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[PWGCF,/,FemtoUniverse] Adding thetastar calculation #8272

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Merged
prchakra merged 2 commits into from
Nov 3, 2024
Merged

[PWGCF,/,FemtoUniverse] Adding thetastar calculation #8272

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772c8d9
PWGCF / FemtoUniverse: Adding thetasstar calculation
prchakra Nov 2, 2024
99384bb
Fixing clang-format issue
prchakra Nov 2, 2024
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31 changes: 31 additions & 0 deletions PWGCF/FemtoUniverse/Core/FemtoUniverseMath.h
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,37 @@ class FemtoUniverseMath
return 0.5 * trackRelK.P();
}

/// \tparam T type of tracks
/// \param part1 Particle 1
/// \param mass1 Mass of particle 1
/// \param part2 Particle 2
/// \param mass2 Mass of particle 2
template <typename T>
static float getthetastar(const T& part1, const float mass1, const T& part2, const float mass2)
{
const ROOT::Math::PtEtaPhiMVector vecpart1(part1.pt(), part1.eta(), part1.phi(), mass1);
const ROOT::Math::PtEtaPhiMVector vecpart2(part2.pt(), part2.eta(), part2.phi(), mass2);
const ROOT::Math::PtEtaPhiMVector trackSum = vecpart1 + vecpart2;
const ROOT::Math::PtEtaPhiMVector trackDiff = vecpart1 - vecpart2;

const float beta = trackSum.Beta();
const float betax = beta * std::cos(trackSum.Phi()) * std::sin(trackSum.Theta());
const float betay = beta * std::sin(trackSum.Phi()) * std::sin(trackSum.Theta());
const float betaz = beta * std::cos(trackSum.Theta());

ROOT::Math::PxPyPzMVector PartOneCMS(vecpart1);
ROOT::Math::PxPyPzMVector PartTwoCMS(vecpart2);

const ROOT::Math::Boost boostPRF = ROOT::Math::Boost(-betax, -betay, -betaz);
PartOneCMS = boostPRF(PartOneCMS);
PartTwoCMS = boostPRF(PartTwoCMS);

const ROOT::Math::PtEtaPhiMVector PartOneCMSGeo(PartOneCMS);
const ROOT::Math::PtEtaPhiMVector PartTwoCMSGeo(PartTwoCMS);

return (PartOneCMSGeo.Theta() - PartTwoCMSGeo.Theta());
}

/// Compute the qij of a pair of particles
/// \tparam T type of tracks
/// \param vecparti Particle i PxPyPzMVector
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