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Reconstruction Of Hadronic Decay Products Of Tau Leptons With The Atlas Experiment
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Book Synopsis Reconstruction of Hadronic Decay Products of Tau Leptons with the ATLAS Experiment by :
Download or read book Reconstruction of Hadronic Decay Products of Tau Leptons with the ATLAS Experiment written by and published by . This book was released on 2016 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: This document presents a new method of reconstructing the individual charged and neutral hadrons in tau decays with the ATLAS detector. The reconstructed hadrons are used to classify the decay mode and to calculate the visible four-momentum of reconstructed tau candidates, significantly improving the resolution with respect to the calibration in the existing tau reconstruction. The performance of the reconstruction algorithm is optimised and evaluated using simulation and validated using samples of Z → [tau][tau] and Z(→ [mu][mu])+jets events selected from proton-proton collisions at a centre-of-mass energy √s = 8 TeV, corresponding to an integrated luminosity of 5 fb-1.
Book Synopsis Identification of Hadronic Tau Decays Using the Tau Lepton Flight Path and Reconstruction and Identification of Jets with a Low Transverse Energy at Intermediate Luminosities with an Application to the Search for the Higgs Boson in Vector Boson Fusion with the ATLAS Experiment at the LHC by : Christoph Ruwiedel
Download or read book Identification of Hadronic Tau Decays Using the Tau Lepton Flight Path and Reconstruction and Identification of Jets with a Low Transverse Energy at Intermediate Luminosities with an Application to the Search for the Higgs Boson in Vector Boson Fusion with the ATLAS Experiment at the LHC written by Christoph Ruwiedel and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Hadronic Τ [tau] Decays Using the Τ [tau] Lepton Flight Path and Reconstruction and Identification of Jets with a Low Transverse Energy at Intermediate Luminosities with an Application to the Search for the Higgs Boson in Vector Boson Fusion with the ATLAS Experiment at the LHC by : Christoph Ruwiedel
Download or read book Identification of Hadronic Τ [tau] Decays Using the Τ [tau] Lepton Flight Path and Reconstruction and Identification of Jets with a Low Transverse Energy at Intermediate Luminosities with an Application to the Search for the Higgs Boson in Vector Boson Fusion with the ATLAS Experiment at the LHC written by Christoph Ruwiedel and published by . This book was released on 2010 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Hadronic _t63 [tau] Decays Using the _t63 [tau] Lepton Flight Path and Reconstruction and Identification of Jets with a Low Transverse Energy at Intermediate Luminosities with an Application to the Search for the Higgs Boson in Vector Boson Fusion with the ATLAS Experiment at the LHC by : Christoph Ruwiedel
Download or read book Identification of Hadronic _t63 [tau] Decays Using the _t63 [tau] Lepton Flight Path and Reconstruction and Identification of Jets with a Low Transverse Energy at Intermediate Luminosities with an Application to the Search for the Higgs Boson in Vector Boson Fusion with the ATLAS Experiment at the LHC written by Christoph Ruwiedel and published by . This book was released on 2010 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tau Trigger at the ATLAS Experiment by :
Download or read book Tau Trigger at the ATLAS Experiment written by and published by . This book was released on 2011 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many theoretical models, like the Standard Model or SUSY at large tan([beta]), predict Higgs bosons or new particles which decay more abundantly to final states including tau leptons than to other leptons. At the energy scale of the LHC, the identification of tau leptons, in particular in the hadronic decay mode, will be a challenging task due to an overwhelming QCD background which gives rise to jets of particles that can be hard to distinguish from hadronic tau decays. Equipped with excellent tracking and calorimetry, the ATLAS experiment has developed tau identification tools capable of working at the trigger level. This contribution presents tau trigger algorithms which exploit the main features of hadronic tau decays and describes the current tau trigger commissioning activities. Many of the SM processes being investigated at ATLAS, as well as numerous BSM searches, contain tau leptons in their final states. Being able to trigger effectively on the tau leptons in these events will contribute to the success of the ATLAS experiment. The tau trigger algorithms and monitoring infrastructure are ready for the first data, and are being tested with the data collected with cosmic muons. The development of efficiency measurements methods using QCD and Z → [tau][tau] events is well advanced.
Book Synopsis Reconstruction of Photon Conversions in Tau Lepton Decays in the ATLAS Experiment by : Michael Böhler
Download or read book Reconstruction of Photon Conversions in Tau Lepton Decays in the ATLAS Experiment written by Michael Böhler and published by . This book was released on 2009 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identifying Hadronic Tau Decays Using Calorimeter Topological Clusters at ATLAS by : Michel Trottier-McDonald
Download or read book Identifying Hadronic Tau Decays Using Calorimeter Topological Clusters at ATLAS written by Michel Trottier-McDonald and published by . This book was released on 2010 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ATLAS experiment collects data on the world's highest energy proton-proton collisions. Its primary goals are to search for direct evidence of physics beyond the Standard Model of particle physics, and to provide a final verdict on the existence of the Standard Model Higgs boson. A robust tau identification procedure is an important ingredient in the search for Standard Model and supersymmetric Higgs bosons. In this study, new tau identification variables based on calorimeter topological clusters are investigated. These variables complement existing calorimeter-based variables by bringing additional discriminating power against hadronic jets. They have a straightforward physics interpretation which allows them to be calculated at particle-level. Some of these new variables are shown to be robust against background noise from the underlying event and in-time pileup, two effects which negatively impact tau identification. Several of these new variables are now part of the official tau reconstruction software at ATLAS.
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 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 Tau Lepton Reconstruction with Energy Flow and the Search for R-parity Violating Supersymmetry at the ATLAS Experiment by : Sebastian Fleischmann
Download or read book Tau Lepton Reconstruction with Energy Flow and the Search for R-parity Violating Supersymmetry at the ATLAS Experiment written by Sebastian Fleischmann and published by . This book was released on 2011 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Expected Performance of the ATLAS Experiment by :
Download or read book Expected Performance of the ATLAS Experiment written by and published by . This book was released on 2009 with total page 748 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Beauty and the Boost: A Higgs Boson Tale by : Brian Moser
Download or read book The Beauty and the Boost: A Higgs Boson Tale written by Brian Moser and published by Springer Nature. This book was released on 2023-09-19 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precision measurements of the Higgs boson’s properties are a powerful tool to look for deviations from the predictions of the Standard Model (SM) of particle physics. The 139/fb of proton-proton collision data which have been collected by the ATLAS experiment during Run 2 of the LHC, offer an opportunity to investigate rare Higgs-boson topologies, which are particularly sensitive to new physics scenarios but experimentally difficult to access. Several such measurements, which target Higgs-boson decays to heavy-flavour quarks, as well as their combinations are presented in this thesis. A novel analysis that measures Higgs-boson production in association with a heavy vector boson V (VH, with V=W,Z) at high energies is presented. Dedicated Higgs-boson reconstruction techniques are applied to reconstruct the highly Lorentz-boosted Higgs-boson decays into pairs of bottom quarks. The measurement is subsequently combined with a VH cross-section measurement at low and intermediate pT(V) to provide a differential cross-section measurement in kinematic fiducial volumes over the largest possible pT(V) range. All cross-section measurements agree with the SM predictions within relative uncertainties that range from 30% to 300%. The results are furthermore interpreted as limits on the parameters of a SM effective field theory. Finally, a combination of measurements of Higgs decays to heavy-flavour quarks is used to experimentally determine that the Higgs-boson coupling to charm quarks is weaker than to bottom quarks, as predicted by the SM. The target audience for the thesis are physicists and physics students, in particular those with a background in high energy physics.
Book Synopsis Probing Lepton Flavour Violation Via Neutrinoless [tau]2![mu] Decays with the ATLAS Detector by :
Download or read book Probing Lepton Flavour Violation Via Neutrinoless [tau]2![mu] Decays with the ATLAS Detector written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This article presents the sensitivity of the ATLAS experiment to the lepton-flavour-violating decays of [tau]2![mu]. A method utilising the production of [tau] leptons via W2!tau][nu] decays is used. This method is applied to the sample of 20.3 fb-1 of pp collision data at a centre-of-mass energy of 8 TeV collected by the ATLAS experiment at the LHC in 2012. Lastly, no event is observed passing the selection criteria, and the observed (expected) upper limit on the [tau] lepton branching fraction into three muons, Br([tau]2![mu]), is 3.76×10-7 (3.94×10-7) at 90 % confidence level.
Book Synopsis Standard Model Measurements with the ATLAS Detector by : Jana Nováková
Download or read book Standard Model Measurements with the ATLAS Detector written by Jana Nováková and published by Springer Science & Business Media. This book was released on 2013-08-30 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis deals with two main procedures performed with the ATLAS detector at the Large Hadron Collider (LHC). The noise description in the hadronic calorimeter TileCal represents a very valuable technical job. The second part presents a fruitful physics analysis - the cross section measurement of the process p+p → Z0 → τ + τ. The Monte Carlo simulations of the TileCal are described in the first part of the thesis, including a detailed treatment of the electronic noise and multiple interactions (so-called pile-up). An accurate description of both is crucial for the reconstruction of e.g. jets or hadronic tau-jets. The second part reports a Standard Model measurement of the Z0 → τ + τ process with the emphasis on the final state with an electron and a hadronically decaying tau-lepton. The Z0 → τ + τ channel forms the dominant background in the search for Higgs bosons decaying into tau lepton pairs, and thus the good understanding achieved here can facilitate more sensitive Higgs detection.
Book Synopsis The Identification of Hadronically Decaying Tau Leptons in the ATLAS Experiment and Investigation of the Discovery Potential for MSSM Higgs Bosons in Tau Final States by : Michael Heldmann
Download or read book The Identification of Hadronically Decaying Tau Leptons in the ATLAS Experiment and Investigation of the Discovery Potential for MSSM Higgs Bosons in Tau Final States written by Michael Heldmann and published by . This book was released on 2007 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Discovery Of The Higgs Boson by : Aleandro Nisati
Download or read book Discovery Of The Higgs Boson written by Aleandro Nisati and published by World Scientific. This book was released on 2016-08-26 with total page 470 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent observation of the Higgs boson has been hailed as the scientific discovery of the century and led to the 2013 Nobel Prize in physics. This book describes the detailed science behind the decades-long search for this elusive particle at the Large Electron Positron Collider at CERN and at the Tevatron at Fermilab and its subsequent discovery and characterization at the Large Hadron Collider at CERN. Written by physicists who played leading roles in this epic search and discovery, this book is an authoritative and pedagogical exposition of the portrait of the Higgs boson that has emerged from a large number of experimental measurements. As the first of its kind, this book should be of interest to graduate students and researchers in particle physics.
Book Synopsis Searching for Squarks by : Samuel Jones
Download or read book Searching for Squarks written by Samuel Jones and published by Springer Nature. This book was released on 2020-08-27 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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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