Hamburg 2016 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 68: Suche nach Supersymmetrie III (Hadronische, Tau, Photon Endzustände)

T 68.1: Vortrag

Mittwoch, 2. März 2016, 16:45–17:00, VMP5 HS B2

Search for supersymmetry in dileptonic final states with jets and missing transverse energy with the JZB method at CMS — Lutz Feld, Jan-Frederik Schulte, and •Marius Teroerde — I. Physikalisches Institut B, RWTH Aachen University

Supersymmetry (SUSY) is a popular extension of the Standard Model of particle physics, as it would solve a variety of problems in modern physics. In the model considered in the presented analysis, a possible final state contains jets as well as the stable lightest supersymmetric particle (LSP), which is produced together with a leptonically decaying Z boson. Thus, the signal is characterized by two same-flavour opposite-sign leptons, missing transverse energy (MET) and the presence of two or more jets.

An important background for this search is the Drell-Yan process with additional jets, as it has a similar event topology. In contrast to SUSY events, Drell-Yan events only contain instrumental MET. Therefore, the variable "jet-Z balance" (JZB), which takes the transverse momentum of the Z boson and the hadronic recoil into account, is distributed differently for Drell-Yan and SUSY events. This allows the definition of a signal depleted control region which is used to predict the Drell-Yan background.

The JZB method was successfully used in several analyses at √s = 7−8 TeV. This talk shows the current progress towards its application on the dataset collected at √s = 13 TeV.