Science · Particle Physics
which detector upgrades most improve sensitivity to long-lived particles?
Long-lived particles (LLPs) evade many standard searches because their decays occur millimeters to kilometers from the collision point. Experiments improve sensitivity by resolving displaced vertices, rejecting pileup, and triggering on
which collider signatures would uniquely indicate composite higgs models?
Resonances and top partners
The most direct collider evidence for a composite Higgs would be the discovery of new resonances associated with the strong dynamics that bind the Higgs. Leading theoretical
what mechanisms explain the matter-antimatter asymmetry in the universe?
The observed dominance of matter over antimatter requires physical processes that produced a net baryon number in the early Universe. Andrei Sakharov at the Lebedev Physical Institute identified three necessary
how could future colliders probe axion-like particle couplings?
Axion-like particles are light, pseudoscalar bosons that can couple to photons, gluons, or fermions. Theoretical reviews by Andreas Ringwald at DESY explain how such couplings arise from broken global symmetries
how can gravitational wave observations constrain particle physics models?
Gravitational waves provide a direct probe of processes in the early Universe that are otherwise inaccessible to particle colliders. A measured or constrained stochastic gravitational-wave background maps onto the energy,
what are the experimental prospects for observing glueballs at colliders?
The search for glueballs probes a core prediction of quantum chromodynamics that color-carrying gluons can bind into color-neutral states. Lattice QCD calculations provide the most direct nonperturbative evidence for such
how do parton showers influence jet substructure measurements at colliders?
Parton showers shape the internal radiation pattern of jets and so directly determine many jet substructure observables used at collider experiments. Monte Carlo event generators implement approximate all-orders QCD radiation
what observable signals would indicate a dark photon at colliders?
The signature of a dark photon at colliders would be a set of correlated, experimentally accessible anomalies tied to how a new U(1) gauge boson mixes with the Standard Model.
how can precision measurements test physics beyond the standard model?
Precision tests probe the Standard Model by measuring quantities so accurately that tiny contributions from hypothetical particles or forces become detectable. By comparing an experimental value with a Standard Model
what role do effective field theories play in collider predictions?
Effective descriptions of short-distance physics allow collider predictions to be both practical and systematically improvable. Pioneering work by Steven Weinberg at University of Texas at Austin framed the modern view