We present results of searches for massive vector-like quark partners using proton-proton collision data collected with the CMS detector at the CERN LHC at a center-of-mass energy of 13 TeV. These fourth-generation quarks are postulated to solve the Hierarchy problem and stabilize the Higgs mass, while escaping constraints on the Higgs cross section measurement. The vector-like quark can...
Vector like quarks appear in many theories beyond the Standard Model as a
way to cancel the mass divergence for the Higgs boson. The current status
of the ATLAS searches for the production of vector like quarks will be
reviewed for proton-proton collisions at 13 TeV. This presentation will
address the analysis techniques, in particular the selection criteria, the
background modeling and the...
Higgs boson pair production in the standard model is a rare process, with rates beyond the reach of the currently collected LHC data. The cross section can however be appreciably modified by new physics effects, in particular when the theory contains vector-like quarks, so that di-Higgs boson production could be detectable at the LHC within current data.
We use a phenomenological model...
If the standard model Higgs boson were much heavier, it would appear as
a broad resonance since its decay into a pair of longitudinally polarized gauge bosons is highly enhanced. We study whether the same enhancement happens at loop level in a simple extension of the standard model with a singlet scalar boson S. In order to focus on the loop effects, S is assumed to have no interaction at tree...
Many extensions of the Standard Model that address open issues such as dark matter and baryogenesis require long-lived particles that decay at macroscopic distances and often result in non-conventional signatures in the detector. The broad class of long-lived phenomena presents rich discovery opportunities for the LHC. In this talk I will provide an overview of the searches for long-lived...
The Model Unspecific Search in CMS (MUSiC) represents an alternative analysis strategy to the wide range of dedicated searched performed with LHC data. Apart from offering a consistent overview of a large portion of the CMS data, the analysis also assists in covering regions not investigated by other analyses. This ensures new phenomena are not overlooked simply because certain sectors of the...
Electroweakly charged fermions carrying a strong but dark self-interaction can be pair produced at the LHC and form a bound state. If the bound state is a vector that carries net electric charge, it can be produced through the Drell-Yan process and decay dominantly into the SM $W^{\pm}$ plus a hidden scalar $\phi$, which later decays into SM $b\bar{b}$ through a Higgs mixing. The collider...
Inflection-point inflation is an interesting possibility to realize a successful slow-roll inflation when inflation is driven by a single scalar field with its value during inflation below the Planck mass ($\phi_I \leq M_{Pl}$). In order for a renormalization group (RG) improved effective $\lambda \phi^4$ potential to develop an inflection-point, the running quartic coupling $\lambda(\phi)$...
