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Searching for Squarks: in Compressed States and States with Jets from Charm Quarks with the Atlas Detector: Springer Theses

Autor Samuel Jones
en Limba Engleză Paperback – 28 aug 2021
This thesis focuses on searches for squarks with the ATLAS detector in "compressed" scenarios where the scalar top is very close in mass to the lightest supersymmetric particle. These models are theoretically appealing because the presence of a quasi-degenerate scalar top enhances the self-annihilation cross-section of the lightest supersymmetric particle, acting therefore as a regulator of the dark matter relic density. Two main analyses are presented: the first is a search for scalar tops decaying to charm quarks. The identification of jets originating from the charm quark is very challenging due to its short lifetime. The calibration of tools for charm-tagging has paved the way to measuring the decay of the Higgs boson to pairs of charm quarks. The second analysis presented is the development of a novel technique for reconstructing low momentum b-hadrons. This tool has enabled the ATLAS collaboration to explore topologies that were previously inaccessible.
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Specificații

ISBN-13: 9783030542900
ISBN-10: 3030542904
Ilustrații: XVIII, 223 p. 136 illus., 109 illus. in color.
Dimensiuni: 155 x 235 mm
Greutate: 0.35 kg
Ediția:1st ed. 2020
Editura: Springer International Publishing
Colecția Springer
Seria Springer Theses

Locul publicării:Cham, Switzerland

Cuprins

Introduction.- Theoretical Background.- The ATLAS Experiment.- Data Acquisition and Reconstruction.- Search for SUSY in Final States with Jets from Charm Quarks.- Soft b-tagging in Compressed SUSY Scenarios.- Conclusion.- Appendix.

Textul de pe ultima copertă

This thesis focuses on searches for squarks with the ATLAS detector in "compressed" scenarios where the scalar top is very close in mass to the lightest supersymmetric particle. These models are theoretically appealing because the presence of a quasi-degenerate scalar top enhances the self-annihilation cross-section of the lightest supersymmetric particle, acting therefore as a regulator of the dark matter relic density. Two main analyses are presented: the first is a search for scalar tops decaying to charm quarks. The identification of jets originating from the charm quark is very challenging due to its short lifetime. The calibration of tools for charm-tagging has paved the way to measuring the decay of the Higgs boson to pairs of charm quarks. The second analysis presented is the development of a novel technique for reconstructing low momentum b-hadrons. This tool has enabled the ATLAS collaboration to explore topologies that were previously inaccessible.

Caracteristici

Nominated as an outstanding Ph.D. thesis by the University of Sussex, Brighton, United Kingdom Presents searches for the supersymmetric partner of the quark, the squark, in "compressed scenarios Develops a novel technique for reconstructing low momentum b-hadrons