Electroweak gauginos with highly boosted hadronically decaying bosons at the LHC / Yuta Okazaki.
Okazaki, Yuta, author.
2023
QC794.8.E44
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Title Electroweak gauginos with highly boosted hadronically decaying bosons at the LHC / Yuta Okazaki.
Author Okazaki, Yuta, author.
ISBN 9789811965937 (electronic bk.)
9811965935 (electronic bk.)
9789811965920 (print)
9811965927
DOI https://doi.org/10.1007/978-981-19-6593-7
Published Singapore : Springer, 2023.
Language English
Description 1 online resource (xviii, 220 pages) : illustrations (some color).
Item Number 10.1007/978-981-19-6593-7 doi
Call Number QC794.8.E44
Dewey Decimal Classification 539.7/544
Summary Supersymmetry (SUSY) introduces superpartners of the Standard Model (SM) particles. If their masses are typically O(100 GeV) O(TeV), a lightest neutralino can be a candidate for the dark matter, and the problem is solved by canceling the correction of the Higgs boson mass. Further, SUSY can explain the experimental result of the muon magnetic moment (g-2). This book presents a search for electroweakinos the superpartners of the SM electroweak bosons such as charginos and neutralinos using data at the LHC collected by the ATLAS detector. Pair-produced electroweakinos decay into the light ones and SM bosons (W/Z/h), and with the large mass difference between the heavy and light electroweakinos, the SM bosons have high momenta. In a fully hadronic final state, quarks decayed from the bosons are collimated, and can consequently be reconstructed as a single large-radius jet. This search has three advantages. The first is a statistical benefit by large branching ratios of the SM bosons. The second is to use characteristic signatures the mass and substructure of jets to identify as the SM bosons. The last is a small dependency on the signal model by targeting all the SM bosons. Thanks to them, the sensitivity is significantly improved compared to the previous analyses. Exclusion limits at the 95% confidence level on the heavy electroweakino mass parameter are set as a function of the light electroweakino mass parameter. They are set on wino or higgsino production models with various assumptions, such as the branching ratio of their decaying and the type of lightest SUSY particle. These limits are the most stringent limits. Besides, this book provides the most stringent constraints on SUSY scenarios motivated by the dark matter, the muon g-2 anomaly, and the naturalness.
Note Doctoral thesis accepted by Kyoto University, Kyoto, Japan.
Bibliography, etc. Note Includes bibliographical references.
Access Note Access limited to authorized users.
Source of Description Online resource; title from PDF title page (SpringerLink, viewed January 12, 2023).
Series Springer theses, 2190-5061
Available in Other Form Print version: 9789811965920
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Introduction
Theoretical Background
Experimental Apparatus
Data and Monte Carlo Simulations
Physics Object Reconstruction
Boson Tagging
Event Selection
Background Estimation
Systematic Uncertainties
Results
Discussions
Conclusions.

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