Searches for Long-Lived Neutral Particles at CMS: Results, Challenges, and Plans

by Paul Lujan (University of Canterbury and CERN)

Wednesday 19 Oct 2016, 15:00 → 16:30 Europe/Rome

1/1-2 - Aula "C. Voci" (Dipartimento di Fisica e Astronomia - Edificio Marzolo)

A variety of models predicts the existence of new long-lived neutral particles, which would produce a very distinctive signature in the CMS detector at the LHC experiment. This talk presents a particular search for long-lived particles which decay into leptons at a significant displacement from the initial interaction, but still within the CMS tracker. The results are interpreted in the context of two models: a hidden valley model with a new long-lived neutral boson X, and a SUSY model with R-parity violation featuring a long-lived neutralino. The extension of this search to similar models, such as decay into jets
instead of lepton pairs, is discussed. One of the principal limitations in this analysis is the CMS trigger, which is not designed for highly displaced tracks as seen in this search. A new trigger algorithm using parallel computing techniques which allows for the detection of events with displaced tracks in a computationally efficient manner is presented.

slides are available at the INFN agenda of this event https://agenda.infn.it/event/18556/