Search for Supersymmetry in final states with photons, jets and missing energy

Author: 
Malte Hoffmann
Date: 
Oct 2012

Thesis Type:

In this thesis, a search for supersymmetry in final states with photons, jets and missing transverse energy in 4.03 fb$^{-1}$ of data is presented. The data was collected from proton-proton collisions recorded in 2012 by the CMS detector at the LHC. The center of mass energy is $\sqrt{s}=8$ TeV. Photons are expected e.g. in the decays of possible wino or bino next-to-lightest supersymmetric particles (NLSP) within the GMSB model. The photon reconstruction efficiency is very good due to the excellent resolution of the CMS electromagnetic calorimeter. The NLSP decay is assumed to be prompt and R-parity is assumed to be conserved, which means that the gravitino leaves the detector undetected, leading to missing transverse energy $\displaystyle{\not} E_{T}$.
The $\displaystyle{\not} E_{T}$ distribution in data is compared to the distribution of expected SM backgrounds derived from a control region in data. No excess is observed and exclusion limits are set by comparing the results from data with possible GMSB signals.

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