Search for Rare Exclusive Decays of the Higgs and Z Bosons to a Meson and a Photon with the ATLAS Detector
Title | Search for Rare Exclusive Decays of the Higgs and Z Bosons to a Meson and a Photon with the ATLAS Detector PDF eBook |
Author | Rhys Edward Owen |
Publisher | |
Pages | 0 |
Release | 2018 |
Genre | |
ISBN |
Search for Higgs Boson Decays to Charm Quarks with the ATLAS Experiment and Development of Novel Silicon Pixel Detectors
Title | Search for Higgs Boson Decays to Charm Quarks with the ATLAS Experiment and Development of Novel Silicon Pixel Detectors PDF eBook |
Author | Maria Mironova |
Publisher | Springer Nature |
Pages | 206 |
Release | 2023-07-20 |
Genre | Science |
ISBN | 3031362209 |
This book explores the Higgs boson and its interactions with fermions, as well as the detector technologies used to measure it. The Standard Model of Particle Physics has been a groundbreaking theory in our understanding of the fundamental properties of the universe, but it is incomplete, and there are significant hints which require new physics. The discovery of the Higgs boson in 2012 was a substantial confirmation of the Standard Model, but many of its decay modes remain elusive. This book presents the latest search for Higgs boson decays into c-quarks using a proton-proton collision dataset collected by the ATLAS experiment at the Large Hadron Collider (LHC). This decay mode has yet to be observed and requires advanced machine learning algorithms to identify c-quarks in the experiment. The results provide an upper limit on the rate of Higgs boson decays to c-quarks and a direct measurement of the Higgs boson coupling strength to c-quarks. The book also discusses the future of particle physics and the need for significant improvements to the detector to cope with increased radiation damage and higher data rates at the High-Luminosity LHC. It presents the characterization of the ATLAS pixel detector readout chip for the inner detector upgrade (ITk). The chip was subjected to irradiations using X-rays and protons to simulate the radiation environment at the HL-LHC. The tests showed that all readout chip components, including the digital logic and analogue front-end, are sufficiently radiation-tolerant to withstand the expected radiation dose. Finally, this book describes monolithic pixel detectors as a possible technology for future pixel detectors. This book is ideal for individuals interested in exploring particle physics, the Higgs boson, and the development of silicon pixel detectors.
Searches for Rare Exclusive Higgs Boson Decays to a Meson and an Associated Photon with the ATLAS Detector
Title | Searches for Rare Exclusive Higgs Boson Decays to a Meson and an Associated Photon with the ATLAS Detector PDF eBook |
Author | James Harry Broughton |
Publisher | |
Pages | 0 |
Release | 2018 |
Genre | |
ISBN |
Searching for Rare and Forbidden Exclusive Higgs Boson Decays with the ATLAS Detector
Title | Searching for Rare and Forbidden Exclusive Higgs Boson Decays with the ATLAS Detector PDF eBook |
Author | Govindraj Singh Virdee |
Publisher | |
Pages | 0 |
Release | 2022 |
Genre | |
ISBN |
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Search for Lepton-flavour-violating Decays of the Higgs and Z Bosons with the ATLAS Detector
Title | Search for Lepton-flavour-violating Decays of the Higgs and Z Bosons with the ATLAS Detector PDF eBook |
Author | Hannah Arnold |
Publisher | |
Pages | |
Release | 2017 |
Genre | |
ISBN |
Search for Displaced Photons from Exotic Decays of the Higgs Boson with the ATLAS Detector
Title | Search for Displaced Photons from Exotic Decays of the Higgs Boson with the ATLAS Detector PDF eBook |
Author | Devin Mahon |
Publisher | |
Pages | |
Release | 2021 |
Genre | |
ISBN |
Agreement with background is observed with no significant excesses for any signal models considered. Limits at the 95% confidence level are placed on the branching ratio of the Higgs boson to two neutralinos in the context of the various signal models.
Search for Exotic Decays of a Higgs Boson Into Undetectable Particles and One Or More Photons
Title | Search for Exotic Decays of a Higgs Boson Into Undetectable Particles and One Or More Photons PDF eBook |
Author | |
Publisher | |
Pages | 26 |
Release | 2015 |
Genre | |
ISBN |
A search is presented for exotic decays of a Higgs boson into undetectable particles and one or two isolated photons in pp collisions at a center-of-mass energy of 8 TeV. The data correspond to an integrated luminosity of up to 19.4 inverse femtobarns collected with the CMS detector at the LHC. Higgs bosons produced in gluon-gluon fusion and in association with a Z boson are investigated, using models in which the Higgs boson decays into a gravitino and a neutralino or a pair of neutralinos, followed by the decay of the neutralino to a gravitino and a photon. The selected events are consistent with the background-only hypothesis, and limits are placed on the product of cross sections and branching fractions. Assuming a standard model Higgs boson production cross section, a 95% confidence level upper limit is set on the branching fraction of a 125 GeV Higgs boson decaying into undetectable particles and one or two isolated photons as a function of the neutralino mass. For this class of models and neutralino masses from 1 to 120 GeV an upper limit in the range of 7 to 13% is obtained. Further results are given as a function of the neutralino lifetime, and also for a range of Higgs boson masses.