Search For Associated Production Of A Z Boson With An Invisibly Decaying Higgs Boson Or Dark Matter Candidates At Square Roots
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Author | : [Study Group] ATLAS Collaboration CERN |
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Total Pages | : 0 |
Release | : 2022 |
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Download Search for Associated Production of a Z Boson with an Invisibly Decaying Higgs Boson Or Dark Matter Candidates at [square Root]s Book in PDF, Epub and Kindle
Abstract: A search for invisible decays of the Higgs boson as well as searches for dark matter candidates, produced together with a leptonically decaying Z boson, are presented. The analysis is performed using proton−proton collisions at a centre-of-mass energy of 13 TeV, delivered by the LHC, corresponding to an integrated luminosity of 139 and recorded by the ATLAS experiment. Assuming Standard Model cross-sections for ZH production, the observed (expected) upper limit on the branching ratio of the Higgs boson to invisible particles is found to be 19% (19%) at the 95% confidence level. Exclusion limits are also set for simplified dark matter models and two-Higgs-doublet models with an additional pseudoscalar mediator
Author | : Eloisa Arena |
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Total Pages | : 0 |
Release | : 2023 |
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Download Search for Associated Production of a Z Boson with an Invisibly Decaying Higgs Boson Or Dark Matter Candidates with the ATLAS Detector Using Full Run-II Data at LHC. Book in PDF, Epub and Kindle
Author | : Matthew Baca |
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Total Pages | : 0 |
Release | : 2018 |
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Download Search for Production of Dark Matter in Association with a Higgs Boson Decaying to Bb with the ATLAS Detector Book in PDF, Epub and Kindle
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.
Author | : William Balunas |
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Total Pages | : 0 |
Release | : 2018 |
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Download A Search for Nothing Book in PDF, Epub and Kindle
This thesis presents a search for invisible decays of the Higgs boson using the vector boson fusion channel. This uses 36 fb-1 of proton-proton collision data at [square root] s = 13 TeV using the ATLAS detector at the Large Hadron Collider. The experimental methods for understanding the signal and background processes as well as detector effects are described in detail. The search is carried out in several regions defined by kinematic requirements on the final-state objects, and the observed event yields are used in a profile-likelihood fit in order to constrain the backgrounds. The results are interpreted using a modified frequentist method and are found to be consistent with the Standard Model expectations. An upper limit of 34% (28% expected) at 95% C.L. is placed on the invisible branching ratio of the Higgs boson. Re-interpretation of these results in terms of dark matter is also discussed, in the context of the Higgs portal and other simplified models.
Author | : ATLAS Collaboration CERN |
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Total Pages | : 0 |
Release | : 2021 |
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Download Search for Dark Matter Produced in Association with a Standard Model Higgs Boson Decaying Into B-quarks Using the Full Run 2 Dataset from the ATLAS Detector Book in PDF, Epub and Kindle
Author | : Pablo Andres Rivadeneira Bracho |
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Total Pages | : 0 |
Release | : 2022 |
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Download Search for Invisible Decays of the Higgs Boson Produced Via Vector Boson Fusion at the ATLAS Detector with 139 Fb-1 of Integrated Luminosity Book in PDF, Epub and Kindle
Author | : Vincent Kitali |
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Release | : 2019 |
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Download Search for Invisible Decays of the Higgs Boson Produced in Vector-boson Fusion in Final States with Jets and Large Missing Transverse Energy with the ATLAS Detector Book in PDF, Epub and Kindle
Author | : Pablo Andres Rivadeneira Bracho |
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Total Pages | : 0 |
Release | : 2022 |
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Download Search for Invisible Decays of the Higgs Boson Produced Via Vector Boson Fusion at the ATLAS Detector with 139 Fb-1 of Integrated Luminosity Book in PDF, Epub and Kindle
Author | : Robert S. White |
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Total Pages | : 0 |
Release | : 2023 |
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Download Dark Matter Searches in Invisible Higgs Boson Decays with the CMS Experiment Book in PDF, Epub and Kindle
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Author | : Fabrizio Napolitano |
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Total Pages | : 0 |
Release | : 2020* |
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Download Search for Dark Matter Produced in Association with a Hypothetical Dark Higgs Boson Decaying to W ± W ∓ Or ZZ Boson Pairs in the Fully Hadronic Final State at √s Book in PDF, Epub and Kindle