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Searches For Rare Exclusive Higgs Boson Decays To A Meson And An Associated Photon With The Atlas Detector
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Book Synopsis Searches for Rare Exclusive Higgs Boson Decays to a Meson and an Associated Photon with the ATLAS Detector by : James Harry Broughton
Download or read book Searches for Rare Exclusive Higgs Boson Decays to a Meson and an Associated Photon with the ATLAS Detector written by James Harry Broughton and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Rare Exclusive Decays of the Higgs and Z Bosons to a Meson and a Photon with the ATLAS Detector by : Rhys Edward Owen
Download or read book Search for Rare Exclusive Decays of the Higgs and Z Bosons to a Meson and a Photon with the ATLAS Detector written by Rhys Edward Owen and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Higgs Boson Decays to Charm Quarks with the ATLAS Experiment and Development of Novel Silicon Pixel Detectors by : Maria Mironova
Download or read book Search for Higgs Boson Decays to Charm Quarks with the ATLAS Experiment and Development of Novel Silicon Pixel Detectors written by Maria Mironova and published by Springer Nature. This book was released on 2023-07-20 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Searching for Rare and Forbidden Exclusive Higgs Boson Decays with the ATLAS Detector by : Govindraj Singh Virdee
Download or read book Searching for Rare and Forbidden Exclusive Higgs Boson Decays with the ATLAS Detector written by Govindraj Singh Virdee and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This note is part of Quality testing.
Book Synopsis Search for Displaced Photons from Exotic Decays of the Higgs Boson with the ATLAS Detector by : Devin Mahon
Download or read book Search for Displaced Photons from Exotic Decays of the Higgs Boson with the ATLAS Detector written by Devin Mahon and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Seeing the Light (Higgs) by : Khilesh Pradip Mistry
Download or read book Seeing the Light (Higgs) written by Khilesh Pradip Mistry and published by . This book was released on 2019 with total page 498 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents two results involving Standard Model Higgs bosons decaying to at least one photon. These analyses are performed using 79.8/fb-1 of proton-proton collisions collected at √s=13 TeV with the ATLAS detector at the Large Hadron Collider.
Book Synopsis Search for Higgs Boson Decays to Beyond-the-Standard-Model Light Bosons in Four-lepton Events with the ATLAS Detector at the LHC. by : Justin Chiu
Download or read book Search for Higgs Boson Decays to Beyond-the-Standard-Model Light Bosons in Four-lepton Events with the ATLAS Detector at the LHC. written by Justin Chiu and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the search for the dark sector process h -> Zd Zd -> 4l in events collected by the ATLAS detector at the Large Hadron Collider in 2015--2018. In this theorized process, the Standard Model Higgs boson (h) decays to four leptons via two intermediate Beyond-the-Standard-Model particles each called Zd. This process arises from interactions of the Standard Model with a dark sector. A dark sector consists of one or more new particles that have limited or zero interaction with the Standard Model, such as the new vector boson Zd (dark photon). It could have a rich and interesting phenomenology like the visible sector (the Standard Model) and could naturally address many outstanding problems in particle physics. For example, it could contain a particle candidate for dark matter. In particular, Higgs decays to Beyond-the-Standard-Model particles are well-motivated theoretically and are not tightly constrained; current measurements of Standard Model Higgs properties permit the fraction of such decays to be as high as approximately 30%. The results of this search do not show evidence for the existence of the h -> Zd Zd -> 4l process and are therefore interpreted in terms of upper limits on the branching ratio B(h -> Zd Zd) and the effective Higgs mixing parameter kappa^prime.
Book Synopsis Search for the Bb ̄ ̄ Decay of the Standard Model Higgs Boson in Associated (W/Z)H Production with the ATLAS Detector by : Simone Amoroso
Download or read book Search for the Bb ̄ ̄ Decay of the Standard Model Higgs Boson in Associated (W/Z)H Production with the ATLAS Detector written by Simone Amoroso and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Measurement of the Recently Discovered Higgs Boson in the Decay Into Two Photons with Associated Jets, Using the ATLAS Detector at the LHC. by : Robert J. B. Cantrill
Download or read book A Measurement of the Recently Discovered Higgs Boson in the Decay Into Two Photons with Associated Jets, Using the ATLAS Detector at the LHC. written by Robert J. B. Cantrill and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Novel Search for Exotic Decays of the Higgs Boson with the ATLAS Detector and Enhancing the Physics Potential of the Large Hadron Collider and Atom Interferometers with New Techniques by : Murtaza Safdari
Download or read book A Novel Search for Exotic Decays of the Higgs Boson with the ATLAS Detector and Enhancing the Physics Potential of the Large Hadron Collider and Atom Interferometers with New Techniques written by Murtaza Safdari and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fundamental physics research aims to understand the theory of particle interactions, the Standard Model (SM) of particle physics being the current best theory of the electroweak and strong forces. Modern efforts seeks to explain phenomenon like the matter antimatter asymmetry of the universe and the nature of dark matter using various experimental modalities such as terrestrial particle colliders like the Large Hadron Collider (LHC). The ATLAS detector on the LHC is conducting a diverse physics program of precision SM measurements and searches for Physics beyond the SM using deeply inelastic scattering products to study fundamental physics. The original research presented here uses proton collision data from the ATLAS detector to search for an exotic decay mode of the Higgs boson coupling to a new light scalar field. Additionally, two research projects are presented to improve the performance of the ATLAS detector. The first introduces a novel algorithm to improve the efficiency of locating interesting physics within saved events. The second improves the jet calibration procedure by enabling the use of gradient based regression with a novel objective function along with a unified neural network based framework. Additionally, a network of quantum sensors are in development to enhance the physics reach of modern detectors and expand the set of models of new physics that can be experimentally probed. One such technology is atomic gradiometer interferometric sensors, like the MAGIS-100 experiment, that utilize matter waves to search for ultralight bosonic dark matter. The research and development of a novel light field imaging device is presented here for the MAGIS-100 experiment, as part of a burgeoning collaboration between the high energy physics (HEP) and the atomic, molecular, and optical (AMO) physics communities.
Book Synopsis Evidence for Higgs Boson Decays to a Low Mass Lepton Pair and a Photon with the ATLAS Detector at the LHC by : Artem Basalaev
Download or read book Evidence for Higgs Boson Decays to a Low Mass Lepton Pair and a Photon with the ATLAS Detector at the LHC written by Artem Basalaev and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Nothing by : William Balunas
Download or read book A Search for Nothing written by William Balunas and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a search for invisible decays of the Higgs boson using the vector boson fusion channel. This uses 36 fb-1 of proton-proton collision data at [square root] s = 13 TeV using the ATLAS detector at the Large Hadron Collider. The experimental methods for understanding the signal and background processes as well as detector effects are described in detail. The search is carried out in several regions defined by kinematic requirements on the final-state objects, and the observed event yields are used in a profile-likelihood fit in order to constrain the backgrounds. The results are interpreted using a modified frequentist method and are found to be consistent with the Standard Model expectations. An upper limit of 34% (28% expected) at 95% C.L. is placed on the invisible branching ratio of the Higgs boson. Re-interpretation of these results in terms of dark matter is also discussed, in the context of the Higgs portal and other simplified models.
Book Synopsis Search for Invisible Decays of the Higgs Boson Produced Via Vector Boson Fusion at the ATLAS Detector with 139 Fb-1 of Integrated Luminosity by : Pablo Andres Rivadeneira Bracho
Download or read book Search for Invisible Decays of the Higgs Boson Produced Via Vector Boson Fusion at the ATLAS Detector with 139 Fb-1 of Integrated Luminosity written by Pablo Andres Rivadeneira Bracho and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Higgs Boson Decays in the H2!W+W- 2!vlv Channel Via Vector Boson Fusion with the ATLAS Detector at the LHC by : Bonnie Kar Bo Chow
Download or read book Search for Higgs Boson Decays in the H2!W+W- 2!vlv Channel Via Vector Boson Fusion with the ATLAS Detector at the LHC written by Bonnie Kar Bo Chow and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Constraints on New Phenomena Via Higgs Boson Couplings and Invisible Decays with the ATLAS Detector by :
Download or read book Constraints on New Phenomena Via Higgs Boson Couplings and Invisible Decays with the ATLAS Detector written by and published by . This book was released on 2015 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb-1 of pp collision data at √s=7 TeV and 20.3 fb-1 at √s=8 TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the [gamma][gamma], ZZ, W W , Z[gamma], bb, [tau] [tau] , and [mu][mu] decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. The limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the [gamma][gamma] and ZZ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of mA > 370 GeV in the "hMSSM" simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Finally, direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with W/Z (Z → ll, W/Z → jj) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. As a result, the use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter.
Book Synopsis Rare Decays of Light Mesons by : Benjamin Mayer
Download or read book Rare Decays of Light Mesons written by Benjamin Mayer and published by Atlantica Séguier Frontières. This book was released on 1990 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Exotic Higgs Decays by : Jackson Burzynski
Download or read book A Search for Exotic Higgs Decays written by Jackson Burzynski and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work describes a search for exotic decays of the Higgs boson to two long-lived, neutral, spin-0 particles which subsequently decay to pairs of b quarks, giving the striking signature of displaced hadronic jets in the ATLAS inner detector. Several other ATLAS searches have probed this decay topology previously, excluding branching ratios of the Higgs boson to long-lived particles (LLPs) of more than 10% for proper lifetimes greater than 100mm. These searches relied on dedicated triggers designed to select events with LLPs decaying in the ATLAS calorimeter or muon spectrometer. The lack of an equivalent trigger for LLP decays in the ATLAS inner detector has been a limiting factor in probing LLP lifetimes less than 100mm. To circumvent the difficulty of triggering on LLP decays, the search presented in this thesis exploits the ZH associated production mode, relying on leptonic trigger signatures to select interesting events. This is the first search for Higgs boson decays into LLPs to exploit this analysis methodology and additionally makes use of several novel methods for both background rejection and background estimation. No excess over Standard Model predictions is observed, and upper limits are set on the branching ratio of the Higgs boson to LLPs . Depending on the mass of the LLP, branching ratios greater than 10% are excluded for lifetimes as small as 4mm and as large as 100mm, probing an important gap in the ATLAS exotic Higgs decay programme. In comparison to the previous searches for Higgs decays to LLPs, these are among the most stringent limits placed on this scenario, and for LLPs with masses below 40 GeV these results represent the strongest existing constraints on the branching ratio of the Higgs boson to LLPs in this lifetime regime.
