NP in the ttbb final state at the LHC

EZEQUIEL ALVAREZ; MARIEL ESTEVEZ

Gran Buenos Aires

Workshop; HP2.6 High Precision for Hard Processes 6; 2016

CERN

The search for new physics is waiting for results yet to come at LHC Run II. The existence of heavy particles strongly coupled to the third generation of quarks is a well motivated by theoretical and experimental hints field of research. The measurement of these kind or particles is not an easy task at the acelerator because the $b$ quark is hard to tag and the $t$ quark is hard to produce. This is why it would be of great interest to bear in mind the expectable cross sections for this new hipotetical particles and feasible related observables.In this work, we make a recopilation of these hints, from LEP anomaly to pecularities and excesses presented in the latest works from ATLAS and CMS. We propose the study of observables related to the $pp \rightarrow t \overline{t} b \overline{b}$ process and we calculate a sensitivity from MC simulation and experimental bounds to contrast with $b \overline{b} b \overline{b}$ and $t \overline{t} t \overline{t}$ production, exposing the contour plots. We have found a zone in the parameters plane where $ t \overline{t} b \overline{b}$ is sensitive and therefore, very interesting to measure. Finally, we propose new MC independent observables which may result more advantageous than the classic ones in some cases.