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

by Dr Paul Lujan (University of Canterbury CMS Experiment, CERN)

Wednesday 19 Oct 2016, 16:30 → 18:00 Europe/Rome

Aula C. Voci (INFN Padova)

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.