Skip to content

[PWGCF] Add event shape and strange tof to femto framework #17372

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
ariedel-cern merged 5 commits into from
Aug 7, 2026
Merged

[PWGCF] Add event shape and strange tof to femto framework #17372

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
5 commits
Select commit Hold shift + click to select a range
b875773
Feat: add event shape table
ariedel-cern Aug 7, 2026
dee284a
Feat: use strangeness TOF for daughter PID
ariedel-cern Aug 7, 2026
98ab2c7
Feat: add Qa for strange TOF
ariedel-cern Aug 7, 2026
fe9ab4c
Please consider the following formatting changes
alibuild Aug 7, 2026
2c97dcd
Merge pull request #28 from alibuild/alibot-cleanup-17372
ariedel-cern Aug 7, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
148 changes: 88 additions & 60 deletions PWGCF/Femto/Core/cascadeBuilder.h
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -132,10 +132,10 @@ enum CascadeSels {
kCascadeTransRadMin, ///< max. transverse radius

// selection for lambda daughter
kLambdaCpaMin, ///< Min. DCA of the lambda daughers at primary vertex
kLambdaDcaDauMax, ///< TPC PID for daughters (Pion/Proton)
kLambdaTransRadMin, ///< Min. number of TPC clusters of daughter
kLambdaDcaToPvMin, ///< Min. DCA to primary vertex of daughter lambda
kLambdaCpaMin, ///< Min. CPA of the lambda
kLambdaDcaDauMax, ///< Max. DCA between the lambda daughters at lambda decay vertex
kLambdaTransRadMin, ///< Min. tranverse radius of the lambda
kLambdaDcaToPvMin, ///< Min. DCA of the lambda to the primary vertex

// selection for bachelor/daugthers
kDauAbsEtaMax, ///< Max. |eta| of daughter tracks
Expand Down Expand Up @@ -181,9 +181,7 @@ const std::unordered_map<CascadeSels, std::string> cascadeSelectionNames = {
{kPosDauTpc, "Positive Daughter TPC PID"},
{kNegDauTpc, "Negative Daughter TPC PID"},
{kPosDauTof, "Positive Daughter TOF PID"},
{kNegDauTof, "Negative Daughter TOF PID"},

{kCascadeSelsMax, "Cascade Selections Max"}};
{kNegDauTof, "Negative Daughter TOF PID"}};

/// enum for all cascade pre-filters (evaluated in checkFilters, before the selection bitmask)
enum CascadeFilters {
Expand Down Expand Up @@ -237,6 +235,17 @@ class CascadeSelection : public baseselection::BaseSelection<float, o2::analysis
{
this->init(config.passThrough.value);

mPtMin = filter.ptMin.value;
mPtMax = filter.ptMax.value;
mEtaMin = filter.etaMin.value;
mEtaMax = filter.etaMax.value;
mPhiMin = filter.phiMin.value;
mPhiMax = filter.phiMax.value;
mLambdaMassMin = filter.massLambdaMin.value;
mLambdaMassMax = filter.massLambdaMax.value;
mRequireTof = config.requireTof.value;
mKeepTracksWithoutTof = config.keepTracksWithoutTof.value;

if constexpr (modes::isEqual(cascadeType, modes::Cascade::kXi)) {
mXiMassLowerLimit = filter.massXiMin.value;
mXiMassUpperLimit = filter.massXiMax.value;
Expand All @@ -256,17 +265,6 @@ class CascadeSelection : public baseselection::BaseSelection<float, o2::analysis
this->addSelection(kBachelorTofKaon, cascadeSelectionNames.at(kBachelorTofKaon), config.bachelorTofKaon.value, limits::kAbsUpperLimit, true, mRequireTof, false);
}

mPtMin = filter.ptMin.value;
mPtMax = filter.ptMax.value;
mEtaMin = filter.etaMin.value;
mEtaMax = filter.etaMax.value;
mPhiMin = filter.phiMin.value;
mPhiMax = filter.phiMax.value;
mLambdaMassMin = filter.massLambdaMin.value;
mLambdaMassMax = filter.massLambdaMax.value;
mRequireTof = config.requireTof.value;
mKeepTracksWithoutTof = config.keepTracksWithoutTof.value;

this->addSelection(kPosDauTpc, cascadeSelectionNames.at(kPosDauTpc), config.posDauTpc.value, limits::kAbsUpperLimit, true, true, false);
this->addSelection(kNegDauTpc, cascadeSelectionNames.at(kNegDauTpc), config.negDauTpc.value, limits::kAbsUpperLimit, true, true, false);
this->addSelection(kPosDauTof, cascadeSelectionNames.at(kPosDauTof), config.posDauTof.value, limits::kAbsUpperLimit, true, mRequireTof, false);
Expand Down Expand Up @@ -324,56 +322,64 @@ class CascadeSelection : public baseselection::BaseSelection<float, o2::analysis
auto negDaughter = cascade.template negTrack_as<T2>();

// daughter selections
std::array<float, 3> etaDaughters = {std::fabs(bachelor.eta()), std::fabs(posDaughter.eta()), std::fabs(negDaughter.eta())};
std::array<float, 3> etaDaughters = {std::fabs(cascade.bacheloreta()), std::fabs(cascade.positiveeta()), std::fabs(cascade.negativeeta())};
this->evaluateObservable(kDauAbsEtaMax, *std::max_element(etaDaughters.begin(), etaDaughters.end()));

std::array<float, 3> dcaDaughters = {std::fabs(bachelor.dcaXY()), std::fabs(posDaughter.dcaXY()), std::fabs(negDaughter.dcaXY())};
std::array<float, 3> dcaDaughters = {std::fabs(cascade.dcabachtopv()), std::fabs(cascade.dcapostopv()), std::fabs(cascade.dcanegtopv())};
this->evaluateObservable(kDauAbsDcaxyMin, *std::min_element(dcaDaughters.begin(), dcaDaughters.end()));

std::array<float, 3> clustersDaughters = {1.f * bachelor.tpcNClsFound(), 1.f * posDaughter.tpcNClsFound(), 1.f * negDaughter.tpcNClsFound()};
this->evaluateObservable(kDauTpcClsMin, *std::min_element(clustersDaughters.begin(), clustersDaughters.end()));

// bachelor pid selection
// check both pion and kaon PID for xi and omega
this->evaluateObservable(kBachelorTpcPion, bachelor.tpcNSigmaPi());
this->evaluateObservable(kBachelorTpcKaon, bachelor.tpcNSigmaKa());
if (bachelor.hasTOF()) {
this->evaluateObservable(kBachelorTofPion, bachelor.tofNSigmaPi());
this->evaluateObservable(kBachelorTofKaon, bachelor.tofNSigmaKa());
} else if (mKeepTracksWithoutTof) {
this->evaluateObservable(kBachelorTofPion, 0);
this->evaluateObservable(kBachelorTofKaon, 0);
}

// depending on the charge, we check lambda or antilambda hypothesis
if (cascade.sign() < 0) {
this->evaluateObservable(kPosDauTpc, posDaughter.tpcNSigmaPr());
this->evaluateObservable(kNegDauTpc, negDaughter.tpcNSigmaPi());
if (posDaughter.hasTOF()) {
this->evaluateObservable(kPosDauTof, posDaughter.tofNSigmaPr());
// pid selections
// TPC nSigma comes from the daughter track, TOF nSigma and the has-TOF flags from the cascade candidate
// if a daughter has no TOF signal, feed 0 so the bit passes any limit (opt-in via keepTracksWithoutTof)
auto evaluatePid = [this](CascadeSels tpcBit, float tpcNSigma,
CascadeSels tofBit, float tofNSigma, bool hasTof) {
this->evaluateObservable(tpcBit, tpcNSigma);
if (hasTof) {
this->evaluateObservable(tofBit, tofNSigma);
} else if (mKeepTracksWithoutTof) {
this->evaluateObservable(kPosDauTof, 0);
this->evaluateObservable(tofBit, 0.f);
}
if (negDaughter.hasTOF()) {
this->evaluateObservable(kNegDauTof, negDaughter.tofNSigmaPi());
} else if (mKeepTracksWithoutTof) {
this->evaluateObservable(kNegDauTof, 0);
}
} else if (cascade.sign() > 0) {
this->evaluateObservable(kPosDauTpc, posDaughter.tpcNSigmaPi());
this->evaluateObservable(kNegDauTpc, negDaughter.tpcNSigmaPr());
if (posDaughter.hasTOF()) {
this->evaluateObservable(kPosDauTof, posDaughter.tofNSigmaPi());
} else if (mKeepTracksWithoutTof) {
this->evaluateObservable(kPosDauTof, 0);
}
if (negDaughter.hasTOF()) {
this->evaluateObservable(kNegDauTof, negDaughter.tofNSigmaPr());
} else if (mKeepTracksWithoutTof) {
this->evaluateObservable(kNegDauTof, 0);
}
} else {
};

const bool bachHasTof = cascade.bachelorHasTOF();
const bool posHasTof = cascade.positiveHasTOF();
const bool negHasTof = cascade.negativeHasTOF();

// bachelor: pion for Xi, kaon for Omega
if constexpr (modes::isEqual(cascadeType, modes::Cascade::kXi)) {
evaluatePid(kBachelorTpcPion, bachelor.tpcNSigmaPi(),
kBachelorTofPion, cascade.tofNSigmaXiPi(), bachHasTof);
} else if constexpr (modes::isEqual(cascadeType, modes::Cascade::kOmega)) {
evaluatePid(kBachelorTpcKaon, bachelor.tpcNSigmaKa(),
kBachelorTofKaon, cascade.tofNSigmaOmKa(), bachHasTof);
}

// v0 daughters: charge of the cascade fixes the Lambda vs. AntiLambda hypothesis
if (cascade.sign() == 0) {
LOG(warn) << "Encountered Cascade candidate with 0 charge";
} else {
// sign < 0: Xi-/Omega- -> Lambda -> p pi- (pos = proton, neg = pion)
// sign > 0: Xi+/Omega+ -> AntiLambda (pos = pion, neg = antiproton)
const bool isMatter = cascade.sign() < 0;

const float tpcPosDau = isMatter ? posDaughter.tpcNSigmaPr() : posDaughter.tpcNSigmaPi();
const float tpcNegDau = isMatter ? negDaughter.tpcNSigmaPi() : negDaughter.tpcNSigmaPr();

float tofPosDau = 0.f;
float tofNegDau = 0.f;
if constexpr (modes::isEqual(cascadeType, modes::Cascade::kXi)) {
tofPosDau = isMatter ? cascade.tofNSigmaXiLaPr() : cascade.tofNSigmaXiLaPi();
tofNegDau = isMatter ? cascade.tofNSigmaXiLaPi() : cascade.tofNSigmaXiLaPr();
} else if constexpr (modes::isEqual(cascadeType, modes::Cascade::kOmega)) {
tofPosDau = isMatter ? cascade.tofNSigmaOmLaPr() : cascade.tofNSigmaOmLaPi();
tofNegDau = isMatter ? cascade.tofNSigmaOmLaPi() : cascade.tofNSigmaOmLaPr();
}

evaluatePid(kPosDauTpc, tpcPosDau, kPosDauTof, tofPosDau, posHasTof);
evaluatePid(kNegDauTpc, tpcNegDau, kNegDauTof, tofNegDau, negHasTof);
}

this->assembleBitmask<SelectionHistName>();
Expand Down Expand Up @@ -657,6 +663,22 @@ class CascadeBuilder
template <typename T1, typename T2, typename T3, typename T4>
void fillCascade(T1& collisionBuilder, T2& cascadeProducts, T3 const& cascade, T4 const& col, int bachelorIndex, int posDaughterIndex, int negDaughterIndex)
{
float strangeTofBachelor = 0.f;
float strangeTofPosDau = 0.f;
float strangeTofNegDau = 0.f;
const bool isMatter = cascade.sign() < 0; // Xi-/Omega- -> Lambda -> p pi- (pos=proton, neg=pion)

if constexpr (modes::isEqual(cascadeType, modes::Cascade::kXi)) {
strangeTofBachelor = cascade.tofNSigmaXiPi();
strangeTofPosDau = isMatter ? cascade.tofNSigmaXiLaPr() : cascade.tofNSigmaXiLaPi();
strangeTofNegDau = isMatter ? cascade.tofNSigmaXiLaPi() : cascade.tofNSigmaXiLaPr();
}
if constexpr (modes::isEqual(cascadeType, modes::Cascade::kOmega)) {
strangeTofBachelor = cascade.tofNSigmaOmKa();
strangeTofPosDau = isMatter ? cascade.tofNSigmaOmLaPr() : cascade.tofNSigmaOmLaPi();
strangeTofNegDau = isMatter ? cascade.tofNSigmaOmLaPi() : cascade.tofNSigmaOmLaPr();
}

if constexpr (modes::isEqual(cascadeType, modes::Cascade::kXi)) {
if (mProduceXis) {
cascadeProducts.producedXis(collisionBuilder.collisionIndex(),
Expand Down Expand Up @@ -691,7 +713,10 @@ class CascadeBuilder
cascade.v0cosPA(col.posX(), col.posY(), col.posZ()),
cascade.dcaV0daughters(),
cascade.v0radius(),
cascade.dcav0topv(col.posX(), col.posY(), col.posZ()));
cascade.dcav0topv(col.posX(), col.posY(), col.posZ()),
strangeTofBachelor,
strangeTofPosDau,
strangeTofNegDau);
}
}
if constexpr (modes::isEqual(cascadeType, modes::Cascade::kOmega)) {
Expand Down Expand Up @@ -728,7 +753,10 @@ class CascadeBuilder
cascade.v0cosPA(col.posX(), col.posY(), col.posZ()),
cascade.dcaV0daughters(),
cascade.v0radius(),
cascade.dcav0topv(col.posX(), col.posY(), col.posZ()));
cascade.dcav0topv(col.posX(), col.posY(), col.posZ()),
strangeTofBachelor,
strangeTofPosDau,
strangeTofNegDau);
}
}
}
Expand Down
Loading
Loading