Dissertation / PhD Thesis

PUBDB-2026-01899

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Double Sliced Event Generation - Novel Method for Multijet Background Estimation in Proton-Proton Collisions in Environments with High Pileup Activity: Methodological Discussion in the Context of Invisible Higgs Boson Decay Searches in the Vector Boson Fusion channel with ATLAS Detector

Glemza, G. (Corresponding author)DESY* ; Sander, C. (Thesis advisor)DESY* ; Gallo-Voss, E. (Thesis advisor)DESY*

2026

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Please use a persistent id in citations: urn:nbn:de:gbv:18-ediss-138080  doi:10.3204/PUBDB-2026-01899

Abstract: In this thesis, a novel method of multijet background estimation in pp collisions in environments sensitive to high pileup activity is introduced. The methodology and developmentof the method is discussed in the context of searches for invisible Higgs boson decays with vector boson fusion signature using the ATLAS detector. The method aims to decrease thestatistical uncertainty of the multijet background in the signal region of the search as well as to enable additional machine learning techniques for the search. The method is based onMonte Carlo simulation of multijet events and their smearing. Additionally, the method employs various statistics and performance improving techniques. The proposed method isvalidated in a control region using data collected between 2015 and 2018 at centre-of-mass energy of √s = 13.0 TeV and between 2022 and 2023 at centre-of-mass energy of √s = 13.6 TeV.The multijet background estimation is presented for two signal regions: One signal region represents the signal region used in the previous iteration of the search at √s = 13.0 TeV.The other region represents the next iteration of the invisible Higgs decay search’s possible signal region definition. When compared with the previous iteration’s multijet backgroundprediction based on data-taking conditions between 2015 and 2018, the proposed method’s estimation is found to be in agreement.

Note: Dissertation, University of Hamburg, 2026

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Contributing Institute(s):

1. LHC/CMS Experiment (CMS)
2. LHC/ATLAS Experiment (ATLAS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)

Experiment(s):

1. LHC: ATLAS

Appears in the scientific report 2026

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