Investigating various Aspect of Neutrino Non-Standard Interaction
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Date
31-10-2023
Researcher
Sarkar, Trisha
Supervisor
Sinha, Monika
Journal Title
Journal ISSN
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Publisher
Indian Institute of Tehcnology, Jodhpur
Abstract
The Standard Model (SM) of particle physics is by far the most successful theory of the
fundamental interactions of nature. But still, it cannot be considered the ultimate theory as it fails to accommodate gravity, dark matter and dark energy. This motivates us to look for beyond Standard Model (BSM) physics. Neutrinos, in particular, provide an elegant platform to probe such BSM physics. The neutrino oscillation (NO) experimental data can be explained within the context of the SM framework. However, in the light of upcoming high precision experiments,neutrinos have immense potential to analyze the BSM physics which is popularly known as nonstandard interaction (NSI). In this thesis, I study various facets of NSI and analyze the effect of NSI in several physical systems. The repercussion of NSI is possible to be observed at the lower energy scale such as the terrestrial neutrino accelerator or reactor experiments which operate within the energy range ∼MeV-GeV, as well as in the ultra high energy (UHE) regime (≳ EeV). We study the effect of vector type NSI on the shower events generated by UHE neutrinos detectable by neutrino telescopes such as the IceCube observatory. The UHE neutrinos arrive at Earth originating from different sources of cosmic accelerators and initiate deep inelastic scattering (DIS) with the nucleons present inside the Earth. Such interactions are capable of producing microscopic black holes (MBH)if the Universe consists of large extra spatial dimensions which also consequently gives rise to TeV scale gravity. These MBHs quickly decay producing a large number of shower events. We find that in the presence of vector type NSI, the large number of shower events clearly indicates the signal of TeV scale gravity. In the domain of lower energy domain, we analyze the effect of vector NSI on the various measures of temporal and spatial correlations present in the three flavour neutrino system, which exhibit the entanglement embedded in the system and are directly related to the neutrino oscillation probability, in the context of long baseline (LBL) accelerator experimental setup DUNE. We find that for the LMA-Dark solution of vector NSI, the temporal correlation quantified in terms of Leggett-Garg type Inequality (LGtI) shows violation at the energy corresponding to the maximum flux observable at DUNE. The spatial correlations involved in this study, the flavour entropy and genuine tripartite entanglement also exhibit significant deviation in the presence of NSI as compared to the result obtained for the SM."
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Citation
Sarkar, Trisha (2018). Investigating various Aspect of Neutrino Non-Standard Interaction (Doctor's thesis). Indian Institute of Tehcnology, Jodhpur