Mainz 2014 – scientific programme
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T: Fachverband Teilchenphysik
T 67: Suche nach neuer Physik 1
T 67.3: Talk
Tuesday, March 25, 2014, 17:20–17:35, P110
Model Independent Search in di-Mass-Space using Events with Missing Transverse Energy with the CMS detector — •Sarah Beranek1, Georgios Anagnostou2, and Stefan Schael1 — 11. Physikalisches Institut B, RWTH Aachen, Deutschland — 2Institute of Nuclear and Particle Physics Demokritos, Athens, Greece
A model independent method to search for particles of unknown masses in events with top pair like decays is presented. No constraints on the masses are required, the only assumption is the topology of the decay chain.
The method uses the solvability of the equation system of this decay and scans thereby the whole 2-dimensional mass space for the existence of a solution. Since the collision energy gives an upper limit to the allowed mass space, probabilities from parton density functions are taken into account. Additionally the measured particle kinematics are smeared with the detector resolution. The method is tested in events with top pairs decaying to two leptons with the presence of two neutrinos in the final state. The events are recorded with the CMS detector with a center of mass energy of 8 TeV and an integrated luminosity of 20/fb. Top quark and W boson are observed simultaneously without any a-priori knowledge.
Possible applications are searches for heavy resonances decaying to two top pairs as well as next generation heavy quarks. This analysis can set limits on the existence of any particle decaying to the topology and final state mentioned above.