Monalisa Patra

Detailed analysis of flavor-changing decays of top quarks as a probe of new physics at the LHC

If the LHC should fail to observe direct signals for new physics, it may become necessary to look for new physics effects in rare events such as flavor-changing decays of the top quark, which, in the standard model, are predicted to be too small to be observed. We set up the theoretical framework in which experimentally accessible results can be expected in models of new physics, and go on to discuss two models of supersymmetry\char22{}one with conserved

Invisible decays of the lightest Higgs boson in supersymmetric models

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W physics at the ILC with polarized beams as a probe of the Littlest Higgs model

-parity, and one without

Invisible decays of low mass Higgs bosons in supersymmetric models

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Probing Higgs-radion mixing in warped models through complementary searches at the LHC and the ILC

-parity\char22{}to illustrate how the flavor-changing signals are predicted in these models. In the latter case, there is a distinct possibility of detecting the rare decay

Signals of additional Z′ boson in e+e− → W+W− at the ILC with polarized beams

t\ensuremath{\rightarrow}c+{Z}^{0}

Isolating C P -violating γ Z Z coupling in e + e − → γ Z with transverse beam polarizations

at the LHC. We also present a detailed set of very general formulas which can be used to make similar calculations in diverse models of new physics.

Generalized top-spin analysis and new physics in e(+)e(-) collisions with beam polarization

We consider supersymmetric models in which the lightest Higgs scalar can decay invisibly consistent with the constraints on the 126 GeV state discovered at the CERN LHC. We consider the invisible decay in the minimal supersymmetric standard model (MSSM), as well its extension containing an additional chiral singlet superfield, the so-called next-to-minimal or nonminimal supersymmetric standard model (NMSSM). We consider the case of MSSM with both universal as well as nonuniversal gaugino masses at the grand unified scale, and find that only an

Probing strongly interacting W’s at the ILC with polarized beams

{E}_{6}

Isolating CP-violating

grand unified model with unnaturally large representation can give rise to sufficiently light neutralinos which can possibly lead to the invisible decay