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[PWGLF] To fix the background issue #16536

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Merged
dmallick2 merged 3 commits into from
Jun 5, 2026
+75 −21
Merged

[PWGLF] To fix the background issue #16536

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af00bf6
To fix the background issue
navkumar123 Jun 4, 2026
de2506a
To fix the variable
navkumar123 Jun 4, 2026
e8cb0ee
To fix the unused-variable
navkumar123 Jun 4, 2026
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96 changes: 75 additions & 21 deletions PWGLF/Tasks/Resonances/chargedkstaranalysis.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -116,10 +116,10 @@ struct Chargedkstaranalysis {
Configurable<bool> activateProductionFrame{"activateProductionFrame", false, "Activate the THnSparse with cosThStar w.r.t. production axis"};
Configurable<bool> activateBeamAxisFrame{"activateBeamAxisFrame", false, "Activate the THnSparse with cosThStar w.r.t. beam axis (Gottified jackson frame)"};
Configurable<bool> activateRandomFrame{"activateRandomFrame", false, "Activate the THnSparse with cosThStar w.r.t. random axis"};
Configurable<int> cRotations{"cRotations", 5, "Number of random rotations in the rotational background"};
Configurable<bool> cBoostKShot{"cBoostKShot", true, "Boost the Kshot in Charged Kstar frame of reference"};
Configurable<int> cRotations{"cRotations", 4, "Number of random rotations in the rotational background"};
Configurable<bool> cCosWithKShot{"cCosWithKShot", true, "Measure the angle with Kshort in Charged Kstar frame of reference"};
// Other cuts on Ks
Configurable<int> rotationalCut{"rotationalCut", 10, "Cut value (Rotation angle pi - pi/cut and pi + pi/cut)"};
Configurable<int> rotationalCut{"rotationalCut", 6, "Cut value (Rotation angle pi - pi/cut and pi + pi/cut)"};

// fixed variables
float rapidityMotherData = 0.5;
Expand Down Expand Up @@ -807,7 +807,7 @@ struct Chargedkstaranalysis {
ROOT::Math::PxPyPzMVector fourVecDauCM, daughterRot, motherRot, daughterRotCM;
ROOT::Math::XYZVectorF beam1CM, beam2CM, zAxisCS, yAxisCS, xAxisCS;
ROOT::Math::XYZVectorF v1CM, zaxisHE, yaxisHE, xaxisHE;
ROOT::Math::XYZVector randomVec, beamVec, normalVec;
ROOT::Math::XYZVector randomVec, beamVec, normalVec, normalVecRot, randomVecRot;
float theta2;
// //polarization calculations
// zBeam = ROOT::Math::XYZVector(0.f, 0.f, 1.f); // ẑ: beam direction in lab frame
Expand Down Expand Up @@ -857,13 +857,20 @@ struct Chargedkstaranalysis {
if (doRotation) {
for (int i = 0; i < helicityCfgs.cRotations; i++) {
theta2 = rn->Uniform(o2::constants::math::PI - o2::constants::math::PI / helicityCfgs.rotationalCut, o2::constants::math::PI + o2::constants::math::PI / helicityCfgs.rotationalCut);
if (helicityCfgs.cCosWithKShot) {
daughterRot = ROOT::Math::PxPyPzMVector(daughter2.Px() * std::cos(theta2) - daughter2.Py() * std::sin(theta2), daughter2.Px() * std::sin(theta2) + daughter2.Py() * std::cos(theta2), daughter2.Pz(), daughter2.M());

daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
motherRot = daughterRot + daughter1;
} else {
daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
}
ROOT::Math::Boost boost2{motherRot.BoostToCM()};
daughterRotCM = boost2(daughterRot);
if (helicityCfgs.cCosWithKShot)
daughterRotCM = boost2(daughter1);
else
daughterRotCM = boost2(daughterRot);

auto cosThetaStarHelicityRot = motherRot.Vect().Dot(daughterRotCM.Vect()) / (std::sqrt(daughterRotCM.Vect().Mag2()) * std::sqrt(motherRot.Vect().Mag2()));
auto phiHelicityRot = std::atan2(yaxisHE.Dot(daughterRotCM.Vect().Unit()), xaxisHE.Dot(daughterRotCM.Vect().Unit()));
Expand All @@ -883,9 +890,15 @@ struct Chargedkstaranalysis {
for (int i = 0; i < helicityCfgs.cRotations; i++) {
theta2 = rn->Uniform(o2::constants::math::PI - o2::constants::math::PI / helicityCfgs.rotationalCut, o2::constants::math::PI + o2::constants::math::PI / helicityCfgs.rotationalCut);

daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());
if (helicityCfgs.cCosWithKShot) {
daughterRot = ROOT::Math::PxPyPzMVector(daughter2.Px() * std::cos(theta2) - daughter2.Py() * std::sin(theta2), daughter2.Px() * std::sin(theta2) + daughter2.Py() * std::cos(theta2), daughter2.Pz(), daughter2.M());

motherRot = daughterRot + daughter2;
motherRot = daughterRot + daughter1;
} else {
daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
}

ROOT::Math::Boost boost2{motherRot.BoostToCM()};
daughterRotCM = boost2(daughterRot);
Expand All @@ -910,11 +923,26 @@ struct Chargedkstaranalysis {
if (doRotation) {
for (int i = 0; i < helicityCfgs.cRotations; i++) {
theta2 = rn->Uniform(o2::constants::math::PI - o2::constants::math::PI / helicityCfgs.rotationalCut, o2::constants::math::PI + o2::constants::math::PI / helicityCfgs.rotationalCut);
daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
if (helicityCfgs.cCosWithKShot) {
daughterRot = ROOT::Math::PxPyPzMVector(daughter2.Px() * std::cos(theta2) - daughter2.Py() * std::sin(theta2), daughter2.Px() * std::sin(theta2) + daughter2.Py() * std::cos(theta2), daughter2.Pz(), daughter2.M());

motherRot = daughterRot + daughter1;
} else {
daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
}
ROOT::Math::Boost boost2{motherRot.BoostToCM()};
if (helicityCfgs.cCosWithKShot)
daughterRotCM = boost2(daughter1);
else
daughterRotCM = boost2(daughterRot);

normalVecRot = ROOT::Math::XYZVector(motherRot.Py(), -motherRot.Px(), 0.f);
auto cosThetaProductionRot = normalVecRot.Dot(daughterRotCM.Vect()) / (std::sqrt(daughterRotCM.Vect().Mag2()) * std::sqrt(normalVecRot.Mag2()));
if (std::abs(motherRot.Rapidity()) < helicityCfgs.rapidityMotherData) {
fillKstarHist(true, multiplicity, motherRot, cosThetaProduction);
fillKstarHist(true, multiplicity, motherRot, cosThetaProductionRot);
}
}
}
Expand All @@ -929,9 +957,17 @@ struct Chargedkstaranalysis {
if (doRotation) {
for (int i = 0; i < helicityCfgs.cRotations; i++) {
theta2 = rn->Uniform(o2::constants::math::PI - o2::constants::math::PI / helicityCfgs.rotationalCut, o2::constants::math::PI + o2::constants::math::PI / helicityCfgs.rotationalCut);
daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
if (helicityCfgs.cCosWithKShot) {
daughterRot = ROOT::Math::PxPyPzMVector(daughter2.Px() * std::cos(theta2) - daughter2.Py() * std::sin(theta2), daughter2.Px() * std::sin(theta2) + daughter2.Py() * std::cos(theta2), daughter2.Pz(), daughter2.M());

motherRot = daughterRot + daughter1;
} else {
daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
}

if (std::abs(motherRot.Rapidity()) < helicityCfgs.rapidityMotherData) {
fillKstarHist(true, multiplicity, motherRot, cosThetaStarBeam);
}
Expand All @@ -950,12 +986,30 @@ struct Chargedkstaranalysis {
}
if (doRotation) {
for (int i = 0; i < helicityCfgs.cRotations; i++) {
auto phiRandomRot = gRandom->Uniform(0.f, constants::math::TwoPI);
auto thetaRandomRot = gRandom->Uniform(0.f, constants::math::PI);
randomVecRot = ROOT::Math::XYZVector(std::sin(thetaRandomRot) * std::cos(phiRandomRot), std::sin(thetaRandomRot) * std::sin(phiRandomRot), std::cos(thetaRandomRot));
theta2 = rn->Uniform(o2::constants::math::PI - o2::constants::math::PI / helicityCfgs.rotationalCut, o2::constants::math::PI + o2::constants::math::PI / helicityCfgs.rotationalCut);
daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
if (helicityCfgs.cCosWithKShot) {
daughterRot = ROOT::Math::PxPyPzMVector(daughter2.Px() * std::cos(theta2) - daughter2.Py() * std::sin(theta2), daughter2.Px() * std::sin(theta2) + daughter2.Py() * std::cos(theta2), daughter2.Pz(), daughter2.M());

motherRot = daughterRot + daughter1;
} else {
daughterRot = ROOT::Math::PxPyPzMVector(daughter1.Px() * std::cos(theta2) - daughter1.Py() * std::sin(theta2), daughter1.Px() * std::sin(theta2) + daughter1.Py() * std::cos(theta2), daughter1.Pz(), daughter1.M());

motherRot = daughterRot + daughter2;
}

ROOT::Math::Boost boost2{motherRot.BoostToCM()};
if (helicityCfgs.cCosWithKShot)
daughterRotCM = boost2(daughter1);
else
daughterRotCM = boost2(daughterRot);
auto cosThetaStarRandomRot = randomVecRot.Dot(daughterRotCM.Vect()) / std::sqrt(daughterRotCM.Vect().Mag2());

if (std::abs(motherRot.Rapidity()) < helicityCfgs.rapidityMotherData) {
fillKstarHist(true, multiplicity, motherRot, cosThetaStarRandom);
fillKstarHist(true, multiplicity, motherRot, cosThetaStarRandomRot);
}
}
}
Expand Down Expand Up @@ -1152,7 +1206,7 @@ struct Chargedkstaranalysis {
histos.fill(HIST("QA/after/kstarinvmass"), lResoKstar.M());
}

if (helicityCfgs.cBoostKShot) {
if (helicityCfgs.cCosWithKShot) {
fillInvMass(lResoKstar, collision.centFT0M(), lResoSecondary, lDecayDaughter_bach, IsMix);
} else {
fillInvMass(lResoKstar, collision.centFT0M(), lDecayDaughter_bach, lResoSecondary, IsMix);
Expand Down Expand Up @@ -1361,7 +1415,7 @@ struct Chargedkstaranalysis {
const float lCentrality = iter->second;

histos.fill(HIST("EffKstar/genKstar"), part.pt(), lCentrality);
if (helicityCfgs.cBoostKShot) {
if (helicityCfgs.cCosWithKShot) {
fillInvMass(lResoKstar, lCentrality, lResoSecondary, lDecayDaughter_bach, eventCutCfgs.confIsMix);
} else {
fillInvMass(lResoKstar, lCentrality, lDecayDaughter_bach, lResoSecondary, eventCutCfgs.confIsMix);
Expand Down Expand Up @@ -1453,7 +1507,7 @@ struct Chargedkstaranalysis {
}

histos.fill(HIST("EffKstar/recoKstar"), ptreco, lCentrality);
if (helicityCfgs.cBoostKShot) {
if (helicityCfgs.cCosWithKShot) {
fillInvMass(lResoKstar, lCentrality, lResoSecondary, lDecayDaughter_bach, eventCutCfgs.confIsMix);
} else {
fillInvMass(lResoKstar, lCentrality, lDecayDaughter_bach, lResoSecondary, eventCutCfgs.confIsMix);
Expand Down
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