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[PWGCF] Add differential flow code #14803

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wenyaCern wants to merge 7 commits into from
+45 −1
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[PWGCF] Add differential flow code #14803

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1dadae1
change flow code in femtoDream
wenyaCern Jan 30, 2026
c61d2f2
Please consider the following formatting changes
alibuild Jan 30, 2026
ce1cacb
Merge pull request #14 from alibuild/alibot-cleanup-14708
wenyaCern Jan 30, 2026
ea6244b
Add differential flow histos
wenyaCern Feb 4, 2026
c7840ab
Please consider the following formatting changes
alibuild Feb 4, 2026
e7f4961
Merge pull request #15 from alibuild/alibot-cleanup-14803
wenyaCern Feb 4, 2026
0a8ccda
Merge branch 'master' into flow-change-fd
wenyaCern Feb 4, 2026
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46 changes: 45 additions & 1 deletion PWGCF/FemtoDream/Core/femtoDreamCollisionSelection.h
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Original file line number Diff line number Diff line change
Expand Up @@ -219,7 +219,7 @@ class FemtoDreamCollisionSelection
mHistogramQn = registry;
mHistogramQn->add("Event/centFT0CBeforeQn", "; cent", kTH1F, {{10, 0, 100}});
mHistogramQn->add("Event/centFT0CAfterQn", "; cent", kTH1F, {{10, 0, 100}});
mHistogramQn->add("Event/centVsqn", "; cent; qn", kTH2F, {{10, 0, 100}, {100, 0, 1000}});
mHistogramQn->add("Event/centVsqn", "; cent; qn", kTH2F, {{10, 0, 100}, {200, 0, 500}});
mHistogramQn->add("Event/centVsqnVsSpher", "; cent; qn; Sphericity", kTH3F, {{10, 0, 100}, {100, 0, 1000}, {100, 0, 1}});
mHistogramQn->add("Event/qnBin", "; qnBin; entries", kTH1F, {{20, 0, 20}});
mHistogramQn->add("Event/psiEP", "; #Psi_{EP} (deg); entries", kTH1F, {{100, 0, 180}});
Expand All @@ -241,6 +241,11 @@ class FemtoDreamCollisionSelection
mHistogramQn->get<TH1>(HIST("Event/hN2allQn"))->Sumw2();
mHistogramQn->get<TH1>(HIST("Event/hD2allQn"))->Sumw2();

mHistogramQn->add("Event/hn2pQn", ";centrality; pT; eta; #sum Re(p_{2,A} Q_{2,B}^{*})", kTH3F, {{centBins, 0, 100}, {20, 0.2, 5.0}, {32, -0.8, 0.8}});
mHistogramQn->add("Event/hd2pQn", ";centrality; pT; eta; #sum (w_{A} W_{B})", kTH3F, {{centBins, 0, 100}, {20, 0.2, 5.0}, {32, -0.8, 0.8}});
mHistogramQn->add("Event/hEntries", ";centrality; pT; eta; entries", kTH3F, {{centBins, 0, 100}, {20, 0.2, 5.0}, {32, -0.8, 0.8}});
mHistogramQn->add("Event/hEvtCount", ";centrality; count", kTH1F, {{centBins, 0, 100}});

if (doQnSeparation) {
for (int iqn(0); iqn < mumQnBins; ++iqn) {
hN2.push_back(mHistogramQn->add(("Qn/hN2_" + std::to_string(iqn)).c_str(), ";centrality; #sum Re(Q_{2,A} Q_{2,B}^{*})", kTH1F, {{centBins, 0, 100}}));
Expand Down Expand Up @@ -479,6 +484,45 @@ class FemtoDreamCollisionSelection

mHistogramQn->fill(HIST("Event/hN2allQn"), centrality, N2_evt);
mHistogramQn->fill(HIST("Event/hD2allQn"), centrality, D2_evt);

for (auto const& trk : tracks) {
const double pt = trk.pt();
const double eta = trk.eta();
if (pt < ptMin || pt > ptMax) {
continue;
}

const double w = 1.0; // TODO: NUA/NUE weight if you want
const double phi = trk.phi();
const double c = w * TMath::Cos(harmonic * phi);
const double s = w * TMath::Sin(harmonic * phi);

if (eta > fEtaGap) {
double p2A_re = c;
double p2A_im = s;
double wA = w;

double n2_trk = p2A_re * Q2B_re + p2A_im * Q2B_im;
double d2_trk = wA * WB;

mHistogramQn->fill(HIST("Event/hn2pQn"), centrality, pt, eta, n2_trk);
mHistogramQn->fill(HIST("Event/hd2pQn"), centrality, pt, eta, d2_trk);
mHistogramQn->fill(HIST("Event/hEntries"), centrality, pt, eta);
} else if (eta < -1 * fEtaGap) {
double p2B_re = c;
double p2B_im = s;
double wB = w;

double n2_trk = Q2A_re * p2B_re + Q2A_im * p2B_im;
double d2_trk = WA * wB;

mHistogramQn->fill(HIST("Event/hn2pQn"), centrality, pt, eta, n2_trk);
mHistogramQn->fill(HIST("Event/hd2pQn"), centrality, pt, eta, d2_trk);
mHistogramQn->fill(HIST("Event/hEntries"), centrality, pt, eta);
}
}
mHistogramQn->fill(HIST("Event/hEvtCount"), centrality);

if (doQnSeparation && mQnBin >= 0 && mQnBin < numQnBins) {
std::get<std::shared_ptr<TH1>>(hN2[mQnBin])->Fill(centrality, N2_evt);
std::get<std::shared_ptr<TH1>>(hD2[mQnBin])->Fill(centrality, D2_evt);
Expand Down
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