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[DPG] Add ccosThetaStar in D0 derived data creator for calibration studies #15346

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Merged
fgrosa merged 1 commit into from
Mar 11, 2026
+28 −0
Merged

[DPG] Add ccosThetaStar in D0 derived data creator for calibration studies #15346

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4 changes: 4 additions & 0 deletions DPG/Tasks/AOTTrack/D0CalibTables.h
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Original file line number Diff line number Diff line change
Expand Up @@ -444,6 +444,8 @@ DECLARE_SOA_COLUMN(Eta, eta, float); /
DECLARE_SOA_COLUMN(Phi, phi, float); //! D0-candidate phi
DECLARE_SOA_COLUMN(InvMassD0, invMassD0, float); //! invariant mass (D0 hypothesis)
DECLARE_SOA_COLUMN(InvMassD0bar, invMassD0bar, float); //! invariant mass (D0bar hypothesis)
DECLARE_SOA_COLUMN(CosThetaStarD0, cosThetaStarD0, float); //! D0-candidate cost* (Helicity frame, D0 mass hypothesis)
DECLARE_SOA_COLUMN(CosThetaStarD0bar, cosThetaStarD0bar, float); //! D0-candidate cost* (Helicity frame, D0bar mass hypthesis)
DECLARE_SOA_COLUMN(DecLength, decLength, uint8_t); //! compressed decay length
DECLARE_SOA_COLUMN(DecLengthXY, decLengthXY, uint8_t); //! compressed decay length XY
DECLARE_SOA_COLUMN(NormDecLength, normDecLength, uint8_t); //! compressed normalised decay length
Expand Down Expand Up @@ -472,6 +474,8 @@ DECLARE_SOA_TABLE(D0CalibCands, "AOD", "D0CALIBCAND",
hf_calib::Phi,
hf_calib::InvMassD0,
hf_calib::InvMassD0bar,
hf_calib::CosThetaStarD0,
hf_calib::CosThetaStarD0bar,
hf_calib::DecLength,
hf_calib::DecLengthXY,
hf_calib::NormDecLength,
Expand Down
24 changes: 24 additions & 0 deletions DPG/Tasks/AOTTrack/derivedDataCreatorD0Calibration.cxx
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Expand Up @@ -41,6 +41,11 @@
#include <MathUtils/detail/TypeTruncation.h>
#include <ReconstructionDataFormats/DCA.h>

#include <Math/GenVector/Boost.h>
#include <Math/Vector3D.h> // IWYU pragma: keep (do not replace with Math/Vector3Dfwd.h)
#include <Math/Vector3Dfwd.h>
#include <Math/Vector4D.h> // IWYU pragma: keep (do not replace with Math/Vector4Dfwd.h)
#include <Math/Vector4Dfwd.h>
#include <TH1D.h>
#include <TRandom3.h>

Expand Down Expand Up @@ -412,6 +417,7 @@ struct DerivedDataCreatorD0Calibration {
}

float invMassD0{0.f}, invMassD0bar{0.f};
float cosThetaStarD0{0.f}, cosThetaStarD0bar{0.f};
std::vector<float> bdtScoresD0{0.f, 1.f, 1.f}, bdtScoresD0bar{0.f, 1.f, 1.f}; // always selected a priori
if (massHypo == D0MassHypo::D0 || massHypo == D0MassHypo::D0AndD0Bar) {
invMassD0 = RecoDecay::m(std::array{pVecPos, pVecNeg}, std::array{o2::constants::physics::MassPiPlus, o2::constants::physics::MassKPlus});
Expand All @@ -424,6 +430,14 @@ struct DerivedDataCreatorD0Calibration {
std::vector<float> featuresCandD0 = {dcaPos.getY(), dcaNeg.getY(), chi2PCA, cosPaD0, cosPaXYD0, decLenXYD0, decLenD0, dcaPos.getY() * dcaNeg.getY(), aod::pid_tpc_tof_utils::combineNSigma<false>(trackPos.tpcNSigmaPi(), trackPos.tofNSigmaPi()), aod::pid_tpc_tof_utils::combineNSigma<false>(trackNeg.tpcNSigmaKa(), trackNeg.tofNSigmaKa()), trackPos.tpcNSigmaPi(), trackPos.tpcNSigmaKa(), aod::pid_tpc_tof_utils::combineNSigma<false>(trackPos.tpcNSigmaKa(), trackPos.tofNSigmaKa()), trackNeg.tpcNSigmaPi(), trackNeg.tpcNSigmaKa(), aod::pid_tpc_tof_utils::combineNSigma<false>(trackNeg.tpcNSigmaPi(), trackNeg.tofNSigmaPi())};
if (!mlResponse.isSelectedMl(featuresCandD0, ptD0, bdtScoresD0)) {
massHypo -= D0MassHypo::D0;
} else { // selected, we compute cost*
ROOT::Math::PxPyPzMVector const fourVecPi = ROOT::Math::PxPyPzMVector(pVecPos[0], pVecPos[1], pVecPos[2], o2::constants::physics::MassPiPlus);
ROOT::Math::PxPyPzMVector const fourVecMother = ROOT::Math::PxPyPzMVector(pVecD0[0], pVecD0[1], pVecD0[2], invMassD0);
ROOT::Math::Boost const boost{fourVecMother.BoostToCM()};
ROOT::Math::PxPyPzMVector const fourVecPiCM = boost(fourVecPi);
ROOT::Math::XYZVector const threeVecPiCM = fourVecPiCM.Vect();
ROOT::Math::XYZVector const helicityVec = fourVecMother.Vect();
cosThetaStarD0 = helicityVec.Dot(threeVecPiCM) / std::sqrt(threeVecPiCM.Mag2()) / std::sqrt(helicityVec.Mag2());
}
}
}
Expand All @@ -439,6 +453,14 @@ struct DerivedDataCreatorD0Calibration {
std::vector<float> featuresCandD0bar = {dcaPos.getY(), dcaNeg.getY(), chi2PCA, cosPaD0, cosPaXYD0, decLenXYD0, decLenD0, dcaPos.getY() * dcaNeg.getY(), aod::pid_tpc_tof_utils::combineNSigma<false>(trackNeg.tpcNSigmaPi(), trackNeg.tofNSigmaPi()), aod::pid_tpc_tof_utils::combineNSigma<false>(trackPos.tpcNSigmaKa(), trackPos.tofNSigmaKa()), trackNeg.tpcNSigmaPi(), trackNeg.tpcNSigmaKa(), aod::pid_tpc_tof_utils::combineNSigma<false>(trackNeg.tpcNSigmaKa(), trackNeg.tofNSigmaKa()), trackPos.tpcNSigmaPi(), trackPos.tpcNSigmaKa(), aod::pid_tpc_tof_utils::combineNSigma<false>(trackPos.tpcNSigmaPi(), trackPos.tofNSigmaPi())};
if (!mlResponse.isSelectedMl(featuresCandD0bar, ptD0, bdtScoresD0bar)) {
massHypo -= D0MassHypo::D0Bar;
} else { // selected, we compute cost*
ROOT::Math::PxPyPzMVector const fourVecPi = ROOT::Math::PxPyPzMVector(pVecNeg[0], pVecNeg[1], pVecNeg[2], o2::constants::physics::MassPiPlus);
ROOT::Math::PxPyPzMVector const fourVecMother = ROOT::Math::PxPyPzMVector(pVecD0[0], pVecD0[1], pVecD0[2], invMassD0bar);
ROOT::Math::Boost const boost{fourVecMother.BoostToCM()};
ROOT::Math::PxPyPzMVector const fourVecPiCM = boost(fourVecPi);
ROOT::Math::XYZVector const threeVecPiCM = fourVecPiCM.Vect();
ROOT::Math::XYZVector const helicityVec = fourVecMother.Vect();
cosThetaStarD0bar = helicityVec.Dot(threeVecPiCM) / std::sqrt(threeVecPiCM.Mag2()) / std::sqrt(helicityVec.Mag2());
}
}
}
Expand Down Expand Up @@ -813,6 +835,8 @@ struct DerivedDataCreatorD0Calibration {
phiD0,
invMassD0,
invMassD0bar,
cosThetaStarD0,
cosThetaStarD0bar,
getCompressedDecayLength(decLenD0),
getCompressedDecayLength(decLenXYD0),
getCompressedNormDecayLength(decLenD0 / errorDecayLengthD0),
Expand Down
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