Observation of Standard Model Higgs Boson Decays to Tau Leptons and a Search for Dark Matter with the CMS Detector at the LHC

Observation of Standard Model Higgs Boson Decays to Tau Leptons and a Search for Dark Matter with the CMS Detector at the LHC
Author: Laura Margaret Dodd
Publisher:
Total Pages: 0
Release: 2018
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A search for the standard model (SM) Higgs boson which decays to a pair of [tau] leptons is presented in this thesis using 35.9 f b−1 of 13 TeV data collected in 2016 by the CMS detector at CERN. The final states considered require that (1) one [tau] lepton decays leptonically while the other decays hadronically ([mu][tau]h or e[tau]h), (2) both taus decay hadronically ([tau]h[tau]h) or (3) one tau lepton decays to an electron while the other decays to a muon (e[mu]). This thesis specifically focuses on the details of the semi-hadronic decay channels ([mu][tau]h and e[tau]h), and presents the results of all channels combined. The signal strength, [mu], relative to the expectation for the SM Higgs boson is measured to be [mu] = 1.09+0.27−0.24. An excess is observed (expected) corresponding to 4.9 (4.7) [sigma] using 2016 data. The observed (expected) significance reaches 5.9 (5.9) [sigma] when combined with 7 and 8 TeV data collected at CMS. Subsequently following the SM search, a search for dark matter (DM) is presented and interpreted in two simplified Higgs-portal models: a baryonic dark matter model and a two Higgs-doublet model. In this thesis, the Higgs boson is required to decay to an opposite- sign tau pair. The tau pair final states considered are e[tau]h, [mu][tau]h, and [tau]h[tau]h. The expected 95% confidence level upper limits are produced and compared with the observed limit. No significant deviations beyond the SM prediction are observed.


Observation of Standard Model Higgs Boson Decays to Tau Leptons and a Search for Dark Matter with the CMS Detector at the LHC
Language: en
Pages: 0
Authors: Laura Margaret Dodd
Categories:
Type: BOOK - Published: 2018 - Publisher:

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A search for the standard model (SM) Higgs boson which decays to a pair of [tau] leptons is presented in this thesis using 35.9 f b−1 of 13 TeV data collected
Search for Dark Matter Recoiling from a Higgs Boson, which Decays to Tau Lepton Pairs, with the CMS Detector at the LHC
Language: en
Pages: 0
Authors: Jithin Madhusudanan Sreekala
Categories:
Type: BOOK - Published: 2022 - Publisher:

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This thesis describes search for dark matter particles recoiling from a Higgs boson at the CMS detector at the LHC where the Higgs subsequently decays to two ta
A Collider Search for Dark Matter Produced in Association with a Higgs Boson with the CMS Detector at the 13 TeV LHC
Language: en
Pages:
Authors: Dustin Ray Burns
Categories:
Type: BOOK - Published: 2017 - Publisher:

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The study presented in this dissertation is a search for dark matter produced in 13 TeV proton-proton collisions at the Large Hadron Collider (LHC) using 35.9 f
Measurement of Higgs Boson Production Cross Sections in the Diphoton Channel
Language: en
Pages: 305
Authors: Ahmed Tarek Abouelfadl Mohamed
Categories: Science
Type: BOOK - Published: 2020-11-12 - Publisher: Springer Nature

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This thesis presents the measurement of the Higgs boson cross section in the diphoton decay channel. The measurement relies on proton-proton collision data at a
Particle Physics Reference Library
Language: en
Pages: 632
Authors: Herwig Schopper
Categories: Heavy ions
Type: BOOK - Published: 2020 - Publisher: Springer Nature

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This first open access volume of the handbook series contains articles on the standard model of particle physics, both from the theoretical and experimental per