Authors:
- Nominated as an outstanding contribution by Tokyo Institute of Technology’s Physics Department in 2015
- Describes the theoretical background of a supersymmetry model, focusing on a “natural” scenario, in light of the latest experimental results
- Summarizes the latest results of searches for a scalar top quark with ATLAS
- Includes supplementary material: sn.pub/extras
Part of the book series: Springer Theses (Springer Theses)
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Table of contents (8 chapters)
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Front Matter
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Back Matter
About this book
This book reports a search for theoretically natural supersymmetry (SUSY) at the Large Hadron Collider (LHC). The data collected with the ATLAS detector in 2012 corresponding to 20 /fb of an integrated luminosity have been analyzed for stop pair production in proton–proton collisions at a center-of-mass energy of 8 TeV at the Large Hadron Collider (LHC) in the scenario of the higgsino-like neutralino.
The author focuses on stop decaying into a bottom quark and chargino. In the scenario of the higgsino-like neutralino, the mass difference between charginos and neutralinos (Δm) is expected to be small, and observable final-state particles are likely to have low-momentum (soft). The author develops a dedicated analysis with a soft lepton as a probe of particles from chargino decay, which
suppresses the large amount of backgrounds. As a result of the analysis, no significant SUSY signal is observed. The 95% confidence-level exclusion limits are set to masses of stop and neutralino assuming Δm = 20 GeV. The region with ΔM (the mass difference between stop and neutralino) < 70 GeV is excluded for the first time at stop mass of less than 210 GeV. The author also excludes the signals with ΔM > 120 GeV up to 600 GeV of stop mass with neutralino mass of less than 280 GeV. The author clearly shows very few remaining parameter spaces for light stop (e.g., topology of stop decay is extremely similar to the SM top quark) by combining his results and previous ATLAS analyses. His results provide a strong constraint to searches for new physics in the future.
Authors and Affiliations
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Faculty of Science Bldg.1 (10F), ICEPP, The University of Tokyo, Bunkyo-ku, Tokyo, Japan
Takuya Nobe
Bibliographic Information
Book Title: Search for Scalar Top Quarks and Higgsino-Like Neutralinos
Book Subtitle: SUSY Hunting With a “Soft” Lepton at the LHC
Authors: Takuya Nobe
Series Title: Springer Theses
DOI: https://doi.org/10.1007/978-981-10-0003-4
Publisher: Springer Singapore
eBook Packages: Physics and Astronomy, Physics and Astronomy (R0)
Copyright Information: Springer Science+Business Media Singapore 2016
Hardcover ISBN: 978-981-10-0001-0Published: 08 December 2015
Softcover ISBN: 978-981-10-9061-5Published: 27 March 2019
eBook ISBN: 978-981-10-0003-4Published: 30 November 2015
Series ISSN: 2190-5053
Series E-ISSN: 2190-5061
Edition Number: 1
Number of Pages: XII, 224
Number of Illustrations: 103 b/w illustrations, 19 illustrations in colour
Topics: Particle Acceleration and Detection, Beam Physics, Measurement Science and Instrumentation