Particle physics today faces the challenge of explaining the mystery of dark matter, the origin
of matter over anti-matter in the Universe, the origin of the neutrino masses, the apparent …

The LHC has provided an unprecedented amount of proton–proton collision data, bringing
forth exciting opportunities to address fundamental open questions in particle physics …

A bstract The production of a top quark-antiquark pair in association with a W boson
(\(\textrm {t}\overline {\textrm {t}}\textrm {W}\)) is measured in proton-proton collisions at a …

A bstract A search for heavy neutral leptons (HNLs) of Majorana or Dirac type using proton-
proton collision data at\(\sqrt {s}\)= 13 TeV is presented. The data were collected by the CMS …

A bstract The existence of right-handed neutrinos, or heavy neutral leptons (HNLs), is
strongly motivated by the observation of neutrino masses and mixing. The mass of these …

This report, as part of the 2021 Snowmass Process, summarizes the current status of collider
physics at the Energy Frontier, the broad and exciting future prospects identified for the …

A search for long-lived particles (LLPs) decaying in the CMS muon detectors is presented. A
data sample of proton-proton collisions at $\sqrt {s} $= 13 TeV corresponding to an …

A search for a long-lived, heavy neutral lepton ($\mathcal {N} $) in 139 fb $^{-1} $ of $\sqrt
{s}= 13$ TeV $ pp $ collision data collected by the ATLAS detector at the Large Hadron …

A bstract A search for long-lived heavy neutrinos (N) in the decays of B mesons produced in
proton-proton collisions at\(\sqrt {s}\)= 13 TeV is presented. The data sample corresponds to …

The electron-positron stage of the Future Circular Collider, FCC-ee, is a frontier factory for
Higgs, top, electroweak, and flavour physics. It is designed to operate in a 100 km circular …