Phenomenology of Universal Extra Dimensional Models
Abstract
In this talk, we will discuss Universal Extra Dimensional models (UED) in its basic and non-minimal version (nmUED). Non-minimality in Universal Extra Dimensional (UED) framework is realized by adding boundary localized terms (BLT). We will discuss the unitarity constraints in gauge and scalar sectors. We shall show that some of the tree-level two-body scattering amplitudes in gauge and scalar sectors do not respect partial wave unitarity. Unitarity of scalar sector of this model leads to an upper bound on gauge or scalar BLT parameter which depends on the maximum number of Kaluza-Klein (KK) mode considered in the analysis. We shall also show the limit on compactification radius of UED in view of the Zbb coupling. For suitable choice of BLT parameters (which is permissible from unitarity analysis), 95% C.L. lower limit on inverse of compactification radius comes out to be in the range of 1 TeV in the framework of nmUED. Finally, we will discuss some flavor changing top quark decays. In UED these decay rates do not change much from their Standard Model (SM) values. However, in nmUED these decay rates can be higher than SM for specific choices of the BLT parameters for a certain range of inverse compactification radius. But these model parameters may lead to Kaluza-Klein particle masses that are in tension with the LHC and LEP bounds.
03/11/2017 at 4:00 pm
Sabya Sachi Chatterjee
HEP Seminar
Lecture Hall Block A, Institute of Physics
Document Date:
Exploring Light Sterile Neutrinos and Long-Range Forces in Long-Baseline Experiments
The discovery of neutrino oscillation made a major breakthrough in particle physics as it implies that neutrinos have mass and thus provides very strong evidence for new physics beyond the SM. So far huge progress has been made in extracting the information about the knowledge of the neutrino masses and lepton flavour mixing parameters through the various neutrino experiments. However, there is no information about the mass hierarchy of neutrino, CP violation in neutrino flavor transition and octant of atmospheric mixing angle.
All these parameters play crucial role in neutrino mass model building. Therefore, many neutrino oscillation experiments are intended to determine these unknowns. This talk presents a sensitivity of current (T2K and NOvA) and future (T2HK) generation experiments to determine the unknowns in this sector.
This is followed by a discussion on how do non-standard interactions of neutrino affect the sensitivity of LBL experiments. Finally, this talk also presents a study on the non-unitary lepton mixing in an inverse seesaw and its impact on the sensitivity of LBL experiments.
