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[ALICE3] A3: Add option for ev time #11007

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njacazio merged 2 commits into from
Apr 28, 2025
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[ALICE3] A3: Add option for ev time #11007

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Add option for ev time
njacazio Apr 28, 2025
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njacazio Apr 28, 2025
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50 changes: 28 additions & 22 deletions ALICE3/TableProducer/OTF/onTheFlyTOFPID.cxx
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
// Copyright 2019-2020 CERN and copyright holders of ALICE O2.

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[doc/file] 

Provide mandatory file documentation.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
Expand All @@ -8,10 +8,18 @@
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.

//
// Task to add a table of track parameters propagated to the primary vertex
//
/// \file onTheFlyTOFPID.cxx
///
/// \brief This task goes straight from a combination of track table and mcParticles
/// and a custom TOF configuration to a table of TOF NSigmas for the particles
/// being analysed. It currently contemplates 5 particle types:
/// electrons, pions, kaons, protons and muons
///
/// More particles could be added but would have to be added to the LUT
/// being used in the onTheFly tracker task.
///
/// \author David Dobrigkeit Chinellato, UNICAMP
/// \author Nicola Nicassio, University and INFN Bari

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[doc/file] 

Documentation for \file is missing, incorrect or misplaced.

#include <utility>
#include <map>
Expand Down Expand Up @@ -45,18 +53,6 @@
#include "TableHelper.h"
#include "ALICE3/Core/DelphesO2TrackSmearer.h"

/// \file onTheFlyTOFPID.cxx
///
/// \brief This task goes straight from a combination of track table and mcParticles
/// and a custom TOF configuration to a table of TOF NSigmas for the particles
/// being analysed. It currently contemplates 5 particle types:
/// electrons, pions, kaons, protons and muons
///
/// More particles could be added but would have to be added to the LUT
/// being used in the onTheFly tracker task.
///
/// \author David Dobrigkeit Chinellato, UNICAMP, Nicola Nicassio, University and INFN Bari

using namespace o2;
using namespace o2::framework;

Expand Down Expand Up @@ -150,10 +146,13 @@
}

if (plotsConfig.doQAplots) {
const AxisSpec axisdNdeta{200, 0.0f, 1000.0f, Form("dN/d#eta in |#eta| < %f", simConfig.multiplicityEtaRange.value)};

histos.add("h1dNdeta", "h2dNdeta", kTH1F, {axisdNdeta});
histos.add("h2dEventTime", "h2dEventTime", kTH2F, {{200, -1000, 1000, "computed"}, {200, -1000, 1000, "generated"}});
histos.add("h1dEventTimegen", "h1dEventTimegen", kTH1F, {{200, -1000, 1000, "generated"}});
histos.add("h1dEventTimerec", "h1dEventTimerec", kTH1F, {{200, -1000, 1000, "computed"}});
histos.add("h1dEventTimeres", "h1dEventTimeres", kTH1F, {{300, 0, 300, "resolution"}});
histos.add("h2dEventTimeres", "h2dEventTimeres", kTH2F, {axisdNdeta, {300, 0, 300, "resolution"}});

const AxisSpec axisMomentum{static_cast<int>(plotsConfig.nBinsP), 0.0f, +10.0f, "#it{p} (GeV/#it{c})"};
const AxisSpec axisMomentumSmall{static_cast<int>(plotsConfig.nBinsP), 0.0f, +1.0f, "#it{p} (GeV/#it{c})"};
Expand Down Expand Up @@ -181,7 +180,7 @@

std::string particle_names1[5] = {"#it{e}", "#it{#mu}", "#it{#pi}", "#it{K}", "#it{p}"};
std::string particle_names2[5] = {"Elec", "Muon", "Pion", "Kaon", "Prot"};
for (int i_true = 0; i_true < 5; i_true++) {

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std::string name_title_inner_track_res = "h2dInnerTimeResTrack" + particle_names2[i_true] + "VsP";
std::string name_title_inner_total_res = "h2dInnerTimeResTotal" + particle_names2[i_true] + "VsP";
std::string name_title_outer_track_res = "h2dOuterTimeResTrack" + particle_names2[i_true] + "VsP";
Expand All @@ -194,8 +193,8 @@
histos.add(name_title_outer_total_res.c_str(), name_title_outer_total_res.c_str(), kTH2F, {axisMomentum, axisTotalTimeRes});
}

for (int i_true = 0; i_true < 5; i_true++) {

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for (int i_hyp = 0; i_hyp < 5; i_hyp++) {

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std::string name_title_inner = "h2dInnerNsigmaTrue" + particle_names2[i_true] + "Vs" + particle_names2[i_hyp] + "Hypothesis";
std::string name_title_outer = "h2dOuterNsigmaTrue" + particle_names2[i_true] + "Vs" + particle_names2[i_hyp] + "Hypothesis";
if (i_true == i_hyp) {
Expand Down Expand Up @@ -299,7 +298,7 @@
cosAngle = (point2[0] - trcCircle.xC) * (startPoint[0] - trcCircle.xC) + (point2[1] - trcCircle.yC) * (startPoint[1] - trcCircle.yC);
}
cosAngle /= modulus;
length = trcCircle.rC * TMath::ACos(cosAngle);

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Replace ROOT entities with equivalents from standard C++ or from O2.
length *= std::sqrt(1.0f + track.getTgl() * track.getTgl());
}
return length;
Expand Down Expand Up @@ -351,6 +350,7 @@
float sum = 0.;
float sumw = 0.;

// Todo: check the different mass hypothesis iteratively
for (const auto& track : tracks) {
auto pdgInfo = pdg->GetParticle(track.mPdgCode);
if (pdgInfo == nullptr) {
Expand Down Expand Up @@ -427,7 +427,7 @@

std::array<float, 6> mcPvCov = {0.};
o2::dataformats::VertexBase mcPvVtx({0.0f, 0.0f, 0.0f}, mcPvCov);
const float eventCollisionTimePS = collision.collisionTime() * 1e3; // convert ns to ps
const float eventCollisionTimePS = (simConfig.considerEventTime.value ? collision.collisionTime() * 1e3 : 0.f); // convert ns to ps
if (collision.has_mcCollision()) {
auto mcCollision = collision.mcCollision();
mcPvVtx.setX(mcCollision.posX());
Expand Down Expand Up @@ -459,6 +459,9 @@
dNdEta += 1.f;
}
}
if (plotsConfig.doQAplots) {
histos.fill(HIST("h1dNdeta"), dNdEta);
}

tracksWithTime.clear(); // clear the vector of tracks with time to prepare the cache for the next event
tracksWithTime.reserve(tracks.size());
Expand All @@ -474,7 +477,7 @@
float xPv = -100, trackLengthInnerTOF = -1, trackLengthOuterTOF = -1;
if (o2track.propagateToDCA(mcPvVtx, simConfig.dBz))
xPv = o2track.getX();
if (xPv > -99.) {

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trackLengthInnerTOF = trackLength(o2track, simConfig.innerTOFRadius, simConfig.dBz);
trackLengthOuterTOF = trackLength(o2track, simConfig.outerTOFRadius, simConfig.dBz);
}
Expand All @@ -499,7 +502,7 @@
auto recoTrack = getTrackParCov(track);
if (recoTrack.propagateToDCA(pvVtx, simConfig.dBz))
xPv = recoTrack.getX();
if (xPv > -99.) {

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trackLengthRecoInnerTOF = trackLength(recoTrack, simConfig.innerTOFRadius, simConfig.dBz);
trackLengthRecoOuterTOF = trackLength(recoTrack, simConfig.outerTOFRadius, simConfig.dBz);
}
Expand All @@ -519,16 +522,18 @@
// Now we compute the event time for the tracks

std::array<float, 2> tzero = {0.f, 0.f};
const bool etStatus = eventTime(tracksWithTime, tzero);
if (!etStatus) {
LOG(warning) << "Event time calculation failed with " << tracksWithTime.size() << " tracks";
if (simConfig.considerEventTime.value) {
const bool etStatus = eventTime(tracksWithTime, tzero);
if (!etStatus) {
LOG(warning) << "Event time calculation failed with " << tracksWithTime.size() << " tracks";
}
}

if (plotsConfig.doQAplots) {
histos.fill(HIST("h2dEventTime"), tzero[0], eventCollisionTimePS);
histos.fill(HIST("h1dEventTimegen"), eventCollisionTimePS);
histos.fill(HIST("h1dEventTimerec"), tzero[0]);
histos.fill(HIST("h1dEventTimeres"), tzero[1]);
histos.fill(HIST("h2dEventTimeres"), dNdEta, tzero[1]);
}

// Then we do a second loop to compute the measured quantities with the measured event time
Expand All @@ -543,6 +548,7 @@
const float trackLengthRecoOuterTOF = trkWithTime.mTrackLengthOuterTOF.first;
const float trackLengthInnerTOF = trkWithTime.mTrackLengthInnerTOF.second;
const float trackLengthOuterTOF = trkWithTime.mTrackLengthOuterTOF.second;
// Todo: remove the bias of the track used in the event time calculation for low multiplicity events
const float measuredTimeInnerTOF = trkWithTime.mInnerTOFTime.first - tzero[0];
const float measuredTimeOuterTOF = trkWithTime.mOuterTOFTime.first - tzero[0];
const float momentum = trkWithTime.mMomentum.first;
Expand Down Expand Up @@ -572,7 +578,7 @@
}
}

for (int ii = 0; ii < 5; ii++) {

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nSigmaInnerTOF[ii] = -100;
nSigmaOuterTOF[ii] = -100;

Expand Down Expand Up @@ -672,7 +678,7 @@
}

if (plotsConfig.doQAplots) {
for (int ii = 0; ii < 5; ii++) {

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if (std::fabs(mcParticle.pdgCode()) != pdg->GetParticle(lpdg_array[ii])->PdgCode()) {
continue;
}
Expand Down
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