Exploring new physics below and above the electroweak scale

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.


Exploring extra dimensions through rare processes
Şimşek, Kağan; Turan, İsmail; Department of Physics (2019)
We study the single top quark production and decay mechanisms at one-loop level occurring via flavor-changing neutral currents in the Minimal Universal Extra Dimensions (MUED) model. We make a complete study of the model in the Feynman gauge. Especially, we focus on extracting the complete list of 3- and 4-point interactions and determining the mixings among the gauge eigenstates to form the so-called mass eigenstates. Once we have the complete model analyzed, it is implemented via the LanHEP package and tr...
Hosseinpour Dashatan, Saeid; Arıkan, Mehmet Ali Sahir; Parnas, Kemal Levend; Department of Mechanical Engineering (2021-8-13)
In some applications of composite laminates, thickness variation is necessary to fulfill specific design requirements. One way of accomplishing the intentional thickness variation in composite structures is terminating some plies within a layup. Introducing ply drop-offs causes geometrical and material discontinuities, which lead to high localized stresses around drop-off locations. Despite all the progress made in damage analyses of tapered composite laminates, estimating their load-carrying capacity and s...
Investigation of model updating techniques and their applications to aircraft structures
Kozak, Mustafa Tuğrul; Özgüven, Hasan Nevzat; Department of Mechanical Engineering (2006)
Mathematical models that are built in order to simulate the behavior of structures, most often, tend to respond differently than the actual structures in their initial state. In order to use the mathematical models and their computational outputs instead of testing the real structure under every possible case, it is mandatory to have a mathematical model that reflects the characteristics of the actual structure in the best possible way. In this thesis, the so called model updating techniques used for updati...
Toward Data-Driven Models of Legged Locomotion using Harmonic Transfer Functions
Uyanik, Ismail; Ankaralı, Mustafa Mert; Cowan, Noah J.; Morgul, Omer; Saranlı, Uluç (2015-07-31)
There are limitations on the extent to which manually constructed mathematical models can capture relevant aspects of legged locomotion. Even simple models for basic behaviours such as running involve non-integrable dynamics, requiring the use of possibly inaccurate approximations in the design of model-based controllers. In this study, we show how data-driven frequency domain system identification methods can be used to obtain input–output characteristics for a class of dynamical systems around their limit...
Sensitivity of the SHiP experiment to Heavy Neutral Leptons
Ahdida, C.; et. al. (Springer Science and Business Media LLC, 2019-04-01)
Heavy Neutral Leptons (HNLs) are hypothetical particles predicted by many extensions of the Standard Model. These particles can, among other things, explain the origin of neutrino masses, generate the observed matter-antimatter asymmetry in the Universe and provide a dark matter candidate.
Citation Formats
E. Akyumuk, “Exploring new physics below and above the electroweak scale,” M.S. - Master of Science, Middle East Technical University, 2022.