Abstract:

The Hadronic Calorimeter (HCAL) in the CMS experiment at the Large Hadron Collider (LHC) at CERN has been designed to measure the energy of jets which are the signature of quark and gluons produced in strong interactions. The jet measurements is the crucial importance for both detector performance and studies Standard Model (SM) and Beyond the Standard Model (BSM) physics analyses such as supersymetry (SUSY), Higgs boson and heavy gauge boson researches. The other important feature of jet measurements is that it tests the performance of simulated proton-proton (pp) collision data produced with Monte Carlo (MC) simulations. Precise and accurate measurement of jets of great importance in HCAL especially in central region of the calorimeter (|η|<3.0) and concerns many physics analyzes performed in the CMS experiment. Very large aberrant GeV-TeV scale noise is detected in the Hadronic Barrel (HB)and Hadronic Endcap (HE) sub-detectors located in the central area of HCAL, and it was understood that these GeV-TeV scale noise is not caused by pedestal and other noises. The GeV-TeV scale noise is due to the Front-End Readout Systems in the HB and HE calorimeters. The characteristics and analysis of the noise originating from the GeV-TeV scale Front-End Readout Systems in the HB and HE calorimeters are presented in this study for both 0 "T" and 3.8 T magnetic field.