"};
Configurable<std::vector<float>> cfPt{"cfPt", {0.2, 5.0}, "transverse momentum range"};
Expand Down Expand Up @@ -171,6 +172,12 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
TProfile* pfour32_centr = NULL;
TProfile* pfour42_centr = NULL;
TComplex Qvector[maxHarmonic][maxPower];
std::vector<float> vecphi;
std::vector<float> vecwei;
TProfile* nestedLoops[maxHarmonic] = {NULL};
TProfile* pv2_nest = NULL;
TProfile* pv3_nest = NULL;
TProfile* pv4_nest = NULL;
} cor;

struct PhiHist {
Expand Down Expand Up @@ -243,15 +250,15 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
string pathstr = filePath;
const string pathalien = "/alice/cern.ch/";
const string pathccdb = "/alice-ccdb.cern.ch/";
if (pathstr.find(pathalien) == 0) {
if (pathstr.starts_with(pathalien)) {
bFileIsInAliEn = true;
} else if (pathstr.find(pathccdb) == 0) {
} else if (pathstr.starts_with(pathccdb)) {
bFileIsInCCDB = true;
}
LOGF(info, "bFileIsInCCDB= %d", bFileIsInCCDB);

if (bFileIsInAliEn) {
TGrid* alien = TGrid::Connect("alien", gSystem->Getenv("USER"), "", ""); // do not forget to add #include <TGrid.h> to the preamble of your analysis task
const TGrid* alien = TGrid::Connect("alien", gSystem->Getenv("USER"), "", ""); // do not forget to add #include <TGrid.h> to the preamble of your analysis task
if (!alien) {
LOGF(fatal, "\033[1;31m%s at line %d\033[0m", __FUNCTION__, __LINE__);
}
Expand Down Expand Up @@ -401,7 +408,7 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
return four;
} // TComplex Four(Int_t n1, Int_t n2, Int_t n3, Int_t n4)

static double pdf(double* x, double* par)
static double pdf(const double* x, const double* par)
{
double y = 1;
int harm = 6;
Expand All @@ -423,7 +430,16 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
auto it = phih.histMap.find(currentRun);
auto histweight = wh.weightsmap.find(currentRun);
float centr = 0, M = 0., msel = 0.;
TF1* f = new TF1("f", pdf, 0, TMath::TwoPi(), 1);
// TF1* f = new TF1("f", pdf, 0, TMath::TwoPi(), 1);
TF1* f = new TF1("f",
"1 +"
"2 * (0.05) * cos(1 * (x - [0])) +"
"2 * (0.06) * cos(2 * (x - [0])) +"
"2 * (0.07) * cos(3 * (x - [0])) +"
"2 * (0.08) * cos(4 * (x - [0])) +"
"2 * (0.09) * cos(5 * (x - [0])) +"
"2 * (0.10) * cos(6 * (x - [0]))",
0, TMath::TwoPi());
f->SetParameters(0.);

if constexpr (rs == eRec || rs == eRecAndSim) {
Expand Down Expand Up @@ -486,12 +502,24 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to

// before loop over particles
float phi = 0, weight = 1.;
vector<float>().swap(cor.vecphi);
vector<float>().swap(cor.vecwei);
for (int ih = 0; ih < maxHarmonic; ih++) {
for (int ip = 0; ip < maxPower; ip++) {
cor.Qvector[ih][ip] = TComplex(0., 0.);
}
}

/*
for (int ih = 0; ih < maxHarmonic; ih++) {
for (int ip = 0; ip < maxPower; ip++) {
LOGF(info, "Qvector[%d][%d]=%f, ", ih, ip, cor.Qvector[ih][ip].Rho2());
}
LOGF(info, "\n");
}
LOGF(info, "\n\n");
*/

// Main loop over particles:
for (const auto& track : tracks) {

Expand Down Expand Up @@ -527,6 +555,7 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
if (cfToyModel) {
phi = f->GetRandom();
}
cor.vecphi.push_back(phi);
if (it != phih.histMap.end()) {
it->second->Fill(phi);
}
Expand All @@ -541,6 +570,7 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
} else {
weight = 1;
}
cor.vecwei.push_back(weight);

// ... and corresponding MC truth simulated:
// See https://github.com/AliceO2Group/O2Physics/blob/master/Tutorials/src/mcHistograms.cxx
Expand Down Expand Up @@ -570,6 +600,30 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
}
} // end of for (auto track: tracks)
event.fHistMsel[eAfter]->Fill(msel);

if (cfNest) {
float phi1 = 0., phi2 = 0., weight1 = 1., weight2 = 2.;
for (Int_t c = 0; c < maxHarmonic; c++) {
delete cor.nestedLoops[c];
cor.nestedLoops[c] = new TProfile("", "", 1, 0., 1.);
cor.nestedLoops[c]->Sumw2();
}
for (int i1 = 0; i1 < static_cast<int>(cor.vecphi.size()); i1++) { // nested loop of particles
phi1 = cor.vecphi[i1];
weight1 = cor.vecwei[i1];
for (int i2 = 0; i2 < static_cast<int>(cor.vecphi.size()); i2++) {
if (i2 == i1) {
continue;
}
phi2 = cor.vecphi[i2];
weight2 = cor.vecwei[i2];
cor.nestedLoops[0]->Fill(0.5, TMath::Cos(2 * phi1 - 2 * phi2), weight1 * weight2);
cor.nestedLoops[1]->Fill(0.5, TMath::Cos(3 * phi1 - 3 * phi2), weight1 * weight2);
cor.nestedLoops[2]->Fill(0.5, TMath::Cos(4 * phi1 - 4 * phi2), weight1 * weight2);
}
} // end of two nested loop
}

// calculate correlations
float Mmin = 4.;
if (msel < Mmin)
Expand All @@ -593,6 +647,13 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
cor.pfour32_centr->Fill(centr, four32, wFour);
cor.pfour42_centr->Fill(centr, four42, wFour);

if (cfNest) {
cor.pv2_nest->Fill(centr, cor.nestedLoops[0]->GetBinContent(1), wTwo);
cor.pv3_nest->Fill(centr, cor.nestedLoops[1]->GetBinContent(1), wTwo);
cor.pv4_nest->Fill(centr, cor.nestedLoops[2]->GetBinContent(1), wTwo);

LOGF(info, "v22=%f, v22_nest=%f", v22, cor.nestedLoops[0]->GetBinContent(1));
}
} // end of template <eRecSim rs, typename T1, typename T2> void Steer(T1 const& collision, T2 const& tracks)

// *) Initialize and book all objects:
Expand Down Expand Up @@ -827,6 +888,9 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
cor.pv42_centr = new TProfile("pv42", "profile of v_{4}^{2}", 9, quantiles);
cor.pfour32_centr = new TProfile("pfour32", "profile of v_{2}^{2}*v_{3}^{2}", 9, quantiles);
cor.pfour42_centr = new TProfile("pfour42", "profile of v_{2}^{2}*v_{4}^{2}", 9, quantiles);
cor.pv2_nest = new TProfile("pv2_nest", "profile of v_{2} from nest", 9, quantiles);
cor.pv3_nest = new TProfile("pv3_nest", "profile of v_{3} from nest", 9, quantiles);
cor.pv4_nest = new TProfile("pv4_nest", "profile of v_{4} from nest", 9, quantiles);
cor.pv22_centr->GetYaxis()->SetTitle("v_{2}^{2}");
cor.pv32_centr->GetYaxis()->SetTitle("v_{3}^{2}");
cor.pv42_centr->GetYaxis()->SetTitle("v_{4}^{2}");
Expand All @@ -837,11 +901,22 @@ struct MultiharmonicCorrelations { // this name is used in lower-case format to
cor.pfour42_centr->GetYaxis()->SetTitle("v_{2}^{2}v_{4}^{2}");
cor.pfour32_centr->GetXaxis()->SetTitle("centrality");
cor.pfour42_centr->GetXaxis()->SetTitle("centrality");
cor.pv2_nest->GetYaxis()->SetTitle("v_{2}");
cor.pv3_nest->GetYaxis()->SetTitle("v_{3}");
cor.pv4_nest->GetYaxis()->SetTitle("v_{4}");
cor.pv2_nest->GetXaxis()->SetTitle("centrality");
cor.pv3_nest->GetXaxis()->SetTitle("centrality");
cor.pv4_nest->GetXaxis()->SetTitle("centrality");
cor.fCorrelationVariablesList->Add(cor.pv22_centr);
cor.fCorrelationVariablesList->Add(cor.pv32_centr);
cor.fCorrelationVariablesList->Add(cor.pv42_centr);
cor.fCorrelationVariablesList->Add(cor.pfour32_centr);
cor.fCorrelationVariablesList->Add(cor.pfour42_centr);
if (cfNest) {
cor.fCorrelationVariablesList->Add(cor.pv2_nest);
cor.fCorrelationVariablesList->Add(cor.pv3_nest);
cor.fCorrelationVariablesList->Add(cor.pv4_nest);
}

// init of phi hist for different runs
for (const int& run : targetRuns) {
Expand Down
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