We lay out a comprehensive physics case for a future high-energy muon collider, exploring
a range of collision energies (from 1 to 100 TeV) and luminosities. We highlight the …

Abstract The Standard Model lacks an organizing principle to describe quark and lepton
“flavours”. Neutrino oscillation experiments show that leptons mix very differently from …

A bstract The Fermilab Muon g− 2 experiment recently reported its first measurement of the
anomalous magnetic moment\({a} _ {\mu}^{\mathrm {FNAL}}\), which is in full agreement with …

A bstract This document aims to provide an assessment of the potential of future colliding
beam facilities to perform Higgs boson studies. The analysis builds on the submissions …

Top quarks represent unique high-energy systems since their spin correlations can be
measured, thus allowing to study fundamental aspects of quantum mechanics with qubits at …

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 …

The use of accelerated beams of electrons, protons or ions has furthered the development of
nearly every scientific discipline. However, high-energy muon beams of equivalent quality …

The Belle II experiment recently observed the decay B+→ K+ ν ν for the first time, with a
measured value for the branching ratio of (2.3±0.7)× 10-5. This result exhibits a∼ 3 σ …

We investigate the sensitivity of the projected TeV muon collider to the gauged L μ-L τ
model. Two processes are considered: Z′-mediated two-body scatterings μ+ μ-→ ℓ+ ℓ-with …

A future Higgs Factory will provide improved precision on measurements of Higgs couplings
beyond those obtained by the LHC, and will enable a broad range of investigations across …