#### Model-independent approaches for the analysis of scenarios with new fermions at the LHC

- Event time: 2:00pm
- Event date: 25th February 2016
- Speaker: Luca Panizzi (University of Southampton)
- Location: Higgs Centre Seminar Room, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

New heavy fermions (both quarks and leptons) are predicted in various scenarios of new physics; depending on their nature they can mix with SM fermions or they can even mediate the production of dark matter states. However, experimental searches at the LHC have not detected any signal of new fermions so far and therefore mass bounds are provided. These bounds are computed by considering minimal extensions of the SM, with just one new fermion and with specific assumptions about its coupling patterns. A reinterpretation of these bounds in the context of theoretical models, which usually contain multiple new fermions with general couplings is therefore not always straightforward.

I will describe model independent methods to recast data from experimental searches. These methods can be used to test general scenarios with any number of extra fermions which can mix with all SM families or couple to dark matter. I will also discuss the complementarity between constraints from the LHC and different observables.

The Particle Physics Theory seminar is a weekly series of talks reflecting the diverse interests of the group. Topics include analytic and numerical calculations based on the Standard Model of elementary particle physics, theories exploring new physics, as well as more formal developments in gauge theories and gravity..