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Merged
iarsene merged 2 commits into from
Jul 20, 2022
Merged

PWGDQ/Tasks: update on v0selector #1003

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04abf3b
PWGDQ/Tasks/v0selector: add process switch
dsekihat Jun 9, 2022
88af127
PWGDQ/Tasks: update v0selector to get magnetic field from CCDB
dsekihat Jul 16, 2022
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166 changes: 121 additions & 45 deletions PWGDQ/Tasks/v0selector.cxx
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,10 @@
#include "Common/Core/RecoDecay.h"
#include "DetectorsVertexing/DCAFitterN.h"
#include "PWGDQ/DataModel/ReducedInfoTables.h"
#include "DetectorsBase/Propagator.h"
#include "DetectorsBase/GeometryManager.h"
#include "DataFormatsParameters/GRPObject.h"
#include <CCDB/BasicCCDBManager.h>

#include <Math/Vector4D.h>
#include <array>
Expand Down Expand Up @@ -230,7 +234,7 @@ struct v0selector {
};

// Configurables
Configurable<double> d_bz{"d_bz", -5.0, "bz field"};
Configurable<double> d_bz_input{"d_bz", -999, "bz field, -999 is automatic"};
Configurable<double> v0cospa{"v0cospa", 0.998, "V0 CosPA"}; // double -> N.B. dcos(x)/dx = 0 at x=0)
Configurable<float> dcav0dau{"dcav0dau", 0.3, "DCA V0 Daughters"};
Configurable<float> v0Rmin{"v0Rmin", 0.0, "v0Rmin"};
Expand All @@ -239,27 +243,66 @@ struct v0selector {
Configurable<float> dcamax{"dcamax", 1e+10, "dcamax"};
Configurable<int> mincrossedrows{"mincrossedrows", 70, "min crossed rows"};
Configurable<float> maxchi2tpc{"maxchi2tpc", 4.0, "max chi2/NclsTPC"};
int mRunNumber;
float d_bz;
Service<o2::ccdb::BasicCCDBManager> ccdb;

// aod::Collision gives you tracks matched with collision.
// aod::Collisions gives you all tracks.
// void process(aod::Collisions const& collision, FullTracksExt const& tracks, aod::V0s const& V0s)
// void process(FullTracksExt const& tracks, aod::Collisions const& collision, aod::V0s const& V0s)
// void process(FullTracksExt const& tracks, aod::Collisions const&, aod::V0s const& V0s)
void process(aod::Collisions const&, FullTracksExt const& tracks, aod::V0s const& V0s, aod::Cascades const& Cascades)
// void process(FullTracksExt const& tracks, soa::Join<aod::Collisions, aod::EvSels>::iterator const& collision, aod::V0s const& V0s)
void init(InitContext& context)
{
registry.fill(HIST("hEventCounter"), 0.5);
// using namespace analysis::lambdakzerobuilder;
mRunNumber = 0;
d_bz = 0;

ccdb->setURL("http://alice-ccdb.cern.ch");
ccdb->setCaching(true);
ccdb->setLocalObjectValidityChecking();

auto lut = o2::base::MatLayerCylSet::rectifyPtrFromFile(ccdb->get<o2::base::MatLayerCylSet>("GLO/Param/MatLUT"));

if (!o2::base::GeometryManager::isGeometryLoaded()) {
ccdb->get<TGeoManager>("GLO/Config/GeometryAligned");
/* it seems this is needed at this level for the material LUT to work properly */
/* but what happens if the run changes while doing the processing? */
constexpr long run3grp_timestamp = (1619781650000 + 1619781529000) / 2;

o2::parameters::GRPObject* grpo = ccdb->getForTimeStamp<o2::parameters::GRPObject>("GLO/GRP/GRP", run3grp_timestamp);
o2::base::Propagator::initFieldFromGRP(grpo);
o2::base::Propagator::Instance()->setMatLUT(lut);
}
}

float getMagneticField(uint64_t timestamp)
{
// TODO done only once (and not per run). Will be replaced by CCDBConfigurable
static o2::parameters::GRPObject* grpo = nullptr;
if (grpo == nullptr) {
grpo = ccdb->getForTimeStamp<o2::parameters::GRPObject>("GLO/GRP/GRP", timestamp);
if (grpo == nullptr) {
LOGF(fatal, "GRP object not found for timestamp %llu", timestamp);
return 0;
}
LOGF(info, "Retrieved GRP for timestamp %llu with magnetic field of %d kG", timestamp, grpo->getNominalL3Field());
}
float output = grpo->getNominalL3Field();
return output;
}

void CheckAndUpdate(Int_t lRunNumber, uint64_t lTimeStamp)
{
if (lRunNumber != mRunNumber) {
if (d_bz_input < -990) {
// Fetch magnetic field from ccdb for current collision
d_bz = getMagneticField(lTimeStamp);
} else {
d_bz = d_bz_input;
}
mRunNumber = lRunNumber;
}
}

// Define o2 fitter, 2-prong
o2::vertexing::DCAFitterN<2> fitter;
fitter.setBz(d_bz);
fitter.setPropagateToPCA(true);
fitter.setMaxR(200.);
fitter.setMinParamChange(1e-3);
fitter.setMinRelChi2Change(0.9);
fitter.setMaxDZIni(1e9);
fitter.setMaxChi2(1e9);
fitter.setUseAbsDCA(true); // use d_UseAbsDCA once we want to use the weighted DCA
void process(aod::Collisions const&, aod::BCsWithTimestamps const&, FullTracksExt const& tracks, aod::V0s const& V0s, aod::Cascades const& Cascades)
{
registry.fill(HIST("hEventCounter"), 0.5);

std::map<int, uint8_t> pidmap;

Expand Down Expand Up @@ -313,6 +356,18 @@ struct v0selector {
continue;
}
auto const& collision = V0.posTrack_as<FullTracksExt>().collision();
auto bc = collision.bc_as<aod::BCsWithTimestamps>();
CheckAndUpdate(bc.runNumber(), bc.timestamp());
// Define o2 fitter, 2-prong
o2::vertexing::DCAFitterN<2> fitter;
fitter.setBz(d_bz);
fitter.setPropagateToPCA(true);
fitter.setMaxR(200.);
fitter.setMinParamChange(1e-3);
fitter.setMinRelChi2Change(0.9);
fitter.setMaxDZIni(1e9);
fitter.setMaxChi2(1e9);
fitter.setUseAbsDCA(true); // use d_UseAbsDCA once we want to use the weighted DCA

if (V0.collisionId() != collision.globalIndex()) {
continue;
Expand Down Expand Up @@ -428,17 +483,6 @@ struct v0selector {

} // end of V0 loop

// next, cascade, Omega -> LK
o2::vertexing::DCAFitterN<2> fitterCasc;
fitterCasc.setBz(d_bz);
fitterCasc.setPropagateToPCA(true);
fitterCasc.setMaxR(200.);
fitterCasc.setMinParamChange(1e-3);
fitterCasc.setMinRelChi2Change(0.9);
fitterCasc.setMaxDZIni(1e9);
fitterCasc.setMaxChi2(1e9);
fitterCasc.setUseAbsDCA(true);

// cascade loop
for (auto& casc : Cascades) {
registry.fill(HIST("hCascCandidate"), 0.5);
Expand Down Expand Up @@ -468,6 +512,30 @@ struct v0selector {
continue;
}

auto bc = collision.bc_as<aod::BCsWithTimestamps>();
CheckAndUpdate(bc.runNumber(), bc.timestamp());
// Define o2 fitter, 2-prong
o2::vertexing::DCAFitterN<2> fitterV0;
fitterV0.setBz(d_bz);
fitterV0.setPropagateToPCA(true);
fitterV0.setMaxR(200.);
fitterV0.setMinParamChange(1e-3);
fitterV0.setMinRelChi2Change(0.9);
fitterV0.setMaxDZIni(1e9);
fitterV0.setMaxChi2(1e9);
fitterV0.setUseAbsDCA(true); // use d_UseAbsDCA once we want to use the weighted DCA

// next, cascade, Omega -> LK
o2::vertexing::DCAFitterN<2> fitterCasc;
fitterCasc.setBz(d_bz);
fitterCasc.setPropagateToPCA(true);
fitterCasc.setMaxR(200.);
fitterCasc.setMinParamChange(1e-3);
fitterCasc.setMinRelChi2Change(0.9);
fitterCasc.setMaxDZIni(1e9);
fitterCasc.setMaxChi2(1e9);
fitterCasc.setUseAbsDCA(true);

std::array<float, 3> pos = {0.};
std::array<float, 3> pvecpos = {0.};
std::array<float, 3> pvecneg = {0.};
Expand All @@ -485,18 +553,18 @@ struct v0selector {
nTrack = getTrackParCov(casc.v0_as<aod::V0s>().posTrack_as<FullTracksExt>());
}

int nCand = fitter.process(pTrack, nTrack);
int nCand = fitterV0.process(pTrack, nTrack);
if (nCand != 0) {
fitter.propagateTracksToVertex();
fitterV0.propagateTracksToVertex();
} else {
continue;
}
const auto& v0vtx = fitter.getPCACandidate();
const auto& v0vtx = fitterV0.getPCACandidate();
for (int i = 0; i < 3; i++) {
pos[i] = v0vtx[i];
}

auto V0dca = fitter.getChi2AtPCACandidate(); // distance between 2 legs.
auto V0dca = fitterV0.getChi2AtPCACandidate(); // distance between 2 legs.
registry.fill(HIST("hDCAV0Dau_Casc"), V0dca);
// if (V0dca > 1.0) {
// continue;
Expand All @@ -509,16 +577,16 @@ struct v0selector {

// Covariance matrix calculation
const int momInd[6] = {9, 13, 14, 18, 19, 20}; // cov matrix elements for momentum component
fitter.getTrack(0).getPxPyPzGlo(pvecpos);
fitter.getTrack(1).getPxPyPzGlo(pvecneg);
fitter.getTrack(0).getCovXYZPxPyPzGlo(cov0);
fitter.getTrack(1).getCovXYZPxPyPzGlo(cov1);
fitterV0.getTrack(0).getPxPyPzGlo(pvecpos);
fitterV0.getTrack(1).getPxPyPzGlo(pvecneg);
fitterV0.getTrack(0).getCovXYZPxPyPzGlo(cov0);
fitterV0.getTrack(1).getCovXYZPxPyPzGlo(cov1);

for (int i = 0; i < 6; i++) {
int j = momInd[i];
covV0[j] = cov0[j] + cov1[j];
}
auto covVtxV0 = fitter.calcPCACovMatrix();
auto covVtxV0 = fitterV0.calcPCACovMatrix();
covV0[0] = covVtxV0(0, 0);
covV0[1] = covVtxV0(1, 0);
covV0[2] = covVtxV0(1, 1);
Expand Down Expand Up @@ -652,23 +720,23 @@ struct trackPIDQA {
},
};

void process(soa::Join<aod::Collisions, aod::EvSels>::iterator const& collision, soa::Join<FullTracksExt, aod::V0Bits> const& tracks)
void processQA(soa::Join<aod::Collisions, aod::EvSels>::iterator const& collision, soa::Join<FullTracksExt, aod::V0Bits> const& tracks)
{

registry.fill(HIST("hEventCounter"), 1.0); // all
// if (!collision.alias()[kINT7]) {
// return;
//}
// registry.fill(HIST("hEventCounter"), 2.0); //INT7

if (abs(collision.posZ()) > 10.0) {
if (collision.numContrib() < 0.5) {
return;
}
registry.fill(HIST("hEventCounter"), 3.0); //|Zvtx| < 10 cm
if (collision.numContrib() < 0.5) {
registry.fill(HIST("hEventCounter"), 3.0); // Ncontrib > 0

if (abs(collision.posZ()) > 10.0) {
return;
}
registry.fill(HIST("hEventCounter"), 4.0); // accepted
registry.fill(HIST("hEventCounter"), 4.0); //|Zvtx| < 10 cm

for (auto& track : tracks) {
if (!track.has_collision()) {
Expand Down Expand Up @@ -733,6 +801,14 @@ struct trackPIDQA {

} // end of track loop
} // end of process

void processDummy(soa::Join<aod::Collisions, aod::EvSels>::iterator const& collision)
{
// do nothing
}

PROCESS_SWITCH(trackPIDQA, processQA, "Run PID QA for barrel tracks", true);
PROCESS_SWITCH(trackPIDQA, processDummy, "Dummy function", false);
};

WorkflowSpec defineDataProcessing(ConfigContext const& cfgc)
Expand Down