Speaker
Description
Because of their clean environment and triggerless operation, the future Higgs factories seem to be a very good place to search for long-lived particles. Such studies will still be experimentally very challenging, especially in the context of detector and software requirements. Hence, we believe that these searches could constitute a good benchmark for comparisons between different proposals for the experiments at the future Higgs factories.
The experimental sensitivity to various BSM scenarios is usually presented as a function of the parameters describing a particular model. However, if different models are considered by different experiments, this makes comparisons of their results very difficult. To compare the experimental sensitivity, a more experiment-focused approach is needed, where limits are presented as a function of the physical properties of BSM particles, such as their mass, lifetime, or production cross section.
Also, the experiments at e$^+$e$^-$ colliders should allow for full event reconstruction. Higher sensitivity could be expected compared to a hadron collider, where one has to rely only on a given signature. However, one has to define the event topology of interest. For this reason, we propose a classification of the LLP signatures based on the production and decay channels. We show that many of the possible scenarios can be referred to existing theoretical models, allowing the “experimental” benchmarks to be translated into points in a model parameter space.
