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ITS: fix zero field seeding #15138

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ITS: fix zero field seeding #15138

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5 changes: 3 additions & 2 deletions Detectors/ITSMFT/ITS/tracking/GPU/cuda/TrackingKernels.cu
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Original file line number Diff line number Diff line change
Expand Up @@ -143,8 +143,9 @@ GPUdii() o2::track::TrackParCov buildTrackSeed(const Cluster& cluster1,

float snp, q2pt, q2pt2;
if (o2::gpu::CAMath::Abs(bz) < 0.01f) {
const float tgp = o2::gpu::CAMath::ATan2(y3 - y1, x3 - x1);
snp = sign * tgp / o2::gpu::CAMath::Sqrt(1.f + tgp * tgp);
const float dx = x3 - x1;
const float dy = y3 - y1;
snp = sign * dy / o2::gpu::CAMath::Hypot(dx, dy);
q2pt = sign / track::kMostProbablePt;
q2pt2 = 1.f;
} else {
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5 changes: 3 additions & 2 deletions Detectors/ITSMFT/ITS/tracking/src/TrackerTraits.cxx
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Expand Up @@ -1278,8 +1278,9 @@ track::TrackParCov TrackerTraits<nLayers>::buildTrackSeed(const Cluster& cluster

float snp, q2pt, q2pt2;
if (mIsZeroField) {
const float tgp = o2::gpu::CAMath::ATan2(y3 - y1, x3 - x1);
snp = sign * tgp / o2::gpu::CAMath::Sqrt(1.f + tgp * tgp);
const float dx = x3 - x1;
const float dy = y3 - y1;
snp = sign * dy / o2::gpu::CAMath::Hypot(dx, dy);
q2pt = sign / track::kMostProbablePt;
q2pt2 = 1.f;
} else {
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