I am using the CMS detector at the CERN LHC to search for new physics at the energy frontier. In particular, I am interested in exotic long lived particles that produce strange signatures in the detector, and may go unnoticed by orthodox searches. I lead the CMS physics working group in this area. Our recent results include searches for neutral particles that decay to leptons within the CMS detector, long lived particles that decay to photons, and massive slow moving particles. With the early LHC data, I pioneered a search for particles that become stuck in the detector and decay later. Unfortunately this search did not discover any new physics, but did allow us to place some of the first limits on new physics from the LHC. I am also developing methods for measuring the properties of a Higgs boson, should we discover it, that will tell us whether we have found a Standard Model Higgs, or some more exotic version. In particular, I am interested in measuring the coupling of the Higgs to invisible particles, such as Dark Matter.
A major challenge of the LHC is the online "Trigger" system, that selects events of interest in real time, to keep the data rate out of the detector to a manageable level. I developed algorithms, hardware and software for the CMS Level 1 trigger, and then commissioned it before and during LHC startup. However, future upgrades of the LHC will place increasing demands on the existing trigger system, so I am collaborating with other CMS members from the UK on the next generation of trigger systems.
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