Search for Heavy ZZ Resonances in the 4l Final State with the ATLAS Detector and Identifying Muons in the ATLAS Calorimeter Using Machine Learning PDF Download
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Author: Ricardo Wolker
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Languages : en
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Author: Ricardo Wolker
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Languages : en
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Author: Marcus Matthias Morgenstern
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Category :
Languages : en
Pages : 255
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Author: Simon Viel
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Category :
Languages : en
Pages :
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Author: Alexander Mann
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Category :
Languages : en
Pages : 0
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Author: Janna Katharina Behr
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Category :
Languages : en
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Author: Alan Kahn
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Category :
Languages : en
Pages : 0
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A search for a heavy new particle Y decaying to a Standard Model Higgs boson H and another new particle X is presented. The search is performed using 139 fb−1 of p−p collision data at √s = 13 TeV recorded by the ATLAS detector. The H boson is identified through its decays to bb, with the only assumption applied to X being that it decays hadronically. The X is identified through a novel anomaly detection method via the use of a Variational Recurrent Neural Network trained directly on data collected by the ATLAS detector. This effort marks the first application of a fully unsupervised machine learning method to an ATLAS analysis. An additional benchmark based on interpreting the Y → XH process in the context of a heavy vector triplet model in which the X decays to two quarks defines an additional signal region in which upper limits on the HVT process cross section are reported at 95% confidence level.
Author: N. P. Readioff
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Category :
Languages : en
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Author: Sing Leung Cheung
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Category :
Languages : en
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ISBN: 9781321224535
Category :
Languages : en
Pages : 144
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This thesis presents a search for resonances in diboson production in the [llqq] final state using Lint = 20.3 fb --1 of proton-proton collision data collected at a center of mass energy of 8 TeV with the ATLAS detector. No significant excess over the Standard Model expectation is observed. Consequently 95% confidence level upper limits are set on the cross section times branching fraction for the production of bulk Randall-Sundrum gravitons and extended gauge model W' bosons, leading to the exclusion of masses below 740 GeV and 1590 GeV, respectively.
Author: Tilman Plehn
Publisher: Springer
ISBN: 3319059424
Category : Science
Languages : en
Pages : 340
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Book Description
With the discovery of the Higgs boson, the LHC experiments have closed the most important gap in our understanding of fundamental interactions, confirming that such interactions between elementary particles can be described by quantum field theory, more specifically by a renormalizable gauge theory. This theory is a priori valid for arbitrarily high energy scales and does not require an ultraviolet completion. Yet, when trying to apply the concrete knowledge of quantum field theory to actual LHC physics - in particular to the Higgs sector and certain regimes of QCD - one inevitably encounters an intricate maze of phenomenological know-how, common lore and other, often historically developed intuitions about what works and what doesn’t. These lectures cover three aspects to help understand LHC results in the Higgs sector and in searches for physics beyond the Standard Model: they discuss the many facets of Higgs physics, which is at the core of this significantly expanded second edition; then QCD, to the degree relevant for LHC measurements; as well as further standard phenomenological background knowledge. They are intended to serve as a brief but sufficiently detailed primer on LHC physics to enable graduate students and all newcomers to the field to find their way through the more advanced literature, and to help those starting to work in this very timely and exciting field of research. Advanced readers will benefit from this course-based text for their own lectures and seminars. .
