I will present a brief review of the role of the top and bottom quarks in an exhaustive characterization of the Standard Model and its possible extensions. The talk will explore the many connections between the top and Higgs/EW sectors and will highlight the qualitatively new information that can be obtained with new installations. I discuss existing work and indicate a few areas where further...
One of the main goals of the future $e^+e^-$ colliders is to measure the top-quark mass and width in a scan of the pair production threshold. Yet, the shape of the threshold cross section depends also on other model parameters as the top Yukawa coupling and the strong coupling constant. We study the expected precision of the top-quark mass determination from the threshold scan at CLIC, ILC...
We introduce a new data format tailored to provide an easy and efficient entry into projections for e+e- colliders, called miniDST. The miniDST comprises isolated electron, muon, tau and photon candidates, jets with b- and c-tagging information, particle flow objects and MC truth information as well as event shape variables.
It is based on LCIO and is directly readable in root.
The miniDST...
A robust knowledge of the proton subnuclear structure is a crucial input at the LHC. The uncertainty on the Parton Distribution Functions (PDFs) often represents a limiting factor in the accuracy of theoretical predictions at hadron colliders and this will be even more crucial in the High Luminosity run. I will give an overview of the new exciting challenges that the precision frontier is...
With the recent approval of CD-0 for the Electron-Ion Collider and its siting at Brookhaven National Lab, the EIC program enjoys strong forward momentum. As a community, we are now tasked with understanding the phenomenological implications of the future EIC program, which will extend to many corners of particle physics, and planning accordingly to enhance the scientific impact. In this talk,...
We discuss about the possibility of constraining heavy-flavor parton distribution functions (PDFs) in the proton, in particular the top and bottom PDFs. We discuss about heavy-flavor initiated processes and their potential impact in future global PDF analyses.
We revisit the Higgs-to-invisible decay ratio in Higgs-portal dark matter models. The Higgs-to-invisible decay searches are powerful probes of the models with increasing sensitivity in upcoming colliders. Close to the mass threshold of a Higgs decay into a pair of DM particles, the coupling value is expected to be very small in order to be compatible with the observed value of the thermal...
One of the important goals of the proposed future $e^+e^-$ collider experiments is the search for dark matter particles using different experimental approaches. The most general one is based on the mono-photon signature, which is expected when production of the invisible final state is accompanied by a hard photon from initial state radiation. We propose the procedure of merging the matrix...
A number of astrophysical observations based on gravitational interactions point to the existence of dark matter (DM) in the Universe, which can not be described with the Standard Model (SM). Many of the proposed extensions of the SM, which can provide a dark matter candidate, involve extended scalar sector and new scalar particles which could be produced at future $e^+e^-$ colliders. We...
The electroweak (EW) sector of the Minimal Supersymmetric Standard Model
(MSSM) can account for variety of experimental data. The lighest
supersymmetric particle (LSP), which we take as the lightest neutralino,
$\tilde \chi_1^0$, can account for the observed Dark Matter (DM)
content of the universe via coannihilation with the next-to-LSP
(NLSP), while being in agreement with negative...
We examine the region of the parameter space of the Next to Minimal
Supersymmetric Standard Model (NMSSM) with a light neutralino~($M_{\tilde\chi_1^0} \leq~$62.5 GeV) where the SM-like Higgs boson can decay invisibly, the thermal neutralino relic density is smaller than the measured cold dark
matter relic density, and where experimental constraints from LHC searches
and flavor physics are...
The neutrino oscillation experiment has clearly pointed out that the Standard Model neutrinos have tiny masses and their flavors are mixed. There are a plenty of models which explain the mechanism of the generation of the neutrino mass. In this talk we will discuss about the simple neutrino mass generation process at the TeV scale which is often called the seesaw mechanism and its testability...
Observed tiny neutrino masses may indicate the existence of new physics including a source of Lepton Number Violation (LNV) at high energies. The effect of such a high-scale physics may be well described by higher dimensional LNV operators. We investigated the dimension-five lepton number violating operator, ℓ±ℓ'±W∓W∓, containing important information on the origin of tiny neutrino masses,...
There is growing interest in the far forward region at the LHC. Detectors placed hundreds of meters downstream from existing interaction points along the beam collision axis may search for LLPs, detect thousands of TeV neutrinos, and make measurements of relevance for a broad range of topics, from hadronic physics to cosmic ray experiments. These efforts are currently limited to fit within...
Droplets of quark-gluon plasma (QGP), a state of strongly interacting quantum chromodynamics matter, are produced in high-energy collisions between heavy nuclei. Recent theoretical studies suggest using the top quark, the heaviest elementary particle known to date, as a novel time-delayed probe of the QGP. The top quark is a colored particle that decays almost always into a W boson plus a...
Electromagnetic fields surrounding LHC beams source high energy photons that can collide to produce new particles. We highlight important and interesting BSM physics targets for QED production from two recent proposals: 1) slepton and dark matter production with proton-tagging using pp beams, 2) new physics modifications to tau g-2 using PbPb beams. These open new cross-cutting opportunities...