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[Common] add cpaRZ in RecoDecay.h #16227

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Merged
dsekihat merged 1 commit into from
May 13, 2026
+21 −0
Merged

[Common] add cpaRZ in RecoDecay.h #16227

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21 changes: 21 additions & 0 deletions Common/Core/RecoDecay.h
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Original file line number Diff line number Diff line change
Expand Up @@ -279,6 +279,27 @@ struct RecoDecay {
return cos;
}

/// Calculates cosine of pointing angle in the {r, z} plane.
/// \param posPV {x, y, z} position of the primary vertex
/// \param posSV {x, y, z} position of the secondary vertex
/// \param mom {x, y, z} momentum array
/// \return cosine of pointing angle in {r, z}
template <std::size_t N, typename T, typename U, typename V>
static double cpaRZ(const T& posPV, const U& posSV, const std::array<V, 3>& mom)
{
// CPARZ = (r . pz)/(|r| |pz|)
auto lineDecay = std::array{sqrtSumOfSquares(posSV[0] - posPV[0], posSV[1] - posPV[1]), posSV[2] - posPV[2]};
auto momRZ = std::array{sqrtSumOfSquares(mom[0], mom[1]), mom[2]};
auto cos = dotProd(lineDecay, momRZ) / std::sqrt(mag2(lineDecay) * mag2(momRZ));
if (cos < -1.) {
return -1.;
}
if (cos > 1.) {
return 1.;
}
return cos;
}

/// Calculates proper lifetime times c.
/// \note Promotes numbers to double before squaring to avoid precision loss in float multiplication.
/// \param mom 3-momentum array
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