  Till today, although the Standard Model (SM) is the most celebrated theory
that explains nature almost completely, there are still some phenomena observed
in nature that the SM cannot explain. That is why it is needed to look for
theories beyond the Standard Model (BSM). While the ATLAS/CMS experiments
discovered a Standard Model-like Higgs boson at the Large Hadron Collider
(LHC), no compelling new physics signal has been seen yet. Several searches
have been performed at the LHC to look for new physics signal. One such novel
signal is the same-sign diboson (SSdB) + ${E\!\!/}_{T}$ which is a rather clean
signal with negligibly small SM background. Such a unique signature can be
observed in more than one well-motivated BSM scenarios, namely: (i) natural
SUSY models, (ii) type-III seesaw model and (iii) type-II
seesaw/Georgi-Machacek model. In the first part of this poster I present the
discovery prospects of this signal that has been analyzed in these BSM models
in current and future runs of the LHC beside providing ways to distinguish
among these different BSM models. Furthermore, the LHC, being a "top quark
factory", helps in precise measurement of various properties of the top quark.
Deviation from the SM prediction in measuring these properties of the top quark
can, very efficiently, shed light on new physics signal. In the second part of
this poster I present a work in progress where we aim to show how precise
measurement of quantities related to top quark features can indicate towards a
new physics signal.
