Browsing by Author "Cakir, O, Cakir, IT, Senol, A, Tasci, AT"

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Anomalous single production of fourth family up-type quark associated with neutral gauge bosons at the LHC
(2012-05-01) Çakr O., Çakr I.T., Senol A., Tasci A.T.; Cakir, O, Cakir, IT, Senol, A, Tasci, AT
The fourth family quarks are expected to have mass larger than the top quark considering the results from recent studies on the allowed parameter space. They could also have different dynamics than the quarks of three families of the standard model. The single production of the fourth family up-type quark t is studied via the anomalous production process pp → t′VX (where V = g, Z, γ) at the LHC with the center of mass energy of 7 and 14TeV. The signatures of such process are discussed within both the SM and the anomalous decay modes of t quarks. The sensitivity to anomalous coupling κ/Λ = 0.004TeV -1 can be reached at TeV and L int = 100 pb 1. © 2012 IOP Publishing Ltd.
Search for top quark FCNC couplings in Z'models at the LHC and CLIC
(2010-11-01) Çakir O., Çakir I.T., Senol A., Tasci A.T.; Cakir, O, Cakir, IT, Senol, A, Tasci, AT
The top quark is the heaviest particle to date discovered, with a mass close to the electroweak symmetry breaking scale. It is expected that the top quark would be sensitive to the new physics at the TeV scale. One of the most important aspects of the top quark physics can be the investigation of the possible anomalous couplings. Here, we study the top quark flavor changing neutral current (FCNC) couplings via the extra gauge boson Z' at the Large Hadron Collider (LHC) and the Compact Linear Collider (CLIC) energies. We calculate the total cross sections for the signal and the corresponding Standard Model (SM) background processes. For an FCNC mixing parameter x=0.2 and the sequential Z' mass of 1 TeV, we find the single top quark FCNC production cross sections 0.38(1.76) fb at the LHC with Spp= 7(14)TeV, respectively. For the resonance production of sequential Z′ boson and decays to single top quark at the Compact Linear Collider (CLIC) energies, including the initial state radiation and beamstrahlung effects, we find the cross section to be 27.96(0.91) fb at Se+e- = 1(3) TeV, respectively. We make the analysis to investigate the parameter space (mixing-mass) through various Z′ models. It is shown that the results benefit from the flavor tagging. © 2010 Springer-Verlag / Società Italiana di Fisica.