Many models of physics beyond the Standard Model (SM) contain enhanced couplings to third generation quarks. We present an overview of searches for new physics containing top and bottom quarks in the final state, using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. These results cover non-SUSY based extensions of the SM,...
In the present talk the search for new resonances decaying to tt resonances, as well as the search for new vector-like quarks will be presented. The search is performed with the ATLAS experiment at the LHC using proton-proton collision data. The current status of the ATLAS searches in different topolo- gies will be reviewed, addressing the used analysis techniques, in particular the selection...
The heavy scalar resonance search channel of gg → S → tt is very challenging, caused by a large destructive interference with the SM background. We analyze the line shapes of heavy scalars in several well-motivated beyond the standard model physics models. Commonly existing additional contributions to the glu-glu-scalar coupling change the relative phases of the signal and background...
We present results of searches for massive top and bottom quark partners using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 8 and 13 TeV. These fourth-generation vector-like quarks are postulated to solve the Hierarchy problem and stabilize the Higgs mass, while escaping constraints on the Higgs cross section measurement. The...
Fermionic and vector resonances are a generic prediction of theories where electroweak symmetry breaking is triggered by new strongly interacting dynamics at the TeV scale.
We work in a "discrete" two site prescription of the Composite Higgs model where the spontaneous breaking of the SO(5)/SO(4) coset gives the Standard Model gauge bosons and six heavy vector resonances. We implement...
We assess current experimental constraints on the bi-doublet + singlet model of top compositeness previously proposed in the literature. This model extends the standard model's spectrum by adding a custodially-embedded vector-like electroweak bi-doublet of quarks and a vector-like electroweak singlet quark. While either of those states alone would make the model vulnerable to constraints from...
We present the discovery potential for a TeV-scale $H^{\pm}$
though its decays to boosted heavy quarks ($pp\to t H^{\pm} + X\to t (tb) + X$).
In the alignment limit of a type-II two Higgs doublet model,
searches for $H^{\pm}$ effectively constrain its neutral siblings ($H/A$).
We tag massive $H^{\pm}\to t b$ by pairing a high-efficiency
boosted-top tag with our low fake-rate $\mu_x$...
There are searches for a $W'$ through many different decay channels at the LHC. Here we study the search for the $W'$ in the decay channel $W' \to tb$, including the decay of the top, at NLO+NLL in QCD. When applying cuts to the events, it is important to have the most precise predictions for the kinematics of the final state particles. Resummation allows us to include the soft gluon effects...
