Feasibility of new Dark Matter search at ATLAS

Sammanfattning: This thesis examines the idea of calibrating Level 1 jets. These are used in the Trigger-Level Analysis at the ATLAS in the search for a new mediator, in this case between Standard Model and Dark Matter particles. In the thesis, the idea to calibrate the Level 1 jets is investigated. To calibrate the Level 1 jets, they are divided into bins of transverse momentum and pseudorapidity. The responses are then taken to calibrate the transverse momenta of the Level 1 jets, in order to shift the invariant dijet mass towards the real value, and to improve the resolution of its distribution. It is shown that the calibration does not only shift the value, but indeed improves the resolution to a certain extent. To further improve the resolution, a finer binning and taking detector effects into consideration is suggested. The calibration of the Level 1 jets is used to examine in how far a new search for Dark Matter using these jets is feasible.