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Add pT function for bound track parameters #581

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Oct 30, 2023
Merged

Add pT function for bound track parameters #581

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8 changes: 8 additions & 0 deletions core/include/detray/tracks/bound_track_parameters.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -142,12 +142,20 @@ struct bound_track_parameters {
matrix_operator().element(m_vector, e_bound_qoverp, 0u) = qop;
}

DETRAY_HOST_DEVICE
scalar_type qopT() const { return track_helper().qopT(m_vector); }

DETRAY_HOST_DEVICE
scalar_type p() const { return track_helper().p(m_vector); }

DETRAY_HOST_DEVICE
vector3 mom() const { return track_helper().mom(m_vector); }

DETRAY_HOST_DEVICE
scalar_type pT() const {
return std::abs(1.f / this->qop() * getter::perp(this->dir()));
}

private:
geometry::barcode m_barcode;
vector_type m_vector;
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16 changes: 16 additions & 0 deletions core/include/detray/tracks/detail/track_helper.hpp
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Expand Up @@ -121,6 +121,22 @@ struct track_helper {
return matrix_operator().element(bound_vec, e_bound_qoverp, 0u);
}

DETRAY_HOST_DEVICE
inline scalar_type qopT(const free_vector& free_vec) const {
const auto dir = this->dir(free_vec);
return matrix_operator().element(free_vec, e_free_qoverp, 0u) /
getter::perp(dir);
}

DETRAY_HOST_DEVICE
inline scalar_type qopT(const bound_vector& bound_vec) const {
const scalar_type theta{
matrix_operator().element(bound_vec, e_bound_theta, 0u)};
const scalar_type sinTheta{math_ns::sin(theta)};
return matrix_operator().element(bound_vec, e_bound_qoverp, 0u) /
sinTheta;
}

DETRAY_HOST_DEVICE
inline scalar_type time(const free_vector& free_vec) const {
return matrix_operator().element(free_vec, e_free_time, 0u);
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3 changes: 3 additions & 0 deletions core/include/detray/tracks/free_track_parameters.hpp
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Expand Up @@ -144,6 +144,9 @@ struct free_track_parameters {
matrix_operator().element(m_vector, e_free_qoverp, 0u) = qop;
}

DETRAY_HOST_DEVICE
scalar_type qopT() const { return track_helper().qopT(m_vector); }

DETRAY_HOST_DEVICE
scalar_type p() const { return track_helper().p(m_vector); }

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7 changes: 7 additions & 0 deletions tests/unit_tests/cpu/tools_track.cpp
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Expand Up @@ -53,6 +53,12 @@ GTEST_TEST(detray_tracks, bound_track_parameters) {

bound_track_parameters<transform3> bound_param1(
geometry::barcode{}.set_index(sf_idx1), bound_vec1, bound_cov1);
EXPECT_NEAR(bound_param1.pT(),
1.f /
std::abs(getter::element(bound_vec1, e_bound_qoverp, 0u)) *
std::sin(getter::element(bound_vec1, e_bound_theta, 0u)),
tol);
EXPECT_NEAR(bound_param1.qopT(), -1.f / bound_param1.pT(), tol);

// second track
dindex sf_idx2 = 1u;
Expand Down Expand Up @@ -171,6 +177,7 @@ GTEST_TEST(detray_tracks, free_track_parameters) {
tol);
EXPECT_NEAR(free_param1.pT(),
std::sqrt(std::pow(mom[0], 2.f) + std::pow(mom[1], 2.f)), tol);
EXPECT_NEAR(free_param1.qopT(), charge / free_param1.pT(), tol);
EXPECT_NEAR(free_param1.mom()[0], free_param1.p() * free_param1.dir()[0],
tol);
EXPECT_NEAR(free_param1.mom()[1], free_param1.p() * free_param1.dir()[1],
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