eprintid: 31386
rev_number: 13
eprint_status: archive
userid: 6554
dir: disk0/00/03/13/86
datestamp: 2022-03-16 10:14:26
lastmod: 2022-03-17 15:33:41
status_changed: 2022-03-16 10:14:26
type: doctoralThesis
metadata_visibility: show
creators_name: Bellagente, Marco
title: Go with the Flow: Normalising Flows applications for High Energy Physics
subjects: ddc-530
divisions: i-130300
adv_faculty: af-13
abstract: Deep Learning is becoming a standard tool across science and industry to optimally solve a variety of tasks. A challenge of great importance for the research program carried over at the Large Hadron Collider is realising a generative model to sample synthetic data from a desired probability density. While generative models such as Generative Adversarial Networks and Normalizing Flows have been originally designed to solve Machine Learning tasks such as classification and data generation, we illustrate how they can also be employed to statistically invert Monte Carlo simulations of detector effects. In particular, we show how conditional Generative Adversarial Networks and Normalizing Flows are capable of unfolding detector effects, using ZW production at the LHC as a benchmarking process.
Two technical by-products of interest stemming from these studies are the introduction of a Bayesian Normalizing Flow and of the Latent Space Refinement (LaSeR) protocol. The former has been in- troduced in order to address the crucial question of explainability and uncertainty estimation of deep generative models, which is achieved by reformulating the training and prediction phases of Normal- izing Flows as a Bayesian inference task. Finally, LaSeR is a method to refine a model’s output using classifier weights. We show how LaSeR can critically improve the performances of a Normalizing Flow whenever the training data contains topological obstructions.
date: 2022
id_scheme: DOI
id_number: 10.11588/heidok.00031386
ppn_swb: 179575382X
own_urn: urn:nbn:de:bsz:16-heidok-313863
date_accepted: 2022-01-26
advisor: HASH(0x561a62945ee8)
language: eng
bibsort: BELLAGENTEGOWITHTHEF2022
full_text_status: public
place_of_pub: Heidelberg
citation:   Bellagente, Marco  (2022) Go with the Flow: Normalising Flows applications for High Energy Physics.  [Dissertation]     
document_url: https://archiv.ub.uni-heidelberg.de/volltextserver/31386/1/thesis.pdf