Book/Dissertation / PhD Thesis

PUBDB-2021-03020

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Search for high-mass bosons of an extended Higgs sector in b quark final states using the 2017 data set of the CMS experiment

Asmuss, J. P. (Corresponding author)DESY* ; Mankel, R. (Thesis advisor)DESY* ; Gallo-Voss, E. (Thesis advisor)DESY*

2021
Verlag Deutsches Elektronen-Synchrotron DESY Hamburg

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Please use a persistent id in citations: urn:nbn:de:gbv:18-ediss-94102  doi:10.3204/PUBDB-2021-03020

Report No.: DESY-THESIS-2021-012

Abstract: A search for heavy, neutral Higgs bosons produced in association with b quarks and decaying into a pair of b quarks is presented. It is based on LHC Run 2 data, produced at a center-of-mass energy of 13 TeV in pp collisions and collected by the CMS experiment in 2017, corresponding to an integrated luminosity of 36.02/fb.Several theories beyond the Standard Model predict additional Higgs bosons and, dependingon the specific model, the coupling to b quarks can be significantly enlarged. This is for examplethe case in the minimal supersymmetric extension of the Standard Model (MSSM) and in thetype-II and flipped scenarios of the general Two-Higgs-Doublet Model (2HDM).A dedicated trigger is utilized to select the events for this analysis. At least three highlyenergetic jets are required in the final state. Out of these, the two jets with the largest energycontributions are selected as candidates for the Higgs boson decay and the third one is originatingfrom an associated b quark. The invariant mass of the leading two jets is therefore the mainobservable in this analysis and Higgs boson masses from 300 to 1600 GeV are investigated. Toavoid overlap with the complementary semi-leptonic analysis, no muon is required to be presentwithin any final-state jet, leading to an all-hadronic signature.The dominant background contribution consists of heavy-flavor QCD-multi-jet events and isestimated based on a fully data-driven approach.No significant deviation from the background-only prediction of the Standard Model is observed. Therefore, limits on the production cross-section times branching fraction of the signal process are calculated. These limits are translated into the parameter space of several specific models, namely the (mA, tan beta) plane for MSSM benchmark scenarios and the (cos(beta − alpha), mA, tan beta) parameter space of 2HDM models.

Note: Dissertation, Universität Hamburg, 2021

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Contributing Institute(s):

1. LHC/CMS Experiment (CMS)

Research Program(s):

1. 611 - Fundamental Particles and Forces (POF4-611) (POF4-611)
2. PHGS, VH-GS-500 - PIER Helmholtz Graduate School (2015_IFV-VH-GS-500) (2015_IFV-VH-GS-500)

Experiment(s):

1. LHC: CMS

Appears in the scientific report 2021

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Database coverage:
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