arXiv subjects
Publications and source records attributed to A. Senol.
We have examined $HZγ$ vertex to obtain the limits on anomalous $a_γ$, $b_γ$ and $\tilde b_γ$ couplings in a model independent way through the $γp$ collisions via the process $pp\to p γp\to pHqX$. The sensitivities to the anomalous couplings can be obtained as $|b_γ|$, $|\tilde{b}_γ|\sim 10^{-3}$ for the integrated luminosity of $L_{int}=100 ~\mathrm{fb}^{-1}$ at the LHC with $\sqrt{s}=14$ TeV.
In this study 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 or 3$σ$ observation limit.
We examine the sensitivity to the 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 $e^{-}p\rightarrow e^{-}HqX$. We find the accessible limits of the anomalous coupling $b_{Z}$ as $(-0.12,0.43)$ and $(-0.10,0.33)$, while the limits on coupling $β_{Z}$ as ($-0.32,0.32$) and $(-0.24,0.24)$ at the electron beam energy $E_{e}=60$ GeV and $E_{e}=140$ GeV, respectively.
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 $γp\rightarrow WtX$ 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.
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 10 fb$^{-1}$ and electron beam energy of 140 GeV, through $ep\to νH +X$, $γp\to W H +X$ and $eγ\to W H ν$ processes by considering the new physics energy scale to be $Λ$= 1 TeV. The sensitivity of the LHeC to the new physics scale is also briefly discussed.
We study the sensitivity of anomalous $ZZγ$ and $Zγγ$ vertex couplings $h_3^{γ,Z}$ and $h_4^{γ,Z}$, which would be powerful sign of new physics, via the subprocess $γq\to Z q$ of the main reaction $pp\to pγp\to Z q X$ at the LHC. We calculated limits on these couplings at 95% confidence level for various values of integrated luminosity. It is shown that the $pp\to pγp\to Z q X$ reaction provides one order of magnitude improvement in the couplings $h_4^{γ,Z}$ compared to the current experimental limits obtained in events dominated by $Zγ$ production from the LHC and Tevatron.
Associated production of different flavor heavy quarks can provide a probe for $W'$ bosons at the LHC. We study $pp\to t'\bar{b'}X$ process with the subsequent decays $t'\to W^+b$ and $\bar{b'}\to W^-W^+\bar b$, and compare the results with the $t\bar{b}$ 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 $\sqrt s$=14 TeV.
We consider the possible discovery potential for single production of charged heavy leptons via anomalous interactions at the envisaged Compact Linear Collider (CLIC) by taking into account initial state radiation (ISR) 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 $\sqrt{s}=1$ and 3 TeV. The signal and corresponding backgrounds are studied in detail for the mass range 300-1900 GeV.
We have examined nonstandard $γν\barν$ and $γγν\barν$ couplings via $ν\barν$ production in a $eγ$ and $γγ$ collisions at the CLIC. We obtain 95% confidence level bounds on $γν\barν$ and $γγν\barν$ couplings by considering the backscattered photon distribution function for incoming photons and Initial State Radiation (ISR) and Beamstrahlung (BS) effect for initial state electrons in the $eγ$ and $γγ$ collider modes of linear collider. We indicate that the reaction $γγ\toν\barν$ provides more than 15 orders of magnitude improvement in neutrino-two photon couplings compared to LEP limits.
From the present limits on the masses and mixings of fourth family quarks, they are expected to have mass larger than the top quark and allow a large range of mixing of the third family. 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' has been studied via anomalous production process pp-> t'VX (where V=g,Z,γ) at the LHC with the center of mass energy of 7 and 14 TeV. The signatures of such process are discussed within both the SM decay modes and anomalous decay modes of t' quarks. The sensitivity to anomalous coupling kappa/Lambda=0.004 TeV^(-1) can be reached at sqrt(s)=14 TeV and L_(int)=100 pb^(-1).
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 $t'qγ$ and $t'qZ$ ($q=u,c$) anomalous couplings as well as values of attainable integrated luminosity for 3$σ$ observation limit.
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 sqrt{s_{pp}}=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 27.96(0.91) fb at sqrt{s_{e^{+}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.
We study the single production of fourth-family $t'$ quarks via the process $ep\to t'ν$ at 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 single $t'$ quark up to the mass of 800 GeV for the optimized mixing parameters.
We study the single production of top quarks in $e^+e^-, ep$ and $pp$ collisions in the context of unparticle physics through the Flavor Violating (FV) unparticle vertices and compute the total cross sections for single top production as functions of scale dimension $d_{\U}$. We find that among all, LHC is the most promising facility to probe the unparticle physics via single top quark production processes.
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.
We investigate the production of fourth generation neutrino in the context of new $e ν_4 W$ magnetic dipole moment type interaction in $ep$ collisions at the future lepton-hadron colliders. We have obtained the mass limits of 700 GeV for THERA ($\sqrt S$=1 TeV) and 2.8 TeV for LC$\otimes$ LHC ($\sqrt S$=3.74 TeV).
We investigate the production of fourth family up-type quarks using effective lagrangian approach at future lepton-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.
CP violating effects in the single top quark production via flavour changing neutral current (FCNC) reactions $e^+e^- ->t bar{q}$ and $e^+e^- ->bar{t}q$ (here $q$ refers to charm and up quarks) are studied. The effective Lagrangian description of the FCNC interactions is used. A numerical analysis is performed for some next linear colliders. CP violating asymmetries for the number of $q$ and $\bar{q}$ quarks are obtained to be of order $10^{-2}-10^{-3}$ depending on the CM energy.