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Studies Into Tau Reconstruction Missing Transverse Energy And Photon Induced Processes With The Atlas Detector At The Lhc
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Book Synopsis Studies Into Tau Reconstruction, Missing Transverse Energy and Photon Induced Processes with the ATLAS Detector at the LHC by : Robindra P. Prabhu
Download or read book Studies Into Tau Reconstruction, Missing Transverse Energy and Photon Induced Processes with the ATLAS Detector at the LHC written by Robindra P. Prabhu and published by . This book was released on 2011 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Development of Missing Transverse Momentum Reconstruction with the ATLAS Detector Using the PUfit Algorithm in Pp Collisions at 13 TeV. by : Zhelun Li
Download or read book The Development of Missing Transverse Momentum Reconstruction with the ATLAS Detector Using the PUfit Algorithm in Pp Collisions at 13 TeV. written by Zhelun Li and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Many interesting physical processes produce non-interacting particles that could only be measured using the missing transverse momentum. The increase of the proton beam intensity in the Large Hadron Collider (LHC) provides sensitivity to rare physics processes while inevitably increasing the number of simultaneous proton collisions in each event. The missing transverse momentum (MET) is a variable of great interest, defined as the negative sum of the transverse momentum of all visible particles. The precision of the MET determination deteriorates as the complexity of the recorded data escalates. Given the current complexity of data analysis, a new algorithm is developed to effectively determine the MET. Several well-understood physics processes were used to test the effectiveness of the newly designed algorithm. The performance of the new algorithm is also compared to that of the standard algorithm used in the ATLAS experiment.
Book Synopsis Search for Diphoton Events with Missing Transverse Energy with the ATLAS Detector at the LHC by : Andrea Michelle Bangert
Download or read book Search for Diphoton Events with Missing Transverse Energy with the ATLAS Detector at the LHC written by Andrea Michelle Bangert and published by . This book was released on 2011 with total page 336 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 Atlas: A 25-year Insider Story Of The Lhc Experiment by : Peter Jenni
Download or read book Atlas: A 25-year Insider Story Of The Lhc Experiment written by Peter Jenni and published by World Scientific. This book was released on 2019-05-21 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is written by the ATLAS Collaboration at CERN's Large Hadron Collider (LHC), to document and reflect on its more than 25 years of history. It covers all aspects of this global science project at the forefront of particle physics. The historical part recalls first the early stages of discussions in the community leading to the formation of the collaboration in 1992. In a unique approach, the second part documents the evolution from early detector concepts to the final instrument, covering the technical, financial and human aspects. This includes the phases of construction of detector components in the various institutes around the world as well as their installation and commissioning in the underground cavern at CERN.An important part is devoted to the operation of the whole experiment. The book highlights the capabilities and physics accomplishments so far, including the Higgs boson discovery (jointly announced with CMS). It features the various aspects of a broad spectrum of activities needed to arrive at the physics results. The book includes also an outlook to the detector upgrade activities preparing the experiment for the high-luminosity LHC phase of the next decades. Last but not least, it reveals the human aspects of the large ATLAS community working together pursuing common physics goals.The book is aimed at a broad readership with interest in large science projects and their history, as well as in the human endeavour of a worldwide collaboration.
Book Synopsis Z →[tau]h[tau] Cross Section Measurement and [tautau] Mass Reconstruction with the ATLAS Detector at the LHC by :
Download or read book Z →[tau]h[tau] Cross Section Measurement and [tautau] Mass Reconstruction with the ATLAS Detector at the LHC written by and published by . This book was released on 2012 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, the Z to tautau decay where one tau decays leptonically and the other one hadronically is presented. The process is studied with data collected from the ATLAS experiment in pp collisions at c-m-s = 7 TeV at the Large Hadron Collider (LHC). A first observation of the process and an initial measurement of its cross section is done with 36 pb-1 of data recorded during the 2010 run. The measured cross section value in the mass region 66-116~GeV is 857.6 +- 84.3(stat) +- 124.7(syst) +- 29.2(lumi) +- 2.8(theo) pb for the muon channel and 1142 +- 138.6(stat) +- 197.7(syst) +- 3...
Book Synopsis Search for New Physics in Events with Same Sign Leptons and Missing Energy with ATLAS at LHC by : Otilia-Anamaria Ducu
Download or read book Search for New Physics in Events with Same Sign Leptons and Missing Energy with ATLAS at LHC written by Otilia-Anamaria Ducu and published by . This book was released on 2015 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: For the presented studies only the data recorded with the ATLAS detector is analyzed. The theoretical framework, the LHC collider and the ATLAS experiment are given in the first part of this thesis.At hadron colliders, the lepton identification and reconstruction are crucial for precise SM cross sections and coupling measurements or for new physics searches. Therefore, the second part of my thesis is dedicated to performance studies : in-situ measurements of electron identification and reconstruction efficiencies. The search for new physics is presented in the third part of the thesis. For these studies the channel with two same~- sign leptons and missing transverse energy is considered. The results are obtained with $L$~=~20 fb$^{-1}$ of data recorded at $sqrt s$ = 8 TeV and with the very first data at $sqrt s$ = 13 TeV. At the end of Run-1 no significant excess in data over the Standard Model prediction is observed and stringent limits on the supersymmetric particle masses are set. With the two same - sign leptons and jets final state it is also possible to measure directly the top quark Yukawa coupling using the ttbar + $H$ channel. This coupling is the largest in the Standard Model and it connects two of the heaviest particles predicted by the Standard Model, the top quark and the Higgs boson. In the fourth part of this thesis, a complete optimization is performed to reach the highest sensitivity for this signal in the two same~- sign leptons channel at $sqrt s$ = 13 TeV with 100 fb$^{-1}$ of data, corresponding to the end of Run-2.
Book Synopsis Search for New Physics in Mono-jet Final States in pp Collisions by : Giuliano Gustavino
Download or read book Search for New Physics in Mono-jet Final States in pp Collisions written by Giuliano Gustavino and published by Springer. This book was released on 2017-06-19 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis provides a detailed and comprehensive description of the search for New Physics at the Large Hadron Collider (LHC) in the mono-jet final state, using the first 3.2 fb-1 of data collected at the centre of mass energy of colliding protons of 13~TeV recorded in the ATLAS experiment at LHC. The results are interpreted as limits in different theoretical contexts such as compressed supersymmetric models, theories that foresee extra-spatial dimensions and in the dark matter scenario. In the latter the limits are then compared with those obtained by other ATLAS analyses and by experiments based on completely different experimental techniques, highlighting the role of the mono-jet results in the context of dark matter searches.Lastly, a set of possible analysis improvements are proposed to reduce the main uncertainties that affect the signal region and to increase the discovery potential by further exploiting the information on the final state.
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 Search for New Phenomena in a Mono-jet Plus Missing Transverse Energy Final State with the ATLAS Detector at the LHC by : Sahill Poddar
Download or read book Search for New Phenomena in a Mono-jet Plus Missing Transverse Energy Final State with the ATLAS Detector at the LHC written by Sahill Poddar and published by . This book was released on 2013 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particle Physics Reference Library by : Christian W. Fabjan
Download or read book Particle Physics Reference Library written by Christian W. Fabjan and published by Springer Nature. This book was released on 2020 with total page 1083 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second open access volume of the handbook series deals with detectors, large experimental facilities and data handling, both for accelerator and non-accelerator based experiments. It also covers applications in medicine and life sciences. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
Book Synopsis Search for new physics in diphoton and missing transverse energy final states using the ATLAS detector at the LHC by : Martin Wildt
Download or read book Search for new physics in diphoton and missing transverse energy final states using the ATLAS detector at the LHC written by Martin Wildt and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search For Universal Extra Dimensions in the Two Photon and Missing Transverse Energy Final State With The ATLAS Detector by : Baharak Fatholahzadeh
Download or read book Search For Universal Extra Dimensions in the Two Photon and Missing Transverse Energy Final State With The ATLAS Detector written by Baharak Fatholahzadeh and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for New Physics in Pp Collisions in Final States with Tau Leptons, B-jets and Missing Transverse Momentum with the ATLAS Detector in LHC Run 2 by : Ferdinand Krieter
Download or read book Search for New Physics in Pp Collisions in Final States with Tau Leptons, B-jets and Missing Transverse Momentum with the ATLAS Detector in LHC Run 2 written by Ferdinand Krieter and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Leaving No Matter Unturned by : Martin Habedank
Download or read book Leaving No Matter Unturned written by Martin Habedank and published by . This book was released on 2023* with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Englische Version: Various astrophysical observations point towards an as-of-yet unexplained, mainly gravitationally interacting type of matter. If this matter, called Dark Matter, is an elementary particle, it could be produced in particle collisions at the Large Hadron Collider. Given its weak interaction with ordinary matter, however, it would not be directly observable with the general-purpose detectors at the Large Hadron Collider. Its production would therefore manifest as events in which detector-visible objects recoil against the detector-invisible Dark Matter, giving rise to missing transverse energy. This thesis focuses on final states in which these visible objects are jets. A measurement of the final state of large missing transverse energy and at least one jet in 139/fb of proton-proton collisions at 13 TeV recorded with the ATLAS detector at the Large Hadron Collider is performed in this thesis. Good agreement between measured data and Standard-Model prediction is found in a statistical fit. The measurement is corrected for detector effects to facilitate later reinterpretation. Measurements prepared in such a way can, for example, be exploited by the Contur toolkit to set constraints on new theories. Both, the results of the measurement and the Contur toolkit making use of existing measurements at the Large Hadron Collider, are employed to set exclusion limits on a model able to explain Dark Matter, the two-Higgs-doublet model with a pseudoscalar mediator to Dark Matter.
Book Synopsis A Study of Missing Transverse Energy in Minimum Bias Events with In-time Pile-up at the Large Hadron Collider Using the ATLAS Detector and S by : Kuhan Wang
Download or read book A Study of Missing Transverse Energy in Minimum Bias Events with In-time Pile-up at the Large Hadron Collider Using the ATLAS Detector and S written by Kuhan Wang and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A sample of? L dt = 3.67 pb{-1} of minimum bias events observed using the ATLAS detector at the Large Hadron Collider at s=7 TeV is analyzed for Missing Transverse Energy (MET) response in the presence of in-time pile-up. We find that the MET resolution (ox, y) is consistent with a simple model of the detector response for minimum bias events, scaling with respect to the sum of the scalar energy ($\sum E_\text{T}$) as $\sigma_\text{X, Y}=A\sqrt{\sum E_\text{T} }$. This behavior is observed in the presence of in-time pile-up and does not vary with global calibration schemes. We find a bias in the mean ($\mu_\text{X, Y}$) of the MET that is linear with respect to $\sum E_\text{T}$, leading to an asymmetry in the $\phi_\text{X, Y}$ distribution of the MET. We propose an explanation for this problem in terms of a misalignment of the nominal center of the ATLAS detector with respect to its real center. We contrast the data with a Monte Carlo sample produced using PYTHIA. We find that the resolution, bias and asymmetry are all approximately reproduced in simulation.
Book Synopsis A Study of Tau Identification with the CMS Detector at the LHC by : Philip James Ilten
Download or read book A Study of Tau Identification with the CMS Detector at the LHC written by Philip James Ilten and published by . This book was released on 2008 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis I explore the identification of [tau] leptons from simulated reconstructed data that will be collected by the Compact Muon Solenoid (CMS) detector on the Large Hadron Collider (LHC) at CERN. The two components of particle identification, efficiencies of [tau] identification from generator level information, along with fake rates of the current default algorithm have been determined and analyzed for a photon plus jets background sample and QCD background sample. I propose a new [tau] lepton identification algorithm that employs a signal cone parametrized with respect to the 7 transverse energy, and an isolation cone parametrized with respect to charged particle density surrounding the [tau] jet. Using the default algorithm an efficiency of 27.7% is achieved along with a photon plus jets fake rate of 1.96%. Using the proposed algorithm and matching the efficiency of the default algorithm, an efficiency of 26.9% and a fake rate of 0.44% is achieved. Approximately matching fake rates, an efficiency of 37.4% is achieved with a fake rate of 2.36%.
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