Recent results of the searches for Supersymmetry in final states with one or two leptons at CMS are presented. Many Supersymmetry scenarios, including the Constrained Minimal Supersymmetric extension of the Standard Model (CMSSM), predict a substantial amount of events containing leptons, while the largest fraction of Standard Model background events -which are QCD interactions -gets strongly reduced by requiring isolated leptons. The analyzed data was taken in 2011 and corresponds to an integrated luminosity of approximately L = 1 fb −1 . The center-of-mass energy of the pp collisions was √ s = 7 TeV.

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The reflectance of freshly cleaved single crystals of KCI, KBr, and K I has been measured for 15" angle of incidence a t room temperature for photon energies between 5 and 35 eV, using the continuous spectrum of synchrotron radiation. For photon energies from 12 t o 30eV the optical constants, the dielectric constant, and the energy loss function were determined by reflectance measurements with parallel polarized light a t several angles of incidence between 15' and 75". A prominent doublet near 20 eV is found for all potassium halides. It is assigned to excitonic transitions from the K+3p core level to the conduction band a t r a n d X . Energy differences between some critical points a t T and X are estimated

The spectral distribution of the photocurrent at different retarding potentials as well as the energy distribution of the photoelectrons a t a fixed photon energy have been measured for all potassium halides. The synchrotron radiation of DESY was used as a light source. The samples were thin films evaporated under ultra-high vacuum. The threshold energy, the distance between the valence band and the K+3p core level, and the position of the Fermi level have been determined. The onset of electron-electron scattering and the appearence of inelastically scattered electrons in the photoemission has been demonstrated. The decay of the core excitons has been investigated. The core exciton structure in the spectra of the photoyield is due t o direct recombination. There is some evidence that a n Auger process occurs as additional decay mechanism.Die Spektralverteilung des Photostroms bei verschiedenen Retardierungspotentialen sowie die Energieverteilung der Photoelektronen zu fester Photonenenergie wurden fur alle Kaliumhalogenide gemessen. Als Lichtquelle diente die Synchrotronstrahlung von DESY. Als Proben wurden dunne, im Ultrahochvakuum aufgedampfte Schichten verwendet. Die Grenzwellenlange, der energetische Abstand zwischen dem Valenzband und dem K+3p-Rumpfniveau sowie die Lage des Ferminiveaus wurden bestimmt. Der Einsatz der Elektron-Elektron-Streuung und das Auftreten von unelastisch gestreuten Elektronen in der Photoemission wurden nachgewiesen. Der Zerfall der Rumpfexzitonen wurde untersucht.

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