Book/Dissertation / PhD Thesis

PUBDB-2026-00978

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Search for single vector-like quark production in the opposite-sign dilepton final state in proton-proton collisions at $\sqrt{s}=13$ TeV

Wang, D. (Corresponding author)DESY* ; Gallo-Voss, E. (Thesis advisor)DESY* ; Mankel, R. (Thesis advisor)Extern*DESY*

2026
Verlag Deutsches Elektronen-Synchrotron DESY Hamburg

This record in other databases:  

Please use a persistent id in citations: urn:nbn:de:gbv:18-ediss-135917  doi:10.3204/PUBDB-2026-00978

Report No.: DESY-THESIS-2026-006

Abstract: Vector-like quarks are predicted in various scenarios in beyond the Standard Model (SM) theories. This work presents a search for a single vector-like top quark (T) decaying into a top quark and a SM Higgs boson (T!tH), in the T mass range from 600 GeV to 1200 GeV. The data used is from proton-proton collisions collected by the CMS experiment at the LHC in Run 2, corresponding to 138 fb 1 of integrated luminosity. The final state includes two opposite-sign leptons (muons or electrons), jets, and missing transverse momentum. The analysis uses cut-based selection criteria optimized for SM background suppression, along with a mass reconstruction algorithm developed under the neutrino kinematic assumptions. For signal extraction, the main observable is the reconstructed T mass, and the background models are data-driven. No excess in data above the standard model prediction is observed, thus upper limits are set on the production cross section of vector-like top quark times branching ratio. The analysis presents the first results for the opposite-sign dilepton final state, achieving a sensitivity similar to that of other channels with the same target.

Note: Dissertation, Universität Hamburg, 2026

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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)

Experiment(s):

1. LHC: CMS

Appears in the scientific report 2026

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