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Identification Of Hadronic Tau Decays In Atlas
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Book Synopsis Identification of Hadronic Tau Decays in ATLAS. by :
Download or read book Identification of Hadronic Tau Decays in ATLAS. written by and published by . This book was released on 1998 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Taus can be an important signature for Supersymmetry at the LHC. They can be produced copiously in the decays of supersymmetric particles. Measurement of their momentum and of the tau-tau invariant mass distribution, would provide detailed information regarding the masses of supersymmetric particles. It is demonstrated using full simulation that it will be possible for ATLAS to make a cut on the reconstructed tau invariant mass using information from the tracking and the electromagnetic calorimeter. The measured energy and momentum of tau's that pass this selection can then be used to infer information about the tau-tau invariant mass.
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 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 Identification of Hadronic Tau Decays and Observation Potential of CP-violating Effects in SUSY at ATLAS by : Björn Gosdzik
Download or read book Identification of Hadronic Tau Decays and Observation Potential of CP-violating Effects in SUSY at ATLAS written by Björn Gosdzik and published by . This book was released on 2011 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Hadronic Τ [tau] Decays and Observation Potential of CP-violating Effects in SUSY and ATLAS by : Björn Gosdzik
Download or read book Identification of Hadronic Τ [tau] Decays and Observation Potential of CP-violating Effects in SUSY and ATLAS written by Björn Gosdzik and published by . This book was released on 2011 with total page 179 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Identification of Hadronic _t63 [tau] Decays and Observation Potential of CP-violating Effects in SUSY and ATLAS by : Björn Gosdzik
Download or read book Identification of Hadronic _t63 [tau] Decays and Observation Potential of CP-violating Effects in SUSY and ATLAS written by Björn Gosdzik and published by . This book was released on 2011 with total page 179 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 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 A Search for New Physics in High-mass Ditau Events in the ATLAS Detector by : Ryan Reece
Download or read book A Search for New Physics in High-mass Ditau Events in the ATLAS Detector written by Ryan Reece and published by . This book was released on 2013 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 _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 Identification of Hadronic Tau Lepton Decays Using a Deep Neural Network by : Armen Tumasyan
Download or read book Identification of Hadronic Tau Lepton Decays Using a Deep Neural Network written by Armen Tumasyan and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Using Boosted Decision Trees for Tau Identification in the ATLAS Experiment by : Jennifer Lynn Godfrey
Download or read book Using Boosted Decision Trees for Tau Identification in the ATLAS Experiment written by Jennifer Lynn Godfrey and published by . This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ATLAS detector will begin taking data from P-p collisions in 2009. This experiment will allow for many different physics measurements and searches. The production of tau leptons at the LHC is a key signature of the decay of both the standard model Higgs (via H $\rightarrow \tau \tau$) and SUSY particles. Taus have a short lifetime ($c \tau= 87$ $\mu$m) and decay hadronically 65% of the time. Many QCD interactions produce similar hadronic showers and have cross-sections about 1 billion times larger than tau production. Multivariate techniques are therefore often used to distinguish taus from this background. Boosted Decision Trees (BDTs) are a machine-learning technique for developing cut-based discriminants which can significantly aid in extracting small signal samples from overwhelming backgrounds. In this study, BDTs are used for tau identification for the ATLAS experiment. They are a fast, flexible alternative to existing discriminants with comparable or better performance.
Book Synopsis High Jet Multiplicity Physics at the LHC by : Mireia Crispín Ortuzar
Download or read book High Jet Multiplicity Physics at the LHC written by Mireia Crispín Ortuzar and published by Springer. This book was released on 2016-08-25 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes research in two different areas of state-of-the-art hadron collider physics, both of which are of central importance in the field of particle physics. The first part of the book focuses on the search for supersymmetric particles called gluinos. The book subsequently presents a set of precision measurements of “multi-jet” collision events, which involve large numbers of newly created particles, and are among the dominant processes at the Large Hadron Collider (LHC). Now that a Higgs boson has been discovered at the LHC, the existence (or non-existence) of supersymmetric particles is of the utmost interest and significance, both theoretically and experimentally. In addition, multi-jet collision events are an important background process for a wide range of analyses, including searches for supersymmetry.
Download or read book PASCOS 2004 written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heavy Neutral Particle Decays to Tau Pairs by : Michail Bachtis
Download or read book Heavy Neutral Particle Decays to Tau Pairs written by Michail Bachtis and published by Springer Science & Business Media. This book was released on 2013-12-13 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this thesis spans a wide range of experimental particle physics subjects, starting from level-1 trigger electronics to the final results of the search for Higgs boson decay and to tau lepton pairs. The thesis describes an innovative reconstruction algorithm for tau decays and details how it was instrumental in providing a measurement of Z decay to tau lepton pairs. The reliability of the analysis is fully established by this measurement before the Higgs boson decay to tau lepton pairs is considered. The work described here continues to serve as a model for analysing CMS Higgs to tau leptons measurements.
Book Synopsis Higgs Boson Decays into a Pair of Bottom Quarks by : Cecilia Tosciri
Download or read book Higgs Boson Decays into a Pair of Bottom Quarks written by Cecilia Tosciri and published by Springer Nature. This book was released on 2021-10-22 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery in 2012 of the Higgs boson at the Large Hadron Collider (LHC) represents a milestone for the Standard Model (SM) of particle physics. Most of the SM Higgs production and decay rates have been measured at the LHC with increased precision. However, despite its experimental success, the SM is known to be only an effective manifestation of a more fundamental description of nature. The scientific research at the LHC is strongly focused on extending the SM by searching, directly or indirectly, for indications of New Physics. The extensive physics program requires increasingly advanced computational and algorithmic techniques. In the last decades, Machine Learning (ML) methods have made a prominent appearance in the field of particle physics, and promise to address many challenges faced by the LHC. This thesis presents the analysis that led to the observation of the SM Higgs boson decay into pairs of bottom quarks. The analysis exploits the production of a Higgs boson associated with a vector boson whose signatures enable efficient triggering and powerful background reduction. The main strategy to maximise the signal sensitivity is based on a multivariate approach. The analysis is performed on a dataset corresponding to a luminosity of 79.8/fb collected by the ATLAS experiment during Run-2 at a centre-of-mass energy of 13 TeV. An excess of events over the expected background is found with an observed (expected) significance of 4.9 (4.3) standard deviation. A combination with results from other \Hbb searches provides an observed (expected) significance of 5.4 (5.5). The corresponding ratio between the signal yield and the SM expectation is 1.01 +- 0.12 (stat.)+ 0.16-0.15(syst.). The 'observation' analysis was further extended to provide a finer interpretation of the V H(H → bb) signal measurement. The cross sections for the VH production times the H → bb branching ratio have been measured in exclusive regions of phase space. These measurements are used to search for possible deviations from the SM with an effective field theory approach, based on anomalous couplings of the Higgs boson. The results of the cross-section measurements, as well as the constraining of the operators that affect the couplings of the Higgs boson to the vector boson and the bottom quarks, have been documented and discussed in this thesis. This thesis also describes a novel technique for the fast simulation of the forward calorimeter response, based on similarity search methods. Such techniques constitute a branch of ML and include clustering and indexing methods that enable quick and efficient searches for vectors similar to each other. The new simulation approach provides optimal results in terms of detector resolution response and reduces the computational requirements of a standard particles simulation.
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