Bonn 2020 – scientific programme
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T: Fachverband Teilchenphysik
T 15: Search for new particles I
T 15.6: Talk
Monday, March 30, 2020, 17:45–18:00, H-HS XVI
Search for long lived particles produced in Higgs decays with lifetimes up to the muon system — •Jörg Schindler, Lisa Benato, Melanie Eich, Gregor Kasieczka, and Karla Peña — Institut für Experimentalphysik, Universität Hamburg
Traditionally, searches for new physics at the LHC focused on already established objects, like photons, leptons, jets or missing energy. A different approach is to look for signatures in the detector which up until now were not considered. One such signatures are long lived particles, which have a macroscopic lifetime ranging from a few micrometers up to several kilometers. Such particles are for example predicted by twin Higgs models, where a dark sector mirroring the SM particles is introduced. The Higgs boson mixes with its dark partner, acting as a mediator between the SM and dark sector and therefore can decay into non-SM particles. These non-SM particles are the long-lived neutral scalars πν, which later decay back into SM particles, predominantly b quarks.
In this talk the search for long lived particles which decay after the tracker is presented. These signatures can be observed with close to no background, but require the development of new reconstruction and analysis tools.
The status of the current search for LLPs with long lifetimes is shown, using data collected by the CMS detector in run 2.