Search for SUSY compressed scenario

by Roger Caminal Armadans (PhD student)

Wednesday 15 Oct 2014, 13:00 → 14:00 Europe/Madrid

Seminar (IFAE)

This talk reports results of a search for new phenomena using 20.3 fb^{−1} of proton-proton collision data at \sqrt{s} = 8 TeV recorded by the ATLAS experiment at the LHC. A monojet analysis strategy is followed, in which events are required to have a very high energetic jet and large missing tranverse energy, with a maximum of three reconstructed jets. No excess above the Standard Model background expectation is observed and the results are then interpreted as exclusion limits for several models. On one hand, the monojet analysis allows to access a region in the parameter space of supersymmetric models not accessible for other analyses, since it has large sensitivity for compressed scenarios. In particular, it is interpreted in terms of many models involving pair production of stops, sbottoms, 1st and 2nd generation squarks or gluinos, while sensitivity studies are shown for the direct production of charginos or neutralinos. Furthermore, an interpretation in terms of very light gravitino production in GMSB scenarios is also performed. On the other hand, other non supersymmetric models beyond the SM are also considered. The monojet results are used to set limits on the fundamental Planck scale for ADD large extra dimension models. Finally, limits on different effective theories and simplified models involving pair production of WIMPs in colliders are also set. These limits can be translated into WIMP-nucleon cross section limits and compared to direct searches experiments.

Slides IFAEPizzaSeminarIntro_2014-10-15.pdf