The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform

R. F. Wagenbrunn - One of the best experts on this subject based on the ideXlab platform.

  • extended Goldstone Boson exchange constituent quark model
    arXiv: Nuclear Theory, 2004
    Co-Authors: K Glantschnig, W Plessas, R Kainhofer, B Sengl, R. F. Wagenbrunn
    Abstract:

    We present an extension of the Goldstone-Boson-exchange constituent quark model including additional interactions beyond the ones used hitherto. For the hyperfine interaction between the constituent quarks we assume pseudoscalar, vector, and scalar meson exchanges and consider all relevant force components produced by these types of exchanges. The resulting model, which corresponds to a relativistic Poincare-invariant Hamiltonian (or equivalently mass operator), provides a unified framework for a covariant description of all light and strange baryons. The ground states and resonances up to an excitation energy of about 2 GeV are reproduced in fair agreement with phenomenology, with the exception of the first excitations above the Lambda and Xi ground states.

  • covariant nucleon electromagnetic form factors from the Goldstone Boson exchange quark model
    Physics Letters B, 2001
    Co-Authors: R. F. Wagenbrunn, S. Boffi, William H. Klink, W Plessas, Marco Radici
    Abstract:

    Abstract We present a study of proton and neutron electromagnetic form factors for the recently proposed Goldstone-Boson-exchange constituent quark model. Results for charge radii, magnetic moments, and electric as well as magnetic form factors are reported. The calculations are performed in a covariant framework using the point-form approach to relativistic quantum mechanics. All the predictions by the Goldstone-Boson-exchange constituent quark model are found to fall remarkably close to existing experimental data.

  • Covariant nucleon electromagnetic form factors from the Goldstone-Boson-exchange quark model
    Physics Letters B, 2001
    Co-Authors: R. F. Wagenbrunn, Willibald Plessas, S. Boffi, William H. Klink, Marco Radici
    Abstract:

    We present a study of proton and neutron electromagnetic form factors for the recently proposed Goldstone-Boson-exchange constituent quark model. Results for charge radii, magnetic moments, and electric as well as magnetic form factors are reported. The calculations are performed in a covariant framework using the point-form approach to relativistic quantum mechanics. All the predictions by the Goldstone-Boson-exchange constituent quark model are found in remarkably good agreement with existing experimental data.

  • Hadronic decays of N and $\Delta$ resonances in a chiral quark model
    European Physical Journal A, 2001
    Co-Authors: L. Theussl, R. F. Wagenbrunn, B. Desplanques, W Plessas
    Abstract:

    pi and \eta decay modes of light baryon resonances are investigated within a chiral quark model whose hyperfine interaction is based on Goldstone-Boson exchange. For the decay mechanism a modified version of the 3P0 model is employed. Our primary aim is to provide a further test of the recently proposed Goldstone-Boson-exchange constituent quark model. We compare the predictions for \pi and \eta decay widths with experiment and also with results from a traditional one-gluon-exchange constituent quark model. The differences between nonrelativistic and semirelativistic versions of the constituent quark models are outlined. We also discuss the sensitivity of the results on the parametrization of the meson wave function entering the 3P0 model.

  • hadronic decays of baryon resonances in the Goldstone Boson exchange constituent quark model
    1999
    Co-Authors: W Plessas, A Krassnigg, L Theusl, Kalman Varga, R. F. Wagenbrunn
    Abstract:

    The recently proposed semirelativistic constituent-quark model whose hyperfine interaction relies on Goldstone-Boson-exchange dynamics is applied to study hadronic decays of light and strange baryon resonances. Three-quark wave functions produced with the stochastic variational method are used to calculate partial decay widths of π and η decays within the elementary emission model.

Hidenori S Fukano - One of the best experts on this subject based on the ideXlab platform.

  • top mode pseudo nambu Goldstone Boson higgs model
    International Journal of Modern Physics A, 2017
    Co-Authors: Hidenori S Fukano
    Abstract:

    We discuss the Top-Mode pseudo-Nambu–Goldstone Boson Higgs (TMpNGBH) model which has recently been proposed as a variant of the top quark condensate model in light of the 125 GeV Higgs Boson discovered at the LHC. In this talk, we focus on the vacuum alignment and the phenomenologies of characteristic particles of the TMpNGBH model.

  • vacuum alignment of the top mode pseudo nambu Goldstone Boson higgs model
    Physical Review D, 2015
    Co-Authors: Hidenori S Fukano, Masafumi Kurachi, Shinya Matsuzaki
    Abstract:

    We study the vacuum alignment of the top-mode pseudo-Nambu-Goldstone Boson Higgs (TMpNGBH) model, which has recently been proposed as a variant of the top quark condensate model in light of the 126 GeV Higgs Boson discovered at the LHC. It is shown that the vacuum of the model, determined from the one-loop effective potential with all the explicit breaking effects included, realizes the electroweak symmetry breaking with the appropriate breaking scale. Phenomenologies of two characteristic particles in the TMpNGBH model, namely the CP-odd partner of the Higgs and the vectorlike partner of the top quark are also studied based on the newly identified vacuum.

  • higgs Boson as a top mode pseudo nambu Goldstone Boson
    Physical Review D, 2014
    Co-Authors: Hidenori S Fukano, Masafumi Kurachi, Shinya Matsuzaki, Koichi Yamawaki
    Abstract:

    In the spirit of the top quark condensation, we propose a model which has a naturally light composite Higgs Boson, "tHiggs", to be identified with the 126 GeV Higgs discovered at the LHC. The tHiggs, a bound state of the top quark and its flavor (vector-like) partner, emerges as a pseudo Nambu-Goldstone Boson (NGB), "Top-Mode Pseudo", together with the exact NGBs to be absorbed into the W and Z Bosons as well as another (heavier) Top-Mode Pseudo (CP-odd composite scalar). Those five composite (exact/pseudo) NGBs are dynamically produced simultaneously by a single supercritical four-fermion interaction having U(3) x U(1) symmetry which includes the electroweak symmetry, where the vacuum is aligned by small explicit breaking term so as to break the symmetry down to a subgroup, U(2) x U(1)', in a way not to retain the electroweak symmetry, in sharp contrast to the little Higgs models. The explicit breaking term for the vacuum alignment gives rise to a mass of the tHiggs, which is protected by the symmetry and hence naturally controlled against radiative corrections. Realistic top quark mass is easily realized similarly to the top-seesaw mechanism by introducing an extra (subcritical) four-fermion coupling which explicitly breaks the residual U(2) x U(1)' symmetry. We present a phenomenological Lagrangian of the Top-Mode Pseudos along with the standard model particles, which will be useful for the study of the collider phenomenology. The coupling property of the tHiggs is shown to be consistent with the currently available data reported from the LHC. Several phenomenological consequences and constraints from experiments are also addressed.

Shinya Matsuzaki - One of the best experts on this subject based on the ideXlab platform.

  • vacuum alignment of the top mode pseudo nambu Goldstone Boson higgs model
    Physical Review D, 2015
    Co-Authors: Hidenori S Fukano, Masafumi Kurachi, Shinya Matsuzaki
    Abstract:

    We study the vacuum alignment of the top-mode pseudo-Nambu-Goldstone Boson Higgs (TMpNGBH) model, which has recently been proposed as a variant of the top quark condensate model in light of the 126 GeV Higgs Boson discovered at the LHC. It is shown that the vacuum of the model, determined from the one-loop effective potential with all the explicit breaking effects included, realizes the electroweak symmetry breaking with the appropriate breaking scale. Phenomenologies of two characteristic particles in the TMpNGBH model, namely the CP-odd partner of the Higgs and the vectorlike partner of the top quark are also studied based on the newly identified vacuum.

  • higgs Boson as a top mode pseudo nambu Goldstone Boson
    Physical Review D, 2014
    Co-Authors: Hidenori S Fukano, Masafumi Kurachi, Shinya Matsuzaki, Koichi Yamawaki
    Abstract:

    In the spirit of the top quark condensation, we propose a model which has a naturally light composite Higgs Boson, "tHiggs", to be identified with the 126 GeV Higgs discovered at the LHC. The tHiggs, a bound state of the top quark and its flavor (vector-like) partner, emerges as a pseudo Nambu-Goldstone Boson (NGB), "Top-Mode Pseudo", together with the exact NGBs to be absorbed into the W and Z Bosons as well as another (heavier) Top-Mode Pseudo (CP-odd composite scalar). Those five composite (exact/pseudo) NGBs are dynamically produced simultaneously by a single supercritical four-fermion interaction having U(3) x U(1) symmetry which includes the electroweak symmetry, where the vacuum is aligned by small explicit breaking term so as to break the symmetry down to a subgroup, U(2) x U(1)', in a way not to retain the electroweak symmetry, in sharp contrast to the little Higgs models. The explicit breaking term for the vacuum alignment gives rise to a mass of the tHiggs, which is protected by the symmetry and hence naturally controlled against radiative corrections. Realistic top quark mass is easily realized similarly to the top-seesaw mechanism by introducing an extra (subcritical) four-fermion coupling which explicitly breaks the residual U(2) x U(1)' symmetry. We present a phenomenological Lagrangian of the Top-Mode Pseudos along with the standard model particles, which will be useful for the study of the collider phenomenology. The coupling property of the tHiggs is shown to be consistent with the currently available data reported from the LHC. Several phenomenological consequences and constraints from experiments are also addressed.

C Pittori - One of the best experts on this subject based on the ideXlab platform.

W Plessas - One of the best experts on this subject based on the ideXlab platform.

  • extended Goldstone Boson exchange constituent quark model
    arXiv: Nuclear Theory, 2004
    Co-Authors: K Glantschnig, W Plessas, R Kainhofer, B Sengl, R. F. Wagenbrunn
    Abstract:

    We present an extension of the Goldstone-Boson-exchange constituent quark model including additional interactions beyond the ones used hitherto. For the hyperfine interaction between the constituent quarks we assume pseudoscalar, vector, and scalar meson exchanges and consider all relevant force components produced by these types of exchanges. The resulting model, which corresponds to a relativistic Poincare-invariant Hamiltonian (or equivalently mass operator), provides a unified framework for a covariant description of all light and strange baryons. The ground states and resonances up to an excitation energy of about 2 GeV are reproduced in fair agreement with phenomenology, with the exception of the first excitations above the Lambda and Xi ground states.

  • covariant nucleon electromagnetic form factors from the Goldstone Boson exchange quark model
    Physics Letters B, 2001
    Co-Authors: R. F. Wagenbrunn, S. Boffi, William H. Klink, W Plessas, Marco Radici
    Abstract:

    Abstract We present a study of proton and neutron electromagnetic form factors for the recently proposed Goldstone-Boson-exchange constituent quark model. Results for charge radii, magnetic moments, and electric as well as magnetic form factors are reported. The calculations are performed in a covariant framework using the point-form approach to relativistic quantum mechanics. All the predictions by the Goldstone-Boson-exchange constituent quark model are found to fall remarkably close to existing experimental data.

  • Hadronic decays of N and $\Delta$ resonances in a chiral quark model
    European Physical Journal A, 2001
    Co-Authors: L. Theussl, R. F. Wagenbrunn, B. Desplanques, W Plessas
    Abstract:

    pi and \eta decay modes of light baryon resonances are investigated within a chiral quark model whose hyperfine interaction is based on Goldstone-Boson exchange. For the decay mechanism a modified version of the 3P0 model is employed. Our primary aim is to provide a further test of the recently proposed Goldstone-Boson-exchange constituent quark model. We compare the predictions for \pi and \eta decay widths with experiment and also with results from a traditional one-gluon-exchange constituent quark model. The differences between nonrelativistic and semirelativistic versions of the constituent quark models are outlined. We also discuss the sensitivity of the results on the parametrization of the meson wave function entering the 3P0 model.

  • hadronic decays of baryon resonances in the Goldstone Boson exchange constituent quark model
    1999
    Co-Authors: W Plessas, A Krassnigg, L Theusl, Kalman Varga, R. F. Wagenbrunn
    Abstract:

    The recently proposed semirelativistic constituent-quark model whose hyperfine interaction relies on Goldstone-Boson-exchange dynamics is applied to study hadronic decays of light and strange baryon resonances. Three-quark wave functions produced with the stochastic variational method are used to calculate partial decay widths of π and η decays within the elementary emission model.

  • light and strange baryons in a chiral quark model with Goldstone Boson exchange interactions
    Nuclear Physics, 1998
    Co-Authors: Ya L Glozman, Kalman Varga, W Plessas, R. F. Wagenbrunn
    Abstract:

    Abstract We report results for the ground-state and excitation spectra of the light and strange baryons from a semirelativistic constituent quark model that relies on a chiral interaction derived from Goldstone-Boson exchange; in addition a confinement potential of linear form is employed. The three-quark system is solved by means of the stochastic variational method. It is shown that a unified description of all light- and strange-baryon spectra can be achieved in close agreement to phenomenology.