Exploring new physics below and above the electroweak scale

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2022-9-1
Akyumuk, Esra
There are new physics scenarios which are intended to modify the Standard Model either at low or high energy scales. The interaction of a so-called hidden sector with the Standard Model through various portals can be visualized at low energies, which can be explored by using the data from fixed target experiments, beam dumped experiments etc. Vector portal is one venue to explore the hidden sector through coupling with the Standard Model. One way to visualize vector portal effects would be neutrino charge radius. Furthermore, recent successful measurement of the coherent neutrino nucleus cross section could also be sensitive to the electromagnetic form factors of neutrino. Therefore, together with the vector portal contribution to the neutrino electromagnetic form factors, specifically, the magnetic moment and charge radius of neutrino will be discussed. On the other hand, new physics has been traditionally investigated in the framework of various scenarios at high energies beyond the validity of the Standard Model. One such scenario would be the so-called Fat-brane Universal Extra Dimension Model whose signals can be tested at the Large Hadron Collider (LHC). The colored level-1 KK (Kaluza-Klein) particles can be pair-produced at the LHC. From the cascade decays of these particles, dijet plus missing transverse energy signal and photonic signal topologies can be expected. The ATLAS Collaboration recently has reported two searches at 13 TeV center-of-mass energy and 139 inverse femtobarn integrated luminosity data; multi-jet plus missing transverse energy and photon-j plus missing transverse energy. In the absence of excess events in both searches, the fundamental parameters of fat-brane UED model, namely, the extra dimensional Planck mass and the size of the small extra dimension will be constrained.

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Citation Formats
E. Akyumuk, “Exploring new physics below and above the electroweak scale,” M.S. - Master of Science, Middle East Technical University, 2022.