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[PWGEM] add additional max. mass pair cut to reduce number of events #17571

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[PWGEM] add additional max. mass pair cut to reduce number of events #17571

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29 changes: 26 additions & 3 deletions PWGEM/Dilepton/TableProducer/filterEoI.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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[name/workflow-file] 

Name of a workflow file must match the name of the main struct in it (without the PWG prefix). (Class implementation files should be in "Core" directories.)

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[name/o2-task] 

Specify task name only when it cannot be derived from the struct name. Only append to the default name.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
Expand All @@ -19,6 +19,7 @@

#include "Common/Core/TableHelper.h"

#include <Framework/ASoAHelpers.h>
#include <Framework/AnalysisDataModel.h>
#include <Framework/AnalysisHelpers.h>
#include <Framework/AnalysisTask.h>
Expand All @@ -28,6 +29,7 @@
#include <Framework/InitContext.h>
#include <Framework/runDataProcessing.h>

#include <Math/Vector4D.h>
#include <TH1.h>

#include <cstdint>
Expand All @@ -53,6 +55,7 @@
Configurable<int> minNphotons{"minNphotons", 1, "min number of photon candidates per collision"};
Configurable<std::string> taskNameForNelectron{"taskNameForNelectron", "skimmer-primary-electron", "task name where minNelectron is defined."};
Configurable<std::string> varNameForNelectron{"varNameForNelectron", "minNelectron", "variable name for minNelectron"};
Configurable<float> maxMinvPair{"maxMinvPair", -1.f, "keep events only if at least one photon pair has q_inv below this (GeV/c); negative = disabled"};

HistogramRegistry fRegistry{"output"};
void init(o2::framework::InitContext& initContext)
Expand All @@ -65,8 +68,9 @@
LOGF(info, "minNelectron = %d", minNelectron.value);
LOGF(info, "minNmuon = %d", minNmuon.value);
LOGF(info, "minNphotons = %d", minNphotons.value);
LOGF(info, "maxMinvPair = %f", static_cast<float>(maxMinvPair.value));

auto hEventCounter = fRegistry.add<TH1>("hEventCounter", "hEventCounter", kTH1D, {{8, 0.5f, 8.5f}});
auto hEventCounter = fRegistry.add<TH1>("hEventCounter", "hEventCounter", kTH1D, {{10, 0.5f, 10.5f}});
hEventCounter->GetXaxis()->SetBinLabel(1, "all");
hEventCounter->GetXaxis()->SetBinLabel(2, "event with electron");
hEventCounter->GetXaxis()->SetBinLabel(3, "event with forward muon");
Expand All @@ -75,6 +79,8 @@
hEventCounter->GetXaxis()->SetBinLabel(6, "event with electron and forward muon");
hEventCounter->GetXaxis()->SetBinLabel(7, "event with electron or forward muon or v0");
hEventCounter->GetXaxis()->SetBinLabel(8, "event with v0 or electrons from dalitz");
hEventCounter->GetXaxis()->SetBinLabel(9, "event with minNphotons v0s selection");
hEventCounter->GetXaxis()->SetBinLabel(10, "event with minNphotons v0s and low-M pair selection");
}

SliceCache cache;
Expand Down Expand Up @@ -109,14 +115,31 @@
}
if constexpr (static_cast<bool>(system & kPCM)) {
auto v0s_coll = v0s.sliceBy(perCollision_v0, collision.globalIndex());
if (v0s_coll.size() >= minNphotons) {
does_pcm_exist = true;
if (v0s_coll.size() >= 1) {
fRegistry.fill(HIST("hEventCounter"), 4);
}
if (v0s_coll.size() >= minNphotons) {
fRegistry.fill(HIST("hEventCounter"), 9);
bool hasLowMPair = (maxMinvPair < 0.f);
if (!hasLowMPair) {
for (const auto& [g1, g2] : combinations(CombinationsStrictlyUpperIndexPolicy(v0s_coll, v0s_coll))) {
ROOT::Math::PtEtaPhiMVector v1(g1.pt(), g1.eta(), g1.phi(), 0.f);
ROOT::Math::PtEtaPhiMVector v2(g2.pt(), g2.eta(), g2.phi(), 0.f);
if ((v1 + v2).M() < maxMinvPair) {
hasLowMPair = true;
break;
}
}
}
if (hasLowMPair) {
does_pcm_exist = true;
fRegistry.fill(HIST("hEventCounter"), 10);
}
}
}
if constexpr (static_cast<bool>(system & kElectronFromDalitz)) {
auto electronsda_coll = electronsda.sliceBy(perCollision_elda, collision.globalIndex());
if (electronsda_coll.size() >= 2) {

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[magic-number] 

Avoid magic numbers in expressions. Assign the value to a clearly named variable or constant.
does_electronda_exist = true;
}
}
Expand Down Expand Up @@ -193,5 +216,5 @@
};
WorkflowSpec defineDataProcessing(ConfigContext const& cfgc)
{
return WorkflowSpec{adaptAnalysisTask<filterEoI>(cfgc, TaskName{"filter-eoi"})};

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[name/o2-task] 

Device names filter-eoi and filter-eo-i generated from the specified task name filter-eoi and from the struct name filterEoI, respectively, differ in hyphenation. Consider fixing capitalisation of the struct name to FilterEoi and removing TaskName.
}
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