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[PWGCF] Update femto framework #14612

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Merged
ariedel-cern merged 1 commit into from
Jan 23, 2026
+29 −3
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[PWGCF] Update femto framework #14612

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32 changes: 29 additions & 3 deletions PWGCF/Femto/Core/closePairRejection.h
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Original file line number Diff line number Diff line change
Expand Up @@ -25,10 +25,12 @@
#include "Framework/HistogramSpec.h"

#include <array>
#include <chrono>
#include <cmath>
#include <cstddef>
#include <map>
#include <numeric>
#include <random>
#include <string>
#include <vector>

Expand Down Expand Up @@ -68,6 +70,7 @@ struct ConfCpr : o2::framework::ConfigurableGroup {
o2::framework::Configurable<float> kinematicMax{"kinematicMax", -1.f, "Maximum kstar/Q3 of pair/triplet for plotting (Set to negative value to turn off the cut)"};
o2::framework::ConfigurableAxis binningDeta{"binningDeta", {{250, -0.5, 0.5}}, "deta"};
o2::framework::ConfigurableAxis binningDphistar{"binningDphistar", {{250, -0.5, 0.5}}, "dphi"};
o2::framework::Configurable<int> seed{"seed", -1, "Seed to randomize particle 1 and particle 2. Set to negative value to deactivate. Set to 0 to generate unique seed in time."};
};

constexpr const char PrefixCprTrackTrack[] = "CprTrackTrack";
Expand Down Expand Up @@ -174,6 +177,17 @@ class CloseTrackRejection
mPlotAverage = confCpr.plotAverage.value;
mPlotAllRadii = confCpr.plotAllRadii.value;

if (confCpr.seed.value >= 0) {
uint64_t randomSeed;
mRandomizeTracks = true;
if (confCpr.seed.value == 0) {
randomSeed = static_cast<uint64_t>(std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count());
} else {
randomSeed = static_cast<uint64_t>(confCpr.seed.value);
}
mRng = std::mt19937(randomSeed);
}

// check if we need to apply any cut a plot is requested
mIsActivated = mCutAverage || mCutAnyRadius || mPlotAverage || mPlotAllRadii;

Expand Down Expand Up @@ -210,11 +224,19 @@ class CloseTrackRejection
mDphistar.fill(0.f);
mDphistarMask.fill(false);

mDeta = track1.eta() - track2.eta();
bool swapTracks = false;
if (mRandomizeTracks) {
swapTracks = (mSwapDist(mRng) == 1);
}

auto const& t1 = swapTracks ? track2 : track1;
auto const& t2 = swapTracks ? track1 : track2;

mDeta = t1.eta() - t2.eta();

for (size_t i = 0; i < TpcRadii.size(); i++) {
auto phistar1 = phistar(mMagField, TpcRadii[i], mChargeAbsTrack1 * track1.signedPt(), track1.phi());
auto phistar2 = phistar(mMagField, TpcRadii[i], mChargeAbsTrack2 * track2.signedPt(), track2.phi());
auto phistar1 = phistar(mMagField, TpcRadii[i], mChargeAbsTrack1 * t1.signedPt(), t1.phi());
auto phistar2 = phistar(mMagField, TpcRadii[i], mChargeAbsTrack2 * t2.signedPt(), t2.phi());
if (phistar1 && phistar2) {
mDphistar.at(i) = RecoDecay::constrainAngle(phistar1.value() - phistar2.value(), -o2::constants::math::PI); // constrain angular difference between -pi and pi
mDphistarMask.at(i) = true;
Expand Down Expand Up @@ -342,6 +364,10 @@ class CloseTrackRejection
float mDeta = 0.f;
std::array<float, Nradii> mDphistar = {0.f};
std::array<bool, Nradii> mDphistarMask = {false};

bool mRandomizeTracks = false;
std::mt19937 mRng;
std::uniform_int_distribution<int> mSwapDist{0, 1};
};

template <const char* prefix>
Expand Down
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