Large Hadron Collider (LHC) is a top quark factory, which is the heaviest elementary particle discovered so far. Due to its small life-time top quark decays before hadronization, and hence most of its properties are not washed out. Top quark events are often a large background i…
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A measurement using the ATLAS detector has been made of the fraction of events in proton-proton collisions at √s = 7 TeV that do not contain additional jets in the rapidity region bounded by a di-jet system. This provided a strong test of perturbative QCD in the new energy regim…
Two searches for non-resonant new physics phenomena are presented using the data collected with ATLAS in proton-proton collisions at the Large Hadron Collider. The 2012 √s = 8 TeV dataset is used to search for large extra spatial dimensions and the 2015 √ s = 13 TeV dataset is u…
Exploiting the substructure of jets observed at the LHC to better understand and interpret the experimental data has recently been a very active area of research. In this thesis we study the substructure of high-pt QCD jets, which form a background to many new physics searches. …
To gain insight into the structure of the nucleon, we pursue the development of the phenomenological model of Islam et al. (IIFS model) for high energy elastic pp and p ̄p scattering. We determine the energy dependence of the parameters of the IIFS model using the available elast…