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New scalars from an extended Higgs sector could have weak scale masses and still have escaped detection. In a Type I Two Higgs Doublet Model, for instance, even the charged Higgs can be lighter than the top quark. Because electroweak production of these scalars is modest, the greatest opportunity for their detection might come from rare top decays. For mass hierarchies of the type $m_t>m_{H^pm}>m_{A^0,,H^0}$, the natural signal can arise from top quark pair production, followed by the decay chain $t rightarrow b,H^+$, $H^+ rightarrow W^{+(*)} phi^0$, $phi^0rightarrow boverline{b},,tau^+tau^-$, where $phi^0=A^0,,H^0$. These final states largely overlap with those of the Standard Model $t,bar{t},H^0_{_text{SM}}$ process, and therefore can potentially contaminate $t,bar{t},H^0_{_text{SM}}$ searches. We demonstrate that existing $t,bar{t},H^0_{_text{SM}}$ analyses can already probe light extended Higgs sectors, and we derive new constraints from their results. Furthermore, we note that existing excesses in $t,bar{t},H^0_{_text{SM}}$ searches can be naturally explained by the contamination of rare top decays to new light Higgses. We discuss how to distinguish this signal from the Standard Model process.
The Little Higgs model with T-parity (LHT) belongs to the non-minimal flavour violating model. This model has new sources of flavour and CP violation both in quark and leptonic sectors. These new sources of flavour violation originates by the interac
$mathrm{T}overline{mathrm{T}}$ deformation was originally proposed as an irrelevant solvable deformation for 2d relativistic quantum field theories (QFTs). The same family of deformations can also be defined for integrable quantum spin chains which w
We discuss lepton charge asymmetries in $t bar t$ and $t bar t gamma$ production at the LHC, which can be measured in the semileptonic decay channel $t bar t to W^+ b , W^- bar b to ell^+ u b , q bar q bar b$ (or the charge conjugate). Considering s
We study a CP-violating triple product correlation that occurs in the decay of a neutral Higgs boson into tbar{t} pairs when the Higgs boson does not have a definite CP nature. We consider the H -> t bar{t} decay channel as well as the gluon fusion p
The dilepton azimuthal correlation, namely the difference $phi$ between the azimuthal angles of the positive and negative charged lepton in the laboratory frame, provides a stringent test of the spin correlation in $t bar t$ production at the Large H