7,454 research outputs found

    Emitter Location Finding using Particle Swarm Optimization

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    Using several spatially separated receivers, nowadays positioning techniques, which are implemented to determine the location of the transmitter, are often required for several important disciplines such as military, security, medical, and commercial applications. In this study, localization is carried out by particle swarm optimization using time difference of arrival. In order to increase the positioning accuracy, time difference of arrival averaging based two new methods are proposed. Results are compared with classical algorithms and Cramer-Rao lower bound which is the theoretical limit of the estimation error

    Resonant production of the fourth family slepton at the LHC

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    The resonant production of the fourth family slepton ~l_4 via R-parity violating interactions of supersymmetry at the Large Hadron Collider has been investigated. We study the decay mode of ~l_4 into the fourth family neutrino nu_4 and W boson. The signal will be a like-sign dimuon and dijet if the fourth family neutrino has Majorana nature. We discuss the constraints on the R-parity violating couplings lambda and lambda' of the fourth family charged slepton at the LHC with the center of mass energies of 7, 10 and 14 TeV.Comment: 8 pages, 4 figures, 4 table

    Anomalous resonant production of the fourth family up type quarks at the LHC

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    Considering the present limits on the masses of fourth family quarks from the Tevatron experiments, the fourth family quarks are expected to have mass larger than the top quark. Due to their expected large mass they could have different dynamics than the quarks of three families of the Standard Model. The resonant production of the fourth family up type quark t' has been studied via anomalous production subprocess gq_i-->t' (where q_i=u,c) at the LHC with the center of mass energy 10 TeV and 14 TeV. The signatures of such process are discussed within the SM decay modes. The sensitivity to anomalous coupling \kappa/\Lambda=0.1 TeV^(-1) can be reached at \sqrt{s}=10 TeV and L_int=100 pb^(-1).Comment: 14 pages, 13 figures, 7 table

    Probing Charged Higgs Boson Couplings at the FCC-hh Collider

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    Many of the new physics models predicts a light Higgs boson similar to the Higgs boson of the Standard Model (SM) and also extra scalar bosons. Beyond the search channels for a SM Higgs boson, the future collider experiments will explore additional channels that are specific to extended Higgs sectors. We study the charged Higgs boson production within the framework of two Higgs doublet models (THDM) in the proton-proton collisions at the FCC-hh collider. With an integrated luminosity of 500 fb1^{-1} at very high energy frontier, we obtain a significant coverage of the parameter space and distinguish the charged Higgs-top-bottom interaction within the THDM or other new physics models with charged Higgs boson mass up to 1 TeV.Comment: 22 pages, 26 figures, 6 table

    Effects of the FCNC couplings in production of new heavy quarks within Z' models at the LHC

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    We study the flavor changing neutral current couplings of new heavy quarks through the Z' models at the LHC. We calculate the cross sections for the signal and the corresponding standard model background processes. Considering the present limits on the mass of new heavy quarks and the Z' boson, we performed an analysis to investigate the parameter space (mixing and mass) through different Z' models. For an FCNC mixing parameter x=0.1 and the Z' mass M_{Z'}=2000 GeV, and new heavy quark mass m_{t'}=700 GeV at the LHC with \sqrt{s}=13 TeV, we find the cross section for single production of new heavy quarks associated with top quarks as 5.8 fb, 3.3 fb, 1.5 fb and 1.2 fb within the Z'_{\eta} , Z'_{\psi} , Z'_{LP} and Z'_{\chi} models, respectively. It is shown that the sensitivity would benefit from the flavor tagging.Comment: 17 pages, 18 figures, update. arXiv admin note: text overlap with arXiv:1003.315

    Top quark FCNC couplings at future circular hadron electron colliders

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    A study of single top quark production via flavor changing neutral current interactions at tqγtq\gamma vertices is performed at future circular hadron electron collider. The signal cross sections for the processes epeW±q+Xe^{-}p\to e^{-}W^{\pm}q+X and epeW±bq+Xe^{-}p\to e^{-}W^{\pm}bq+X in the collision of electron beam with energy Ee=E_e= 60 GeV and proton beam with energy Ep=E_p= 50 TeV are calculated. In the analysis, the invariant mass distributions of three jets reconstructing top quark mass, requiring one b-tagged jet and other two jets reconstructing the WW mass are used to count signal and background events after all selection cuts. The upper limits on the anomalous flavor changing neutral current tqγtq\gamma couplings are found to be λq<\lambda_q < 0.01 at future circular hadron electron collider for Lint=100L_{int}=100 fb1^{-1} with the fast simulation of detector effects. Signal significance depending on the couplings λq\lambda_q is analyzed and an enhanced sensitivity is found to the branching ratio BR(tqγt\to q\gamma) at the future circular hadron electron collider when compared to the current experimental results.Comment: 11 pages, 4 Figures, 4 Tables, to appear in Phys. Rev.