Skip to main content
  • Book
  • © 2022

Electroweak Gauginos with Highly Boosted Hadronically Decaying Bosons at the LHC

Authors:

  • Nominated as an outstanding Ph.D. thesis by Kyoto University

  • Search for electroweak gauginos in the various models using SUSY parameter scans

  • The first time to search for electroweak gauginos directly at LHC using fully hadronic final state

Part of the book series: Springer Theses (Springer Theses)

Buying options

Hardcover Book USD 199.99
Price excludes VAT (USA)
This title has not yet been released. You will be able to pre-order it soon.

About this book

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.

Keywords

  • Gaugino
  • Wino, Higgsino, Bino
  • Gravitino
  • Boosted Boson Tagging
  • Dark Matter
  • Muon G-2 Anomaly
  • Naturalness
  • Supersymmetry (SUSY)
  • Electroweak Gauginos
  • Axino
  • Large Hadron Collider (LHC)
  • ATLAS

Authors and Affiliations

  • Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization, Tsukuba, Japan

    Yuta Okazaki

About the author

Yuta Okazaki received the Bachelor of Science, Master of Science, and Ph.D degrees from Kyoto University in 2016, 2018, and 2022, respectively.

From September 2021, he is currently a researcher belonging to High Energy Accelerator Research Organization (KEK) in Japan. His research interests include the anomalous magnetic moment of muon and he works in the muon g-2/EDM groups to measure the nature of muon in J-PARC.

From April 2019 to September 2021, he was a recipient of the Research Fellowship of the Japan Society for the Promotion of Science. From April 2016 to September 2021, he worked as a collaboration member of the ATLAS experiment and searched for electroweak supersymmetric particles.

Bibliographic Information

  • Book Title: Electroweak Gauginos with Highly Boosted Hadronically Decaying Bosons at the LHC

  • Authors: Yuta Okazaki

  • Series Title: Springer Theses

  • Publisher: Springer Singapore

  • eBook Packages: Physics and Astronomy, Physics and Astronomy (R0)

  • Copyright Information: The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2022

  • Series ISSN: 2190-5053

  • Series E-ISSN: 2190-5061

  • Edition Number: 1

  • Number of Pages: XVIII, 240

  • Number of Illustrations: 4 b/w illustrations, 123 illustrations in colour

  • Topics: Particle Physics, Elementary Particles, Quantum Field Theory

Buying options

Hardcover Book USD 199.99
Price excludes VAT (USA)
This title has not yet been released. You will be able to pre-order it soon.