With PQDT Open, you can read the full text of open access dissertations and theses free of charge.
About PQDT Open
Search
COMING SOON! PQDT Open is getting a new home!
ProQuest Open Access Dissertations & Theses will remain freely available as part of a new and enhanced search experience at www.proquest.com.
Questions? Please refer to this FAQ.
A search for a light pseudoscalar Higgs boson ($\mathrm{a}$) is performed using the 2016 Large Hadron Collider (LHC) proton-proton collision data corresponding to an integrated luminosity of 35.9 fb-1 collected at √s = 13TeV by the CMS experiment. The search looks for gg ⟶ H and qq ⟶ qqH with H ⟶aa ⟶ μμττ, where H can be the 125 GeV state or a heavier one. Due to the large mass difference between the H and the a and lightness of the a decay products, the two pairs of μ and τ are highly boosted and collimated. A dedicated di-tau reconstruction technique is devised to increase the efficiency with respect to standard tau reconstruction algorithms. In the absence of a significant signal, model-independent limits are set at 95% C.L. on the branching fraction for H ⟶ aa ⟶ μμττ as a function of ma in the range 3.6 < ma < 21 GeV$, down to 1.5 x 10-4}$ for mH = 125 GeV, 2.0 x 10-4 for mH = 300 GeV, and 1.2 x 10-3 for mH = 750 GeV. Model-dependent limits are set within the context of two Higgs boson doublet plus singlet models, with the most stringent results obtained for Type-III models. These results are complementary to current LHC limits for heavier ma that lead to resolved final-state leptons.
Advisor: | Chertok, Maxwell |
Commitee: | Conway, John, Erbacher, Robin |
School: | University of California, Davis |
Department: | Physics |
School Location: | United States -- California |
Source: | DAI-B 81/3(E), Dissertation Abstracts International |
Source Type: | DISSERTATION |
Subjects: | Particle physics, Quantum physics |
Keywords: | |
Publication Number: | 13865343 |
ISBN: | 9781088330135 |