Standart olmayan ek parçacıklarla standart model ötesi fiziğin gelecek çarpıştırıcılarda araştırılması

This thesis is based on work done in three different problems related with additional non-standard particles in framework ofphysics beyond the standard model:In the first problem, we investigate the production of fourth family up-type quarks using effective Lagrangian approach at futurelepton-hadron colliders and study the kinematical characteristics of the signal with an optimal set of cuts. We obtain the upper mass limits 500 GeV at THERA and one TeV at Linac $\otimes$ LHC.In the second problem, we investigate the single production and decay of charge -1/3 ,weak isosinglet vectorlike exotic $D$ quarks in string inspired $E_6$ theories at future ep colliders; THERA with $\sqrt s$=1 TeV, $L=40$ $pb^{-1}$ and CERN Large Hadron Electron Collider (LHeC) with $\sqrt s$=1.4 TeV, $L=10^4$ $pb^{-1}$. We found that an analysis of the decay modes of $D$ should probe the mass ranges of 100-450 GeV and 100-1200 GeV at the center of mass energies, 1 and 1.4 TeV , respectively.In the last problem, we examine the possible single and pair production of a heavy neutrino ($\nu_4$) in $ep$, $pp(p\bar p)$ and$e^-e^+$ collisions in the context of a new $e\nu_4 W$ and $\nu_4\bar{\nu_4}Z$ anomalous magnetic dipole moment typeinteractions and analyze the background using optimal cuts. We have obtained the mass limits of 700 GeV for THERA ($\sqrt s$=1 TeV), 2.8 TeV for LC$\otimes$ LHC ($\sqrt s$=3.74 TeV) and 2 TeV at Large Hadron Collider (LHC). At ILC options $\sqrt s=0.5$ and 1 TeV these limits are 450 and 950 GeV, respectively.