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Searches for invisibly decaying Higgs bosons produced through vector boson fusion at 13 TeV and cloud computing for high energy physics with the Compact Muon Solenoid experiment

Searches for invisible decays of the Higgs boson, produced via vector boson fusion, are presented in this thesis. Data from proton-proton collisions at $\sqrt{s}=13~\text{TeV}$, collected with the CMS detector during 2016 and corresponding to an integrated luminosity of $35.9~\text{fb}^{-1}$, are us...

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Autor principal: Di Maria, Riccardo
Lenguaje:eng
Publicado: 2019
Materias:
Acceso en línea:http://cds.cern.ch/record/2690018
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author Di Maria, Riccardo
author_facet Di Maria, Riccardo
author_sort Di Maria, Riccardo
collection CERN
description Searches for invisible decays of the Higgs boson, produced via vector boson fusion, are presented in this thesis. Data from proton-proton collisions at $\sqrt{s}=13~\text{TeV}$, collected with the CMS detector during 2016 and corresponding to an integrated luminosity of $35.9~\text{fb}^{-1}$, are used. The data are in agreement with the standard model prediction, and the observed (expected) upper limits on the invisibly decaying Higgs boson branching ratio $\mathcal{B}(\text{H}\rightarrow \text{inv.})$ are $0.58(0.30)$ and $0.33(0.25)$ at $95\%$ CL for the `cut-based' and `shape-based' approaches, respectively. Several combinations with other relevant analyses are performed using data from Run-1, Run-2 (2015), and 2016 to further improve the sensitivity to $\mathcal{B}(\text{H}\rightarrow \text{inv.})$. The observed (expected) upper limit on $\mathcal{B}(\text{H}\rightarrow \text{inv.})$ is set at $0.19(0.15)$ at $95\%$ CL from the combination performed with all datasets, and it is the most stringent limit to date. Interpretations of the result under non-SM production assumptions and Higgs-portal models are also provided. The observed (expected) $95\%$ CL upper limit on $\frac{\sigma}{\sigma_\text{SM}}\times\mathcal{B}(\text{H}\rightarrow \text{inv.})$ varies in the range $[0.14,0.24]([0.11,0.19])$, assuming non-SM production cross-sections. The observed $90\%$ CL upper limit of $\mathcal{B}(\text{H}\rightarrow \text{inv.})< 0.16$ is translated into an upper limit on the spin-independent DM-nucleon elastic scattering cross-section. This limit is the most stringent constraint for $m_{\chi}<18~\text{GeV}$ or $<7~\text{GeV}$ assuming a fermion or a scalar DM candidate, respectively. R&D computing activities within the Computing & Offline Project at CMS are presented in this thesis. The results from the pioneering implementation of the dynamic on demand analysis service (DODAS) of CMS in different cloud environments and the benchmarking of high energy physics use-cases are an important milestone in CMS. The feasibility studies for the integration of production workflows are some examples to which the work in this thesis significantly contributes. Moreover, the exploitation of cloud resources from UK's Amazon Web Services demonstrates the full exportability of DODAS, which thus provisions on-demand resources in the Grid without any constraint on their physical location.
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spelling cern-26900182020-03-03T15:03:42Zhttp://cds.cern.ch/record/2690018engDi Maria, RiccardoSearches for invisibly decaying Higgs bosons produced through vector boson fusion at 13 TeV and cloud computing for high energy physics with the Compact Muon Solenoid experimentParticle Physics - ExperimentComputing and ComputersSearches for invisible decays of the Higgs boson, produced via vector boson fusion, are presented in this thesis. Data from proton-proton collisions at $\sqrt{s}=13~\text{TeV}$, collected with the CMS detector during 2016 and corresponding to an integrated luminosity of $35.9~\text{fb}^{-1}$, are used. The data are in agreement with the standard model prediction, and the observed (expected) upper limits on the invisibly decaying Higgs boson branching ratio $\mathcal{B}(\text{H}\rightarrow \text{inv.})$ are $0.58(0.30)$ and $0.33(0.25)$ at $95\%$ CL for the `cut-based' and `shape-based' approaches, respectively. Several combinations with other relevant analyses are performed using data from Run-1, Run-2 (2015), and 2016 to further improve the sensitivity to $\mathcal{B}(\text{H}\rightarrow \text{inv.})$. The observed (expected) upper limit on $\mathcal{B}(\text{H}\rightarrow \text{inv.})$ is set at $0.19(0.15)$ at $95\%$ CL from the combination performed with all datasets, and it is the most stringent limit to date. Interpretations of the result under non-SM production assumptions and Higgs-portal models are also provided. The observed (expected) $95\%$ CL upper limit on $\frac{\sigma}{\sigma_\text{SM}}\times\mathcal{B}(\text{H}\rightarrow \text{inv.})$ varies in the range $[0.14,0.24]([0.11,0.19])$, assuming non-SM production cross-sections. The observed $90\%$ CL upper limit of $\mathcal{B}(\text{H}\rightarrow \text{inv.})< 0.16$ is translated into an upper limit on the spin-independent DM-nucleon elastic scattering cross-section. This limit is the most stringent constraint for $m_{\chi}<18~\text{GeV}$ or $<7~\text{GeV}$ assuming a fermion or a scalar DM candidate, respectively. R&D computing activities within the Computing & Offline Project at CMS are presented in this thesis. The results from the pioneering implementation of the dynamic on demand analysis service (DODAS) of CMS in different cloud environments and the benchmarking of high energy physics use-cases are an important milestone in CMS. The feasibility studies for the integration of production workflows are some examples to which the work in this thesis significantly contributes. Moreover, the exploitation of cloud resources from UK's Amazon Web Services demonstrates the full exportability of DODAS, which thus provisions on-demand resources in the Grid without any constraint on their physical location.CERN-THESIS-2019-124oai:cds.cern.ch:26900182019-09-18T13:12:06Z
spellingShingle Particle Physics - Experiment
Computing and Computers
Di Maria, Riccardo
Searches for invisibly decaying Higgs bosons produced through vector boson fusion at 13 TeV and cloud computing for high energy physics with the Compact Muon Solenoid experiment
title Searches for invisibly decaying Higgs bosons produced through vector boson fusion at 13 TeV and cloud computing for high energy physics with the Compact Muon Solenoid experiment
title_full Searches for invisibly decaying Higgs bosons produced through vector boson fusion at 13 TeV and cloud computing for high energy physics with the Compact Muon Solenoid experiment
title_fullStr Searches for invisibly decaying Higgs bosons produced through vector boson fusion at 13 TeV and cloud computing for high energy physics with the Compact Muon Solenoid experiment
title_full_unstemmed Searches for invisibly decaying Higgs bosons produced through vector boson fusion at 13 TeV and cloud computing for high energy physics with the Compact Muon Solenoid experiment
title_short Searches for invisibly decaying Higgs bosons produced through vector boson fusion at 13 TeV and cloud computing for high energy physics with the Compact Muon Solenoid experiment
title_sort searches for invisibly decaying higgs bosons produced through vector boson fusion at 13 tev and cloud computing for high energy physics with the compact muon solenoid experiment
topic Particle Physics - Experiment
Computing and Computers
url http://cds.cern.ch/record/2690018
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