Jul 6 – 13, 2022
Bologna, Italy
Europe/Rome timezone

Techniques for model-independent interpretations of hidden particle searches

Jul 7, 2022, 12:45 PM
Room 10 (Magenta B)

Room 10 (Magenta B)

Parallel Talk Beyond the Standard Model Beyond the Standard Model


Philipp Klose (Universität Bern)


Hidden particles can help explain many important hints for new physics, but the large variety of viable hidden sector models poses a challenge for the model-independent interpretation of hidden particle searches. We present techniques published in 2105.06477 and 2203.02229 that can be used to compute model-independent rates for hidden sector induced transitions. Adapting an effective field theory (EFT) approach, we develop a framework for constructing portal effective theories (PETs) that couple standard model (SM) fields to generic hidden particles. We also propose a method to streamline the computation of hidden particle production rates by factorizing them into i) a model-independent SM contribution, and ii) a observable-independent hidden sector contribution. Showcasing these techniques, we compute a model-independent transition rate for charged kaon decays into a charged lepton and an arbitrary number of hidden particles. By factorizing the rate, a single form factor is found to parametrize the impact of general hidden sectors. This is used to re-interpret an existing search for HNLs in NA62 data, which yields model-independent constraints on the rate of producing arbitrary hidden particles.

In-person participation Yes

Primary authors

Philipp Klose (Universität Bern) Dr Chiara Arina (Université Catholique de Louvain) Dr Jan Hajer (Universidade de Lisboa)

Presentation materials