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Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Two Bottom Quarks at ATLAS

2016-09-29 Science
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Release : 2016-09-29
Genre : Science
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Book Rating : 18X/5 ( reviews)

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Book Synopsis Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Two Bottom Quarks at ATLAS by : Yangyang Cheng

Download or read book Search for Dark Matter Produced in Association with a Higgs Boson Decaying to Two Bottom Quarks at ATLAS written by Yangyang Cheng. This book was released on 2016-09-29. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports on the search for dark matter in data taken with the ATLAS detector at CERN’s Large Hadron Collider (LHC). The identification of dark matter and the determination of its properties are among the highest priorities in elementary particle physics and cosmology. The most likely candidate, a weakly interacting massive particle, could be produced in the high energy proton-proton collisions at the LHC. The analysis presented here is unique in looking for dark matter produced together with a Higgs boson that decays into its dominant decay mode, a pair of b quarks. If dark matter were seen in this mode, we would learn directly about the production mechanism because of the presence of the Higgs boson. This thesis develops the search technique and presents the most stringent production limit to date.

Search for Dark Matter Production in Association with a Higgs Boson with the ATLAS Detector at the LHC

2019
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Release : 2019
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Book Synopsis Search for Dark Matter Production in Association with a Higgs Boson with the ATLAS Detector at the LHC by : Rainer-Christian Röhrig

Download or read book Search for Dark Matter Production in Association with a Higgs Boson with the ATLAS Detector at the LHC written by Rainer-Christian Röhrig. This book was released on 2019. 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 Production of Dark Matter in Association with a Higgs Boson Decaying to Bb with the ATLAS Detector

2018
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Release : 2018
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Book Synopsis Search for Production of Dark Matter in Association with a Higgs Boson Decaying to Bb with the ATLAS Detector by : Matthew Baca

Download or read book Search for Production of Dark Matter in Association with a Higgs Boson Decaying to Bb with the ATLAS Detector written by Matthew Baca. This book was released on 2018. Available in PDF, EPUB and Kindle. Book excerpt: Using 3.2 fb^-1 of sqrt(s) =13TeV proton-proton data collected in 2015 with the ATLAS detector at the Large Hadron Collider, new limits were imposed on the associated production of Dark Matter with a 125GeV Higgs boson which decays into a pair of b-quarks. The final state of the signal is a pair of b-quark jets and large Missing Transverse Momentum attributed to the DM escaping the detector. The dominant backgrounds were simulated. These were subject to selection requirements to increase signal to background ratio. Three regions were designated based on the number of leptons in the event. 0 lepton events made up the signal region. Events with 1 and 2 leptons were control regions. Similar selection requirements were applied to the control regions as in the signal region, in order to examine a similar phase space. A blinding region was established in the 0 lepton region over the mbb distribution to mask where a reconstructed 125GeV Higgs boson would appear. The control regions and the side bands in the signal region were then fit to the mbb data distribution. Unblinding of the signal region did not result in the discovery of the decay channel, but allowed limits to be imposed.

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.

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