The Experts below are selected from a list of 7728 Experts worldwide ranked by ideXlab platform

Fei Wang - One of the best experts on this subject based on the ideXlab platform.

  • Radiative natural SUSY spectrum from deflected AMSB scenario with messenger-matter interactions
    Journal of High Energy Physics, 2016
    Co-Authors: Fei Wang, Jin Min Yang, Yang Zhang
    Abstract:

    A radiative natural SUSY spectrum are proposed in the deflected anomaly mediation scenario with general messenger-matter interactions. Due to the contributions from the new interactions, positive slepton masses as well as a large |A t | term can naturally be obtained with either sign of Deflection Parameter and few messenger species (thus avoid the possible Landau pole problem). In this scenario, in contrast to the ordinary (radiative) natural SUSY scenario with under-abundance of dark matter (DM), the DM can be the mixed bino-higgsino and have the right relic density. The 125 GeV Higgs mass can also be easily obtained in our scenario. The majority of low EW fine tuning points can be covered by the XENON-1T direct detection experiments.

  • 750 GeV diphoton resonance, 125 GeV Higgs and muon g − 2 anomaly in deflected anomaly mediation SUSY breaking scenarios
    Physics Letters B, 2016
    Co-Authors: Fei Wang, Jin Min Yang, Mengchao Zhang
    Abstract:

    Abstract We propose to interpret the 750 GeV diphoton excess in deflected anomaly mediation supersymmetry breaking scenarios, which can naturally predict couplings between a singlet field and vector-like messengers. The CP-even scalar component ( S ) of the singlet field can serve as the 750 GeV resonance. The messenger scale, which is of order the gravitino scale, can be as light as F ϕ ∼ O ( 10 ) TeV when the messenger species N F and the Deflection Parameter d are moderately large. Such messengers can induce the large loop decay process S → γ γ . Our results show that such a scenario can successfully accommodate the 125 GeV Higgs boson, the 750 GeV diphoton excess and the muon g − 2 without conflicting with the LHC constraints. We also comment on the possible explanations in the gauge mediation supersymmetry breaking scenario.

  • Heavy colored SUSY partners from deflected anomaly mediation
    Journal of High Energy Physics, 2015
    Co-Authors: Fei Wang, Wenyu Wang, Jin Min Yang, Yang Zhang
    Abstract:

    We propose a deflected anomaly mediation scenario from SUSY QCD which can lead to both positive and negative Deflection Parameters (there is a smooth transition between these two Deflection Parameter regions by adjusting certain couplings). Such a scenario can naturally give a SUSY spectrum in which all the colored sparticles are heavy while the sleptons are light. As a result, the discrepancy between the Brookheaven g μ − 2 experiment and LHC data can be reconciled in this scenario. We also find that the Parameter space for explaining the g μ − 2 anomaly at 1σ level can be fully covered by the future LUX-ZEPLIN 7.2 Ton experiment.

  • Deflected anomaly mediated SUSY breaking scenario with general messenger–matter interactions
    Physics Letters B, 2015
    Co-Authors: Fei Wang
    Abstract:

    Abstract We propose to introduce general messenger–matter interactions in the deflected anomaly mediated SUSY breaking scenario. The most general form for the resulting soft Parameters is derived. New interference terms between the GMSB type and AMSB type contributions are the unique feature of this scenario. Messenger–matter interactions involving sleptons can be used to solve the tachyonic slepton problem and naturally lead to positive slepton masses regardless of the sign of Deflection Parameter. Besides, due to the new contributions, large | A t | that will not trigger color-breaking stop VEV are also possible in this scenario, thus can easily give the 125 GeV higgs which was discovered by LHC. This type of deflected AMSB scenario need very few messenger species, thus can avoid possible non-perturbative gauge couplings below the GUT scale (or Landau pole below the Planck scale).

Sonita Motaleb Faed - One of the best experts on this subject based on the ideXlab platform.

  • A computational study of a three-dimensional proton exchange membrane fuel cell (PEMFC) with conventional and deflected membrane electrode assembly
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: Nader Pourmahmoud, Sajad Rezazadeh, Iraj Mirzaee, Sonita Motaleb Faed
    Abstract:

    This article presents the results of a numerical investigation, using a comprehensive three-dimensional, single phase, non-isothermal and parallel flow model of a PEM fuel cell with deflected membrane electrode assembly (MEA). This numerical research has concentrated on the Deflection Parameter (δ) that affects this type of fuel cell performance. The model accounts simultaneously for electrochemical kinetics, current distribution, hydrodynamics, and multicomponent transport. A set of conservation equations valid for flow channels, gas-diffusion electrodes, catalyst layers, and the membrane region are developed and numerically solved using a finite-volumebased computational fluid dynamics technique. Because of importance of base model fuel cell (δ = 0), initially the CFD result of polarization curve has been validated with the available experimental data which shown good agreement. Introducing of Deflection Parameter as a criterion for creating of a new geometry, shown that fuel cell performance increases rather than base model, since the face width increases and more reactants diffuse through the gas diffusion layer (GDL) to the reacting area. Also, when this Parameter reaches to its maximum value equal to channel height, the fuel cell performance has been maximized in high current densities region. The further numerical results including of temperature distribution, oxygen, and water mass fraction in deflected membrane full cell are derived and discussed in the more details with respect to various values of Deflection Parameter. Finally, the obtained numerical results shown reasonable features in describing of deflected fuel cell behavior.

  • A computational study of a three-dimensional proton exchange membrane fuel cell (PEMFC) with conventional and deflected membrane electrode assembly
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: Nader Pourmahmoud, Sajad Rezazadeh, Iraj Mirzaee, Sonita Motaleb Faed
    Abstract:

    This article presents the results of a numerical investigation, using a comprehensive three-dimensional, single phase, non-isothermal and parallel flow model of a PEM fuel cell with deflected membrane electrode assembly (MEA). This numerical research has concentrated on the Deflection Parameter (δ) that affects this type of fuel cell performance. The model accounts simultaneously for electrochemical kinetics, current distribution, hydrodynamics, and multicomponent transport. A set of conservation equations valid for flow channels, gas-diffusion electrodes, catalyst layers, and the membrane region are developed and numerically solved using a finite-volumebased computational fluid dynamics technique. Because of importance of base model fuel cell (δ = 0), initially the CFD result of polarization curve has been validated with the available experimental data which shown good agreement. Introducing of Deflection Parameter as a criterion for creating of a new geometry, shown that fuel cell performance increases rather than base model, since the face width increases and more reactants diffuse through the gas diffusion layer (GDL) to the reacting area. Also, when this Parameter reaches to its maximum value equal to channel height, the fuel cell performance has been maximized in high current densities region. The further numerical results including of temperature distribution, oxygen, and water mass fraction in deflected membrane full cell are derived and discussed in the more details with respect to various values of Deflection Parameter. Finally, the obtained numerical results shown reasonable features in describing of deflected fuel cell behavior.

P.m. Stefan - One of the best experts on this subject based on the ideXlab platform.

  • Development of an in-vacuum minipole undulator.
    Journal of Synchrotron Radiation, 1998
    Co-Authors: T. Tanabe, X. Marechal, Takashi Tanaka, Hideo Kitamura, P.m. Stefan
    Abstract:

    An in-vacuum minipole (short-period) insertion device has been developed in a collaboration between SPring-8 and the National Synchrotron Light Source (NSLS). The magnetic arrays were constructed by SPring-8 and were installed in a chamber with mechanical parts in the X-ray ring (E = 2.584 GeV) at the NSLS in May 1997. The device is made of permanent magnets with 30.5 periods and a period length of 11 mm. It is designed to produce fundamental radiation at 4.6 keV, and, with a modest value of Deflection Parameter (K = 0.7 at 3.3 mm gap), enables higher harmonics to be used for a variety of experiments.

  • Development of an in-vacuum minipole undulator array for National Synchrotron Light Source In-Vacuum UNdulator
    Review of Scientific Instruments, 1998
    Co-Authors: T. Tanabe, X. Marechal, Takashi Tanaka, Hideo Kitamura, P.m. Stefan, G. Rakowsky, Samuel Krinsky, L. Solomon
    Abstract:

    An in-vacuum minipole (short period) insertion device has been developed in a collaboration between SPring-8 and the National Synchrotron Light Source (NSLS). The magnetic arrays were assembled, field measured, corrected, and vacuum tested by SPring-8 and were installed in an NSLS-developed chamber with mechanical parts in the NSLS X-Ray Ring (E=2.584 GeV) in May 1997 and a successful commissioning of the device was carried out in June 1997. The device is made of permanent magnets with 30.5 periods and a period length of 11 mm. It is designed to produce fundamental radiation at 4.6 keV, and with a modest value of Deflection Parameter (K=0.7 at 3.3& mm gap) enables higher harmonics to be used as well, for a variety of experiments. A detailed description of the mechanical support and vacuum chamber will be reported elsewhere. We describe technical challenges encountered in constructing this type of device, and present an outline of our collaboration.

  • Development of an in-vacuum minipole undulator
    Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167), 1
    Co-Authors: T. Tanabe, Hideo Kitamura, P.m. Stefan
    Abstract:

    An in-vacuum minipole insertion device is currently being developed in collaboration between and the National Synchrotron Light Source (NSLS). The magnetic array is constructed by SPring-8 and it will be installed in a chamber with mechanical parts in the X-ray ring (E=2.584 GeV) at the NSLS. The device is made of permanent magnets with 31 periods and the length of the period is 11 mm. It is to produce the fundamental radiation at 4.6 KeV which will be mainly used for X-ray photo-correlation spectroscopy (XPCS), and modest value of Deflection Parameter (K=0.7@3.3 mm gap) enables higher harmonics to be used for a variety of experiments. We describe technical difficulties of constructing this type of device as well as the outline of our collaboration.

Nader Pourmahmoud - One of the best experts on this subject based on the ideXlab platform.

  • A computational study of a three-dimensional proton exchange membrane fuel cell (PEMFC) with conventional and deflected membrane electrode assembly
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: Nader Pourmahmoud, Sajad Rezazadeh, Iraj Mirzaee, Sonita Motaleb Faed
    Abstract:

    This article presents the results of a numerical investigation, using a comprehensive three-dimensional, single phase, non-isothermal and parallel flow model of a PEM fuel cell with deflected membrane electrode assembly (MEA). This numerical research has concentrated on the Deflection Parameter (δ) that affects this type of fuel cell performance. The model accounts simultaneously for electrochemical kinetics, current distribution, hydrodynamics, and multicomponent transport. A set of conservation equations valid for flow channels, gas-diffusion electrodes, catalyst layers, and the membrane region are developed and numerically solved using a finite-volumebased computational fluid dynamics technique. Because of importance of base model fuel cell (δ = 0), initially the CFD result of polarization curve has been validated with the available experimental data which shown good agreement. Introducing of Deflection Parameter as a criterion for creating of a new geometry, shown that fuel cell performance increases rather than base model, since the face width increases and more reactants diffuse through the gas diffusion layer (GDL) to the reacting area. Also, when this Parameter reaches to its maximum value equal to channel height, the fuel cell performance has been maximized in high current densities region. The further numerical results including of temperature distribution, oxygen, and water mass fraction in deflected membrane full cell are derived and discussed in the more details with respect to various values of Deflection Parameter. Finally, the obtained numerical results shown reasonable features in describing of deflected fuel cell behavior.

  • A computational study of a three-dimensional proton exchange membrane fuel cell (PEMFC) with conventional and deflected membrane electrode assembly
    Journal of Mechanical Science and Technology, 2012
    Co-Authors: Nader Pourmahmoud, Sajad Rezazadeh, Iraj Mirzaee, Sonita Motaleb Faed
    Abstract:

    This article presents the results of a numerical investigation, using a comprehensive three-dimensional, single phase, non-isothermal and parallel flow model of a PEM fuel cell with deflected membrane electrode assembly (MEA). This numerical research has concentrated on the Deflection Parameter (δ) that affects this type of fuel cell performance. The model accounts simultaneously for electrochemical kinetics, current distribution, hydrodynamics, and multicomponent transport. A set of conservation equations valid for flow channels, gas-diffusion electrodes, catalyst layers, and the membrane region are developed and numerically solved using a finite-volumebased computational fluid dynamics technique. Because of importance of base model fuel cell (δ = 0), initially the CFD result of polarization curve has been validated with the available experimental data which shown good agreement. Introducing of Deflection Parameter as a criterion for creating of a new geometry, shown that fuel cell performance increases rather than base model, since the face width increases and more reactants diffuse through the gas diffusion layer (GDL) to the reacting area. Also, when this Parameter reaches to its maximum value equal to channel height, the fuel cell performance has been maximized in high current densities region. The further numerical results including of temperature distribution, oxygen, and water mass fraction in deflected membrane full cell are derived and discussed in the more details with respect to various values of Deflection Parameter. Finally, the obtained numerical results shown reasonable features in describing of deflected fuel cell behavior.

Eslley Scatena - One of the best experts on this subject based on the ideXlab platform.

  • Combining general relativity, massive QED and Very Long Baseline Interferometry to gravitationally constrain the photon mass
    Physics Letters A, 2010
    Co-Authors: Antonio Accioly, Jose Helayel-neto, Eslley Scatena
    Abstract:

    A constraint between the photon mass and the Parameters γ (the Deflection Parameter determined by experimentalists) and ν (the photon frequency) is found by judiciously combining General Relativity and Massive QED. By adopting this scenario and by considering as inputs the most recent measurements of the solar gravitational Deflection of radio waves obtained by means of the Very Long Baseline Interferometry, gravitational upper bounds on the photon mass are estimated.

  • Photon Mass and Very Long Baseline Interferometry
    International Journal of Modern Physics D, 2010
    Co-Authors: Antonio Accioly, Jose Helayel-neto, Eslley Scatena
    Abstract:

    A relation between the photon mass, its frequency, ν, and the Deflection Parameter, γ, determined by experimentalists (that characterizes the contribution of space curvature to gravitational Deflection) is found. This amazing result allows us to conclude that the knowledge of the Parameters ν and γ is all we need to set up gravitational bounds on the photon mass. By considering as inputs the most recent measurements of the solar gravitational Deflection of radio waves obtained via the Very Long Baseline Interferometry, upper bounds on the photon mass are estimated.