For the past five years I predominantly work on studying
anomalous couplings in electroweak sector with polarization of final state and initial
state particle. In collaboration with Dr. Ritesh K. Singh I studied the anomalous trilinear gauge couplings
of Z and g using a complete set of polarization asymmetries for Z boson
in e+e- --> ZZ/Zgamma processes with unpolarized initial beams and obtain a simultaneous
limit on all the anomalous couplings using Markov Chain Monte Carlo (MCMC)
method. Next I studied the effect of beam (e) polarization on the sensitivity of polarization
observables on the anomalous couplings in the same processes and estimated
best choice of beam polarization in terms of measure of goodness based on averaged likelihood.
After this, I studied anomalous W+W-V (V = Z, gamma) couplings in the process
e+e- --> W+W- with W boson polarization and beam polarization and obtain constrain
on the anomalous couplings using MCMC.
Next I studied ZZ production process at LHC
in 4l channel including aTGC with QCD correction using spin polarization of Z boson
together with total rate.
I was also involved in studying the anomalous ZZH and
ZZHH couplings in the processes e+e- --> ZHH and e+e- --> HH nu nu_bar In collaboration with
Prof. P. Paulose et. al.
We study sensitivity
of cross section and other kinematic distributions on the anomalous couplings.
In collaboration with P. Poulose et. al. I also studied the Flavour
Changing Neutral Current (FCNC) in the single top quark production via tqZ interaction
at the proposed Large Hadron electron Collider (LHeC) with polarized electron beams.
We reconstruct the missing neutrino (nl) coming from t --> W+b, W+ --> nu_l l+ to construct
the polarization observables of top quark and use them to study signal as well as relevant
background and obtain constrain on the non-standard tqZ couplings.
Currently I am studying WWZ (WWgamma) anomalous couplings in WZ
(Wgamma) production process at LHC using Z,W (W) polarization. The WZ process can also
be taken as the major background for trilepton plus missing energy final state at LHC
to search for supersymmetric particle. I am also involved in studying the sensitivity of
CP-violating operators in process ZH, ZW production at LHC using spin polarization
observables of Z boson in collaboration with Dr. Adam Falkowski. We see the effects of
hadronized-detector simulation on the sensitivity of the observables. This work is part of
Indo-French network project.