Wuppertal 2015 – scientific programme

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T: Fachverband Teilchenphysik

T 77: SUSY: Untergrundabschätzungen, Spezielle Suchen

T 77.1: Talk

Wednesday, March 11, 2015, 16:45–17:00, K.11.10 (K8)

Estimation of the Irreducible Z→νν Background for Searches with Jets and Missing Transverse Momentum at CMS — •Simon Kurz, Christian Sander, Arne-Rasmus Dräger, and Marek Niedziela — Universität Hamburg, Institut für Experimentalphysik

Supersymmetry (SUSY) is one of the most promising extensions of the Standard Model of particle physics (SM), since it provides solutions of various shortcomings of the Standard Model. In many SUSY models final states with jets, no light leptons (electrons or muons) and large amounts of missing transverse energy are expected. One of the irreducible SM backgrounds for a search in this final state are events in which a Z boson is produced in association with jets, with the Z decaying to two neutrinos.

In this talk, a method is presented that uses events in which the Z boson decays into a pair of light leptons. The missing transverse momentum signature is faked by removing the leptons from the event. The main challenge of this method is the large statistical uncertainty especially for search regions with hard cuts e.g. on the missing transverse energy. In order to overcome this problem dedicated extrapolation methods have been developed.