7,841 research outputs found
Emitter Location Finding using Particle Swarm Optimization
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
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
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
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 fb 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
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
A study of single top quark production via flavor changing neutral current
interactions at vertices is performed at future circular hadron
electron collider. The signal cross sections for the processes and in the collision of electron
beam with energy 60 GeV and proton beam with energy 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 mass are used to count signal and background events
after all selection cuts. The upper limits on the anomalous flavor changing
neutral current couplings are found to be 0.01 at
future circular hadron electron collider for fb with the
fast simulation of detector effects. Signal significance depending on the
couplings is analyzed and an enhanced sensitivity is found to the
branching ratio BR() 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.
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