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Search For Displaced Photons From Exotic Decays Of The Higgs Boson With The Atlas Detector
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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 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 Springer Nature. This book was released on 2023-05-23 with total page 201 pages. Available in PDF, EPUB and Kindle. Book excerpt: The absence of new physics at the TeV scale observed thus far at the Large Hadron Collider (LHC) motivates an increasing focus on searches for weakly-coupled new particles and exotic signatures. In particular, particles with macroscopic mean proper lifetimes, known as long-lived particles (LLPs), are of significant interest due to their ability to elude the majority of searches which rely on the assumption that Beyond Standard Model particles decay close to the primary interaction point. Many models which aim to solve various issues with the Standard Model (SM) introduce new particles with lifetimes that are either unconstrained, or even shown to prefer the macroscopic regime. These theories often point to the Higgs boson as a possible portal to new physics, with exotic Higgs decays being the primary phenomenological consequence and means of discovery. It is well motivated both from theory and experimental constraints to consider the scenario in which the particles produced in these exotic decays have macroscopic proper lifetimes and give rise to unique detector signatures. 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 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.
Book Synopsis Search for Exotic Decays of the Higgs Boson Into B[overline] and Missing Transverse Momentum in Pp Collisions at [square Root]s by : [Study Group] ATLAS Collaboration CERN
Download or read book Search for Exotic Decays of the Higgs Boson Into B[overline] and Missing Transverse Momentum in Pp Collisions at [square Root]s written by [Study Group] ATLAS Collaboration CERN and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Displaced Leptons in the ATLAS Detector by : Lesya Horyn
Download or read book A Search for Displaced Leptons in the ATLAS Detector written by Lesya Horyn and published by Springer Nature. This book was released on 2022-02-07 with total page 146 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a search for long-lived particles decaying into displaced electrons and/or muons with large impact parameters. This signature provides unique sensitivity to the production of theoretical lepton-partners, sleptons. These particles are a feature of supersymmetric theories, which seek to address unanswered questions in nature. The signature searched for in this thesis is difficult to identify, and in fact, this is the first time it has been probed at the Large Hadron Collider (LHC). It covers a long-standing gap in coverage of possible new physics signatures. This thesis describes the special reconstruction and identification algorithms used to select leptons with large impact parameters and the details of the background estimation. The results are consistent with background, so limits on slepton masses and lifetimes in this model are calculated at 95% CL, drastically improving on the previous best limits from the Large Electron Positron Collider (LEP).
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 Exotic Decays of a Higgs Boson Into Undetectable Particles and One Or More Photons by :
Download or read book Search for Exotic Decays of a Higgs Boson Into Undetectable Particles and One Or More Photons written by and published by . This book was released on 2015 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Searching for New Physics in Decays of the Higgs Boson with the ATLAS Detector by : Elliot Thomas James Reynolds
Download or read book Searching for New Physics in Decays of the Higgs Boson with the ATLAS Detector written by Elliot Thomas James Reynolds and published by . This book was released on 2019 with total page 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 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 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 Out-of-time Decays of Stopped Particles at the ATLAS Detector by : Josh Cogan
Download or read book Search for Out-of-time Decays of Stopped Particles at the ATLAS Detector written by Josh Cogan and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: On July 4th 2012, the ATLAS and CMS experiments announced the discovery of a new particle, later declared to be one of possibly many Higgs bosons. The Higgs mechanism has been so successful explaining several striking features of fundamental particle physics it was the topic of the 2013 Nobel Prize in physics. However, this mechanism provides a few problems of it's own. Most importantly, both the mass of the new Higgs boson and the cosmological constant must be extremely fine-tuned to produce a universe remotely similar to the one we observe today. Supersymmetry, a hypothetical extension to the current theory, addresses many problems in theoretical and experimental physics including the fine-tuned Higgs mass. In this work, a variant, called Split-Supersymmetry, is investigated; it avoids some problems in standard Supersymmetry while explicitly leaving the Higgs mass fine-tuned. A experimentally unique feature of Split-Supersymmetry is the production of R-hadrons--composite, massive, long-lived, particles. Indeed such long-lived states are predicted in several scenarios of physics beyond the Standard Model, and this search is sensitive to them as well. This dissertation describes the ATLAS searches using 2010, 2011 and 2012 data for gluino and squark R-hadrons which have come to rest within the ATLAS detector, particularly the calorimeter, and decay at some later time to jets or "ttbar" and a neutralino. Candidate decay events are triggered in the empty bunch crossings in order to remove collision backgrounds. Selections based on jet shape and muon-system activity are applied to discriminate events from backgrounds, the largest of which are cosmic and beam-halo muons. In the absence of a excess, limits are placed on the new particle mass as a function of its lifetime, for various neutralino masses and decay types.
Book Synopsis Search for Invisible Decays of the Higgs Boson Produced in Vector-boson Fusion in Final States with Jets and Large Missing Transverse Energy with the ATLAS Detector by : Vincent Kitali
Download or read book Search for Invisible Decays of the Higgs Boson Produced in Vector-boson Fusion in Final States with Jets and Large Missing Transverse Energy with the ATLAS Detector written by Vincent Kitali and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Dark Matter in Invisible Higgs Boson Decays with the ATLAS Detector at the LHC by : Arthur Linß
Download or read book Search for Dark Matter in Invisible Higgs Boson Decays with the ATLAS Detector at the LHC written by Arthur Linß and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Lepton-flavour Violating Decays of the Higgs Boson with the ATLAS Detector by : Katharina Schleicher
Download or read book Search for Lepton-flavour Violating Decays of the Higgs Boson with the ATLAS Detector written by Katharina Schleicher and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 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:
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