Özet:
The hybrid photo diodes in the HCAL will play an important role in detection of the jets and missing energy. It is very important to understand and monitor their charge spectrum. The charge spectrum of the HPD detectors in the HB and HE with high statistics and their noise rate have been studied. In this study a method to monitor the HPD charge spectrum was developed. The relation between jets and electron reconstruction efficiency is quite important. The jets in the events may effect the reconstruction efficiency and quality of the electron reconstruction. The analysis showed that for each increase in the number of jets the efficiency of electrons decrease by about 1-7%. SUSY is a symmetry relating the standard model particles to their superpartners. It must be a broken symmetry since no supersymmetric particle has been observed yet. A constrained model of SUSY breaking, mSUGRA predicts experimental signals in the CMS detector for detecting the evidence for SUSY. One of these, dielectron with large missing energy and jets is studied with MC simulation. It is shown that SUSY can be discovered with 1 fb-1 data at ps = 10 TeV. Different clustering algorithms for the jets and missing energy are used and compared for the best result.
