Browsing by Author "Senol A."
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Scopus Analyzing the anomalous dipole moment type couplings of heavy quarks with FCNC interactions at the CLIC(2014-01-01) Tasci A.T.; Senol A.; Verep C.We examine both anomalous magnetic and dipole moment type couplings of a heavy quark via its single production with subsequent dominant standard model decay modes at the compact linear collider (CLIC). The signal and background cross sections are analyzed for heavy quark masses 600 and 700 GeV. We make the analysis to delimitate these couplings as well as to find the attainable integrated luminosities for 3 σ observation limit. © 2014 A. T. Tasci et al.Publication Anomalous Higgs couplings at the LHeC(2013-08-11) Senol A.; Senol, AThe discovery of Higgs boson plays a crucial role in understanding the electroweak symmetry breaking sector. From now on, solving the dynamics of this sector needs precision measurements of the couplings of the Higgs boson to the Standard Model particles. In this work, we investigate the constrains on the anomalous HWW and HWWγ couplings, described by the dimension-six operators in the effective Lagrangian, in a high energy envisaged ep collider which is called Large Hadron electron Collider (LHeC). We obtained the 95% confidence level limits on the couplings of anomalous HWW and HWWγ vertex, with the design luminosity of 10fb-1 and electron beam energy of 140 GeV, through ep→νH+X, γp→WH+X and eγ→WHν processes by considering the new physics energy scale to be Λ=1TeV. The sensitivity of the LHeC to the new physics scale is also briefly discussed. © 2013 Elsevier B.V.Scopus Anomalous Higgs couplings at the LHeC(2013-08-11) Senol A.The discovery of Higgs boson plays a crucial role in understanding the electroweak symmetry breaking sector. From now on, solving the dynamics of this sector needs precision measurements of the couplings of the Higgs boson to the Standard Model particles. In this work, we investigate the constrains on the anomalous HWW and HWWγ couplings, described by the dimension-six operators in the effective Lagrangian, in a high energy envisaged ep collider which is called Large Hadron electron Collider (LHeC). We obtained the 95% confidence level limits on the couplings of anomalous HWW and HWWγ vertex, with the design luminosity of 10fb-1 and electron beam energy of 140 GeV, through ep→νH+X, γp→WH+X and eγ→WHν processes by considering the new physics energy scale to be Λ=1TeV. The sensitivity of the LHeC to the new physics scale is also briefly discussed. © 2013 Elsevier B.V.Scopus Anomalous HZγ couplings in photon-induced collisions at the LHC(2014-11-30) Senol A.; Tasci A.T.; Cakir I.T.; Cakir O.We examined HZγ vertex and obtained the limits on anomalous aγ, bγ and bγ couplings in a model-independent way through the ?p collisions via the process pp → pγp → pHqX. The sensitivities to the anomalous couplings can be obtained as |bγ|, | bγ| 10-3 for the integrated luminosity of Lint = 100 fb-1 at the LHC with √s = 13 TeV.Publication Anomalous quartic WW λ λ and ZZλ λ couplings in γp collision at the LHC(2014-10-20) Senol A.; Senol, AWe analyze the anomalous quartic gauge boson couplings WW λ λand ZZ, λ λ described by dimension-six effective quartic Lagrangian at the LHC. The sensitivities to anomalous quartic gauge couplings aW,Z 0,c /δ2 by examining the two different photon-induced processes pp → pγp → pWqX and pγp → pp → pZZqX with W and Z's decaying leptonically are investigated. We show that p mode of photon-induced reactions at the LHC are able to probe these couplings to the order of 10-6-10-7 GeV-2 at 95% confidence level (C.L.) with √s = 14 TeV and for proton-proton luminosities in the range of 30-200 fb-1.Scopus Anomalous quartic WW λ λ and ZZλ λ couplings in γp collision at the LHC(2014-10-20) Senol A.We analyze the anomalous quartic gauge boson couplings WW λ λand ZZ, λ λ described by dimension-six effective quartic Lagrangian at the LHC. The sensitivities to anomalous quartic gauge couplings aW,Z 0,c /δ2 by examining the two different photon-induced processes pp → pγp → pWqX and pγp → pp → pZZqX with W and Z's decaying leptonically are investigated. We show that p mode of photon-induced reactions at the LHC are able to probe these couplings to the order of 10-6-10-7 GeV-2 at 95% confidence level (C.L.) with √s = 14 TeV and for proton-proton luminosities in the range of 30-200 fb-1.Scopus 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.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.Scopus Anomalous single production of fourth generation t' quarks at ILC and CLIC(2011-10-11) Senol A.; Tasci A.T.; Ustabas F.We present a detailed study of the anomalous single fourth generation t' quark production within the dominant Standard Model (SM) decay modes at future e+e- colliders. We calculate the signal and background cross sections in the mass range 300-800 GeV. We also discuss the limits of t'q' and t'qZ (q=u,c) anomalous couplings as well as values of attainable integrated luminosity for 3. σ observation limit. © 2011 Elsevier B.V.Scopus Associated production of different flavor heavy quarks through W bosons at the LHC(2013-02-01) Cakir I.T.; Senol A.; Tasci A.T.Associated production of different flavor heavy quarks can provide a probe for W' bosons at the LHC. We study pp → t'b̄' X process with the subsequent decays t' → W+b and b̄' → W -W+b̄, and compare the results with the tb̄ final state. The effects of the W' boson to the different flavor pair production cross section are shown to be important in some parameter region for the heavy quark masses of 600 and 700 GeV. We present accessible mass limits for the W' boson at the LHC with √s = 14 TeV.Scopus Associated production of single top quark and W boson through anomalous couplings at LHeC based γp colliders(2014-02-10) Cakir I.T.; Senol A.; Tasci A.T.We consider the production of a single top quark in association with a W boson at LHeC based γp collider. We compute the cross-section for the process γp→WtX with the anomalous Wtb and Wtbγ couplings. We find that the sensitivities to anomalous couplings of top quark are shown to be comparable, even better than the ones obtained from direct searches at hadron colliders. © 2014 World Scientific Publishing Company.Scopus Effect of annealing time on the structural, optical and electrical characteristics of DC sputtered ITO thin films(2014-10-01) Senol S.D.; Senol A.; Ozturk O.; Erdem M.Using an Indium tin oxide (ITO) ceramic target (In2O3:SnO2, 90:10 wt%), ITO thin films were deposited by conventional direct current magnetron sputtering technique onto glass substrates at room temperature. The obtained ITO films were annealed at 400 °C for different annealing times (1, 2, 5, 7, and 9 h). The effect of annealing time on their structural, optical and electrical properties was investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microcopy (AFM), ultra violet–visible (UV–Vis) spectrometer, and temperature dependence Hall measurements. XRD data of obtained ITO films reveal that the films were polycrystalline with cubic structure and exhibit (222), (400) and (440) crystallographic planes of In2O3. AFM and Scanning Electron Microscopy SEM have been used to probe the surface roughness and the morphology of the films. The refractive index (n), thickness and porosity (%) of the films were evaluated from transmittance spectra obtained in the range 350–700 nm by UV–Vis. The optical band gap of ITO film was found to be varying from 3.35 to 3.47 eV with the annealing time. The annealing time dependence of resistivity, carrier concentration, carrier mobility, sheet resistance, and figure of merit values of the films at room temperature were discussed. The carrier concentration of the films increased from 1.21 × 1020 to 1.90 × 1020 cm−3, the Hall mobility increased from 11.38 to 18 cm2 V−1 s−1 and electrical resistivity decreased from 3.97 × 10−3 to 2.13 × 10−3 Ω cm with the increase of annealing time from 1 to 9 h. Additionally, the temperature dependence of the carrier concentration, and carrier mobility for the as-deposited and 400 °C annealed ITO films for 2 and 9 h were analysed in the temperature range of 80–350 K.Scopus Probing anomalous hzz couplings at the lhec(2013-10-10) Çakir I.T.; Çakir O.; Senol A.; Tasci A.T.We examine the sensitivity to anomalous couplings of the Higgs boson to neutral gauge bosons in a model-independent way at the Large Hadron electron Collider (LHeC). We have obtained the constraints on anomalous couplings for HZZ vertex via the process e-p→e-HqX. We find the accessible limits on the CP-conserving coupling bZ as (-0.12,0.43) and (-0.10,0.33), while the limits on CP-violating coupling βZ as (-0.32,0.32) and (-0.24,0.24) at the electron beam energy Ee = 60 GeV and Ee = 140 GeV, respectively. © 2013 World Scientific Publishing Company. © World Scientific Publishing Company.Scopus Search for anomalous WWγ and WWZ couplings with polarized E-beam at the LHeC(2014-10-01) Cakir I.T.; Cakir O.; Senol A.; Tasci A.T.We examine the possibility of constraining the anomalous WWγ and WWZ couplings by measuring total cross sections of the ep → νeqγX and ep → νeqZX processes at the LHeC collider with the electron beam energy Ee = 60 GeV and Ee = 140 GeV. We consider the cases of unpolarized and polarized electron beams. The difference of the upper and lower bounds on the anomalous couplings, (δ Δκγ,δλγ) and (δ Δκz,δλz) are obtained as (0:990, 0:122) and (0:362, 0:012) without electron beam polarization at the beam energy of Ee = 140 GeV for an integrated luminosity of Lint = 100 fb-1, respectively. With the possibility of e-beam polarization, we obtain more improved results as (0:975, 0:118) and (0:285, 0:009) for (δ Δκγ,δλγ) and (δ Δκz,δλz), respectively. The results are found to be comparable with the current experimental limits obtained from two-parameter fits to the data collected in the lepton and hadron colliders. It is found that the limits on the anomalous couplings (Δκz,δλz) through the process ep → νeqZX at the LHeC can further improve the current experimental limits.Scopus Search for electromagnetic properties of the neutrino in γe and γγ collisions at CLIC(2012-06-25) Senol A.We have examined nonstandard γνν̄ and γγν ν̄ couplings via νν̄ production in eγ and γγ collisions at the Compact Linear Collider (CLIC). We obtain 95% confidence level bounds on γνν̄ and γγνν ̄ couplings by considering the backscattered photon distribution function for incoming photons and initial state radiation and beamstrahlung effect for initial state electrons in the eγ and γγ collider modes of the linear collider. We indicate that the reaction γγ→νν ̄ provides more than 15 orders of magnitude improvement in neutrino-two photon couplings compared to LEP limits. © 2012 American Physical Society.Publication Search for electromagnetic properties of the neutrino in γe and γγ collisions at CLIC(2012-06-25) Senol A.; Senol, AWe have examined nonstandard γνν̄ and γγν ν̄ couplings via νν̄ production in eγ and γγ collisions at the Compact Linear Collider (CLIC). We obtain 95% confidence level bounds on γνν̄ and γγνν ̄ couplings by considering the backscattered photon distribution function for incoming photons and initial state radiation and beamstrahlung effect for initial state electrons in the eγ and γγ collider modes of the linear collider. We indicate that the reaction γγ→νν ̄ provides more than 15 orders of magnitude improvement in neutrino-two photon couplings compared to LEP limits. © 2012 American Physical Society.Scopus 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.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.Scopus Searching for Single Production of Charged Heavy Leptons via Anomalous Interactions at CLIC(2013-01-01) Tasci A.T.; Senol A.We consider the possible discovery potential for single production of charged heavy leptons via anomalous interactions at the envisaged compact linear collider by taking into account initial state radiation and beamstrahlung effects. We calculate the production cross sections and decay widths of charged heavy leptons in the context of anomalous interactions at center of mass energies √s = 1 and 3 TeV. The signal and corresponding backgrounds are studied in detail for the mass range 300-1900 GeV. © 2012 King Fahd University of Petroleum and Minerals.Scopus Single production of fourth-family t′ quarks at the CERN large hadron electron collider(2009-11-09) Cakir O.; Senol A.; Tasci A.T.We study the electroweak single production of fourth-family t′ quarks via the process ep→t′ν at the Large Hadron electron Collider (LHeC). We calculate the background and signal cross-sections for the mass range 300-800 GeV. It is shown that the LHeC can discover a single t′ quark up to the mass of 750 GeV for the optimized mixing parameters. Copyright © 2009 EPLA.Scopus Theoretical investigations of α,α,α-trifluoro-3, -p and o-nitrotoluene by means of density functional theory(2012-01-01) Yildirim G.; Senol S.; Dogruer M.; Ozturk O.; Senol A.; Tasci A.; Terzioglu C.This study reports the optimized molecular structures, vibrational frequencies including Infrared intensities and Raman activities, corresponding vibrational assignments, 1H and 13C NMR chemical shifts, the magnitudes of the JCH and JCC coupling constants, Ultraviolet-visible (UV-vis) spectra, thermodynamic properties and atomic charges of the title compounds, α,α,α-trifluoro-3, -p and o-nitrotoluene, in the ground state by means of the density functional theory (DFT) with the standard B3LYP/6-311++G(d,p) method and basis set combination for the first time. Theoretical vibrational spectra were interpreted by normal coordinate analysis based on scaled density functional force field. The results show that the vibrational frequencies and chemical shifts calculated were obtained to be in good agreement with the experimental data. Based on the comparison between experimental results and theoretical data, the calculation level chosen is powerful approach for understanding the identification of all the molecules studied. In addition, not only were frontier molecular orbitals (HOMO and LUMO), molecular electrostatic potential (MEP) and electrostatic potential (ESP) simulated but also the dipole moment, softness, electronegativity, chemical hardness, electrophilicity index, transition state and energy band gap values were predicted. According to the investigations, all compounds were found to be useful to bond metallically and interact intermolecularly; however, the thermodynamic properties confirm that the α,α,α-trifluoro-p- nitrotoluene was more reactive and more polar than the others. © 2011 Elsevier B.V. All rights reserved.Scopus ZZγ and Zγγ anomalous couplings in γp collision at the LHC(2013-04-08) Senol A.We study the sensitivity of anomalous ZZγ and Zγγ vertex couplings h3γ,Z and h4γ,Z, which would be a powerful sign of new physics, via the subprocess γq→Zq of the main reaction pp→pγp→ZqX at the LHC. We calculated limits on these couplings at 95% confidence level for various values of integrated luminosity. It is shown that the pp→pγp→ZqX reaction provides 1 order of magnitude improvement in the couplings h4γ,Z compared to the current experimental limits obtained in events dominated by Zγ production from the LHC and Tevatron. © 2013 American Physical Society.