Publication

Machine Learning for a search of Heavy Neutral Leptons with taus at the final state with CMS

2023

Abstract

This report presents a project of TPIVb at LPHE in which I used deep neural networks (DNN) to distinguish heavy neutral leptons decays with 3 leptons in the final state from various types of background. At least one of the 3 leptons is required to be a hadronic tau. The events used to train the DNN were created through a Monte Carlo simulation. Several kinematic variables were created out of variables that can typically be extracted from the quantities reconstructed by CMS, to be used as features for the DNN. A feature selection was done to determine which of these features plays a significant role in the DNN's ability to distinguish signal versus background. Finally, the performance of the DNN was evaluated in the different signal points.

Official source

https://infoscience.epfl.ch/entities/publication/16d46a3f-699e-4bc9-9923-cb6979de4211

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2023

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/16d46a3f-699e-4bc9-9923-cb6979de4211

About this result

Related concepts (32)

Lepton

In particle physics, a lepton is an elementary particle of half-integer spin (spin ) that does not undergo strong interactions. Two main classes of leptons exist: charged leptons (also known as the electron-like leptons or muons), and neutral leptons (better known as neutrinos). Charged leptons can combine with other particles to form various composite particles such as atoms and positronium, while neutrinos rarely interact with anything, and are consequently rarely observed. The best known of all leptons is the electron.

Sterile neutrino

Sterile neutrinos (or inert neutrinos) are hypothetical particles (neutral leptons – neutrinos) that are believed to interact only via gravity and not via any of the other fundamental interactions of the Standard Model. The term sterile neutrino is used to distinguish them from the known, ordinary active neutrinos in the Standard Model, which carry an isospin charge of ± 1/ 2 and engage in the weak interaction. The term typically refers to neutrinos with right-handed chirality (see right-handed neutrino), which may be inserted into the Standard Model.

Tau (particle)

The tau (τ), also called the tau lepton, tau particle, tauon or tau electron, is an elementary particle similar to the electron, with negative electric charge and a spin of 1/2. Like the electron, the muon, and the three neutrinos, the tau is a lepton, and like all elementary particles with half-integer spin, the tau has a corresponding antiparticle of opposite charge but equal mass and spin. In the tau's case, this is the "antitau" (also called the positive tau). Tau particles are denoted by the symbol _Tau- and the antitaus by _Tau+.

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Machine Learning for a search of Heavy Neutral Leptons with taus at the final state with CMS

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