Open Journal of Microphysics, 2014, 4, 35-45 Published Online November 2014 in SciRes. http://www.scirp.org/journal/ojm http://dx.doi.org/10.4236/ojm.2014.44006 How to cite this paper: Bakhet, N., Khlopov, M.Y. and Hussein, T. (2014) Search for Signatures of New Heavy Top Quark of the Fourth Generation at the Hadron Colliders. Open Journal of Microphysics, 4, 35-45. http://dx.doi.org/10.4236/ojm.2014.44006 Search for Signatures of New Heavy Top Quark of the Fourth Generation at the Hadron Colliders Nady Bakhet 1,2 , Maxim Yu Khlopov 3,4 , Tarek Hussein 1 1 Department of Physics, Cairo University, Giza, Egypt 2 Egyptian Network of High Energy Physics-ASRT, Cairo, Egypt 3 APC Laboratory, IN2P3/CNRS, Paris, France 4 National Research Nuclear University “MEPHI” (Moscow Engineering Physics Institute), Moscow, Russia Email: nady.bakhet@cern.ch Received 13 August 2014; revised 12 September 2014; accepted 12 October 2014 Copyright © 2014 by authors and Scientific Research Publishing Inc. This work is licensed under the Creative Commons Attribution International License (CC BY). http://creativecommons.org/licenses/by/4.0/ Abstract The Fourth Generation and Vector Like Quark (VLQ) models are extensions of the Standard Model of particles physics. These models predict the existence of new heavy quarks like heavy top quark ′ t with electric charge 2/3 and heavy bottom quark ′ b with electric charge −1/3. The ′ t and ′ b will act the fourth generation quarks. In current work we present a search for a pair production ′′ tt of a fourth generation quark, ′ t quark and its antiparticle, followed by their decays to Z , W bosons followed by decays to trilepton − − ee + μ plus jets and missing transverse energy in the final state according to the process ( ) − − → → → ′′ → ee + + μ tt pp p ZtW b ZW bW b μν budb − − . We use Monte Carlo simulation techniques Pythia8, MadGraph5 and CalcHEP to simulate this process at both the Large Hadron Collider at CERN (proton-proton collisions) and the Fermilab Tevatron Col- lider (proton-antiproton collisions). We assume that the ′ t quark is a narrow state that always decay to a W and Z bosons plus jets. We select 2 electrons + jets+ missing energy final states with one isolated μ with high transverse momentum. The three charged leptons plus missing energy in the final state offer the best discovery potential at the hadron colliders for new heavy top quark mass of 500 GeV. We study the possible signals at both the LHC and the Tevatron of new quarks ′ t coupled to the third generation quarks in the context of fourth generation and vector like quark models under the assumption of a branching ratios ( ) ′→ 50% BR t Wb = and ( ) ′→ 50% BR t Zt = . Heavy quark pair production gives interesting signals in final states with three charged leptons plus missing energy. Finally, from our analysis the new heavy fourth gener- ation quark ′ t can be discovered at both the Tevatron and the LHC with mass 500 GeV.