Top quark pair production at the LHC

<p><strong>R&amp;D Datasets containing all-hadronic, semi-leptonic and di-leptonic top quark pair events at the LHC.</strong></p> <p>Used in the development of PIPPIN: Particles Into Particles with Permutation Invariant Network</p> <p>&nbsp;</p> <p>The datasets contain a total of 40M ttbar events in the all-hadronic, semi-leptonic and di-leptonic decay channels, with jets matched to the truth partons in the top quark decays.</p> <p>&nbsp;</p> <p><strong>Event generation</strong></p> <ul> <li>Centre of Mass energy: 13 TeV</li> <li>MC Generator: PYTHIA v8.307</li> <li>Parton Shower and Hadronisation: PYTHIA v8.307</li> <li>Detector response: Delphes v3.4.2 using ATLAS-like geometry</li> <li>Jets reconstructed with anti-kt algorithm, R = 0.4, using FastJet</li> </ul> <p><strong>Event selection and truth matching</strong></p> <ul> <li>All events are required to have between 2 and 16 reconstructed jets</li> <li>Jets are required to fall within |&eta;| &lt; 2.5 and to have a minimum pT &gt; 25 GeV</li> <li>Leptons are required to fall within |&eta;|&lt;2.5 and to have a minimum pT &gt; 15 GeV</li> <li>Partons are matched to jets using&nbsp;<span><span><span><span><span>&Delta;</span><span>R</span></span></span></span></span>&nbsp;matching, with&nbsp;<span><span><span><span><span>&Delta;</span><span>R </span><span>&lt; </span><span>0.4</span></span></span></span></span></li> <li>Events with partons matched to multiple jets or jets to multiple partons are discarded</li> </ul> <p>The training dataset contains 37M events.<br>The validation dataset contains 0.8M events.<br>The testing dataset contains 2.4M events.</p> <p>&nbsp;</p> <p><strong>Dataset format</strong></p> <p>The dataset is in HDF5 format and the key 'delphes' contains the following numpy arrays:</p> <p>Truth information (parton-level):</p> <ul> <li><code>truth_leptons</code>, <code>truth_neutrinos</code>, <code>truth_quarks</code>: Truth level information of the final state partons <ul> <li><em>keys:</em> <code>PDGID</code>, <code>pt</code>, <code>eta</code>, <code>phi</code>, <code>mass</code></li> </ul> </li> <li><code>truth_particles</code>: Truth level information of the final state partons and the intermediate particles <ul> <li><em>keys:</em> <code>PDGID</code>, <code>pt</code>, <code>eta</code>, <code>phi</code>, <code>mass</code></li> </ul> </li> </ul> <p>Reconstructed information (detector-level):</p> <ul> <li><code>leptons</code>: The zero padded reconstructed leptons (0 to 2), ordered by decay channel <ul> <li><em>keys:</em> <code>pt</code>, <code>eta</code>, <code>phi</code>, <code>energy</code>, <code>charge</code>, <code>type</code></li> </ul> </li> <li><code>MET</code>: The missing transverse energy <ul> <li><em>keys:</em> <code>MET</code>, <code>phi</code></li> </ul> </li> <li><code>jets</code>: The zero padded reconstructed jets (2 to 16), ordered by pT <ul> <li><em>keys:</em> <code>pt</code>, <code>eta</code>, <code>phi</code>, <code>energy</code>, <code>is_tagged</code>, <code>is_tau</code></li> </ul> </li> </ul> <p>Miscellaneous information:</p> <ul> <li><code>decay_channel</code>: The decay channel of the event <ul> <li>0b00 for all-hadronic, 0b01 for semi-leptonic (from Top), 0b10 for semi-leptonic (from Anti-Top), 0b11 for di-leptonic</li> </ul> </li> <li><code>matchability</code>: Which partons are matched to a reconstructed object <ul> <li>Binary representation with bits corresponding to each parton (length 6) 0b111111</li> <li>From left to right:&nbsp;b1, q1_W1, q2_W1, b2, q1_W2,&nbsp;q2_W2(b1/W1 = from Top, b2/W2 = from Anti-Top)</li> <li>0b111000 means Top fully matched, 0b000111 means Anti-Top fully matched, 0b111111 means both Tops fully matched, etc.</li> </ul> </li> <li><code>jet_indices</code>: Integer corresponding to the parton a jet is matched to <ul> <li>From 0 to 5:&nbsp;b1, q1_W1, q2_W1, b2, q1_W2,&nbsp;q2_W2(b1/W1 = from Top, b2/W2 = from Anti-Top)</li> <li>-1 indicates not matched to a parton</li> </ul> </li> <li><code>nleptons</code>,&nbsp;<code>njets</code>,&nbsp;<code>nbjets</code>: How many leptons, jets, b-jets in the event</li> </ul>