Conveners
WG 1 - Searches: Session 1
- Aleksander Filip Zarnecki (Faculty of Physics, University of Warsaw)
WG 1 - Searches
- Roberto Franceschini (CERN)
Description
Physics Potential - Searches
"Direct searches" working group (WG1-SRCH)
Roberto Franceschini, Rebeca Gonzalez Suarez, Aleksander Filip Żarnecki
Many physics problems such as neutrino masses and the nature of dark matter predict particles with long lifetimes as an important possibility in the search for new phenomena. When produced at colliders, these long-lived particles (LLPs) have a distinct experimental signature: they can decay far from the collision point, or even completely pass through a detector before decaying. Since most of...
The proposed LUXE (LASER Und XFEL Experiment) at DESY, Hamburg, using the 16.5 GeV electron beam from the European XFEL, aims to probe QED in the non-perturbative regime created in collisions between high-intensity laser pulses and high-energy electron or photon beams. This setup also provides a unique opportunity to probe physics beyond the Standard Model by leveraging the large photon flux...
Feebly interacting massive particles (FIMPs) are characterised by very weak couplings and can be mediators to the dark sector or dark matter (DM) candidates themselves. In the latter case, the DM abundance is determined by the freeze-in mechanism (in contrast to freeze-out for WIMPs). Many FIMP scenarios are difficult to be constrained at the LHC and future e+e- Higgs factories seem to be...
The direct pair-production of the tau-lepton superpartner, stau, is one of the most interesting
channels to search for SUSY. First of all the stau is with high probability the lightest of
the scalar leptons. Secondly the signature of stau pair production signal events is one of
the most difficult ones, yielding the 'worst' and thus most general scenario for the searches.
The most...
A study of the prospects for discovering or excluding SUSY at various
proposed future colliders is presented. The study is based on scan-
ning the relevant parameter space of (weak-scale) SUSY parameters.
In particular, I concentrate on the properties most relevant to evalu-
ate the experimental prospects: mass differences, lifetimes and decay-
modes. The observations are then confronted...
The nature of electroweak symmetry breaking and the Higgs bosons are likely paths to physics beyond the standard model. Neutral naturalness, symmetry based constructions for addressing the electroweak hierarchy problem/puzzle, have garnered increasing interest as LHC bounds on new colored states have increased. These models often predict new electroweak states along with a rich Higgs sector. I...
Neutrinos are probably the most mysterious particles of the Standard Model. The mass hierarchy, oscillations and the nature of their antiparticles are currently being studied in many experiments. Moreover, in models of New Physics, baryon asymmetry or dark matter density are explained by introducing new species of neutrinos. Among others, heavy neutrinos of the Dirac or Majorana nature were...
With mono-photon signature, high energy e$^+$e$^-$ colliders offer unique possibility to look for processes with fully invisible final state, pair-production of dark matter particles in particular. Most studies in the past focused on scenarios assuming heavy mediator exchange. However, scenarios with light mediator exchange are still not excluded by existing experimental data, if the mediator...
In theories where dark matter is explained by the existence of a 'dark sector', interacting with the visible sector of the standard model via gravitation, the photon of the dark sector, the dark photon $(A_{D})$, might be the only visible manifestation of the dark sector due to kinetic mixing with the (ordinary) photon. The strength of the mixing is given by a mixing parameter $(\epsilon)$....
New U(1) gauge theories involving Standard Model (SM) fermions typically require additional electroweak fermions for anomaly cancellation. We study the non-decoupling properties of these new fermions, called anomalons, in the Z−Z′−γ vertex function, reviewing the connection between the full model and the effective Wess-Zumino operator. We calculate the exotic Z→Z′γ decay width in U(1)B−L and...
