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Search for Dark Matter with ATLAS

2016-06-29 Science
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Release : 2016-06-29
Genre : Science
Kind : eBook
Book Rating : 458/5 ( reviews)

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Book Synopsis Search for Dark Matter with ATLAS by : Ruth Pöttgen

Download or read book Search for Dark Matter with ATLAS written by Ruth Pöttgen. This book was released on 2016-06-29. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes in detail a search for weakly interacting massive particles as possible dark matter candidates, making use of so-called mono-jet events. It includes a detailed description of the run-1 system, important operational challenges, and the upgrade for run-2. The nature of dark matter, which accounts for roughly 25% of the energy-matter content of the universe, is one of the biggest open questions in fundamental science. The analysis is based on the full set of proton-proton collisions collected by the ATLAS experiment at the Large Hadron Collider at √s = 8 TeV. Special attention is given to the experimental challenges and analysis techniques, as well as the overall scientific context beyond particle physics. The results complement those of non-collider experiments and yield some of the strongest exclusion bounds on parameters of dark matter models by the end of the Large Hadron Collider run-1. Details of the upgrade of the ATLAS Central Trigger for run-2 are also included.

Searching for Dark Matter with the ATLAS Detector in Events with an Energetic Jet and Large Missing Transverse Momentum

2015 Physics Theses
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Release : 2015
Genre : Physics Theses
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Book Synopsis Searching for Dark Matter with the ATLAS Detector in Events with an Energetic Jet and Large Missing Transverse Momentum by : Steven Schramm

Download or read book Searching for Dark Matter with the ATLAS Detector in Events with an Energetic Jet and Large Missing Transverse Momentum written by Steven Schramm. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt:

Searching for Dark Matter with the ATLAS Detector

2016-11-23 Science
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Release : 2016-11-23
Genre : Science
Kind : eBook
Book Rating : 530/5 ( reviews)

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Book Synopsis Searching for Dark Matter with the ATLAS Detector by : Steven Schramm

Download or read book Searching for Dark Matter with the ATLAS Detector written by Steven Schramm. This book was released on 2016-11-23. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the search for Dark Matter at the LHC in the mono-jet plus missing transverse momentum final state, using the full dataset recorded in 2012 by the ATLAS Experiment. It is the first time that the number of jets is not explicitly restricted to one or two, thus increasing the sensitivity to new signals. Instead, a balance between the most energetic jet and the missing transverse momentum is required, thus selecting mono-jet-like final states. Collider searches for Dark Matter have typically used signal models employing effective field theories (EFTs), even when comparing to results from direct and indirect detection experiments, where the difference in energy scale renders many such comparisons invalid. The thesis features the first robust and comprehensive treatment of the validity of EFTs in collider searches, and provides a means by which the different classifications of Dark Matter experiments can be compared on a sound and fair basis.

Search for Dark Matter with the ATLAS Detector

2018-08-01 Science
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Release : 2018-08-01
Genre : Science
Kind : eBook
Book Rating : 169/5 ( reviews)

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Book Synopsis Search for Dark Matter with the ATLAS Detector by : Johanna Gramling

Download or read book Search for Dark Matter with the ATLAS Detector written by Johanna Gramling. This book was released on 2018-08-01. Available in PDF, EPUB and Kindle. Book excerpt: This book discusses searches for Dark Matter at the CERN’s LHC, the world’s most powerful accelerator. It introduces the relevant theoretical framework and includes an in-depth discussion of the Effective Field Theory approach to Dark Matter production and its validity, as well as an overview of the formalism of Simplified Dark Matter models. Despite overwhelming astrophysical evidence for Dark Matter and numerous experimental efforts to detect it, the nature of Dark Matter still remains a mystery and has become one of the hottest research topics in fundamental physics. Two searches for Dark Matter are presented, performed on data collected with the ATLAS experiment. They analyze missing-energy final states with a jet or with top quarks. The analyses are explained in detail, and the outcomes and their interpretations are discussed, also in view of the precedent analysis of theoretical approaches. Given its depth of coverage, the book represents an excellent reference guide for all physicists interested in understanding the theoretical and experimental considerations relevant to Dark Matter searches at the LHC.

Search for Dark Matter in Events with Heavy Quarks and Missing Transverse Momentum in Pp Collisions with the ATLAS Detector

2015
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Release : 2015
Genre :
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Book Synopsis Search for Dark Matter in Events with Heavy Quarks and Missing Transverse Momentum in Pp Collisions with the ATLAS Detector by :

Download or read book Search for Dark Matter in Events with Heavy Quarks and Missing Transverse Momentum in Pp Collisions with the ATLAS Detector written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: This article reports on a search for dark matter pair production in association with bottom or top quarks in 20.3 fb-1 of pp collisions collected at √s=8 TeV by the ATLAS detector at the LHC. Events with large missing transverse momentum are selected when produced in association with high-momentum jets of which one or more are identified as jets containing b-quarks. Final states with top quarks are selected by requiring a high jet multiplicity and in some cases a single lepton. The data are found to be consistent with the Standard Model expectations and limits are set on the mass scale of effective field theories that describe scalar and tensor interactions between dark matter and Standard Model particles. Limits on the dark-matter-nucleon cross-section for spin-independent and spin-dependent interactions are also provided. These limits are particularly strong for low-mass dark matter. Using a simplified model, constraints are set on the mass of dark matter and of a colored mediator suitable to explain a possible signal of annihilating dark matter.

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