Fourth Family Quarks research at LHC-ATLAS experiment

In this study, Standard Model fourth family quarks and its mass range that will be studied at LHC ATLAS experiment was studied.Presences of the Fourth Standard Model Family Fermions contribute presence of Higgs range and Higss boson which is known as origin of matter at the present day.Methodology for Standard Model fourth family fermions? is based on simulation studies. These studies were performed using High Energy Physics program CalcHEP. In the study, fourth family fermions (pp ? u4,X or pp ? d4,X channels) productions, decay widhts and branching ratios were calculated using the CalcHEP program . In addition, theoretical proof of necessity of fourth family was presented using Langrangian that explains fourth family fermion equation of motions.The single production of fourth family quarks through the process at the Large Hadron Collider (LHC) has been studied. The decay widths and branching ratios of the fourth family quarks ( and ) in the mass range 300-800 GeV has been calculated. The cross sections for the signal and background processes have been calculated in the Monte Carlo framework. It is shown that the LHC can substantially discover single and quarks if the CKM matrix elements .